Characteristics of neodymium magnets | Ural Magnit
Earlier in the article Properties of neodymium magnets, the question was addressed - which magnet is right for you and the main properties of neodymium magnets were considered. In this article we will look at the main characteristics of neodymium magnets in more detail, and also talk about how to compare the strength of magnets.
Let's see what the main characteristics of neodymium magnets consist of:
- Residual magnetic induction is the magnetization that remains after magnetization of the material from which our magnet is made, measured on its surface, in a closed system.
- Coercive force is the value of the magnetic field strength required to completely demagnetize the substance from which the magnet is made. The SI unit of measurement is Ampere/meter. The greater the coercive force a magnet has, the more resistant it is to demagnetizing factors.
- Magnetic energy - this parameter determines the main characteristic of a Neodymium magnet. Very often, this quantity is called “magnetic strength”
For ease of understanding, we have summarized all the data in a table. We presented all numerical values in two units of measurement.
The first, without brackets, is the measurement value in the SI system (this system is adopted in Russia), and the second (in brackets) is the measurement unit in the international CGSE system (European standards). For greater convenience, we decided to indicate both values in the table.
Table - main properties and characteristics of neodymium magnets:
Magnet classResidual magnetic induction, milliTesla (KiloGauss)Coercive force, KiloAmpere/meter (KiloOersted)Magnetic energy, kiloJoule/m3 (MegaGauss-Oersted)Operating temperature, degrees Celsius| N35 | 1170-1220 (11,7-12,2) | ≥955 (≥12) | 263-287 (33-36) | 80 |
| N38 | 1220-1250 (12,2-12,5) | ≥955 (≥12) | 287-310 (36-39) | 80 |
| N40 | 1250-1280 (12,5-12,8) | ≥955 (≥12) | 302-326 (38-41) | 80 |
| N42 | 1280-1320 (12,8-13,2) | ≥955 (≥12) | 318-342 (40-43) | 80 |
| N45 | 1320-1380 (13,2-13,8) | ≥955 (≥12) | 342-366 (43-46) | 80 |
| N48 | 1380-1420 (13,8-14,2) | ≥876 (≥12) | 366-390 (46-49) | 80 |
| N50 | 1400-1450 (14,0-14,5) | ≥876 (≥11) | 382-406 (48-51) | 80 |
| N52 | 1430-1480 (14,3-14,8) | ≥876 (≥11) | 398-422 (50-53) | 80 |
| 33M | 1130-1170 (11,3-11,7) | ≥1114 (≥14) | 247-263 (31-33) | 100 |
| 35M | 1170-1220 (11,7-12,2) | ≥1114 (≥14) | 263-287 (33-36) | 100 |
| 38M | 1220-1250 (12,2-12,5) | ≥1114 (≥14) | 287-310 (36-39) | 100 |
| 40M | 1250-1280 (12,5-12,8) | ≥1114 (≥14) | 302-326 (38-41) | 100 |
| 42M | 1280-1320 (12,8-13,2) | ≥1114 (≥14) | 318-342 (40-43) | 100 |
| 45M | 1320-1380 (13,2-13,8) | ≥1114 (≥14) | 342-366 (43-46) | 100 |
| 48M | 1380-1420 (13,8-14,3) | ≥1114 (≥14) | 366-390 (46-49) | 100 |
| 50M | 1400-1450 (14,0-14,5) | ≥1114 (≥14) | 382-406 (48-51) | 100 |
| 30H | 1080-1130 (10,8-11,3) | ≥1353 (≥17) | 223-247 (28-31) | 120 |
| 33H | 1130-1170 (11,3-11,7) | ≥1353 (≥17) | 247-271 (31-34) | 120 |
| 35H | 1170-1220 (11,7-12,2) | ≥1353 (≥17) | 263-287 (33-36) | 120 |
| 38H | 1220-1250 (12,2-12,5) | ≥1353 (≥17) | 287-310 (36-39) | 120 |
| 40H | 1250-1280 (12,5-12,8) | ≥1353 (≥17) | 302-326 (38-41) | 120 |
| 42H | 1280-1320 (12,8-13,2) | ≥1353 (≥17) | 318-342 (40-43) | 120 |
| 45H | 1320-1380 (13,2-13,8) | ≥1353 (≥17) | 326-358 (43-46) | 120 |
| 48H | 1380-1420 (13,8-14,3) | ≥1353 (≥17) | 366-390 (46-49) | 120 |
| 30SH | 1080-1130 (10,8-11,3) | ≥1592 (≥20) | 233-247 (28-31) | 150 |
| 33SH | 1130-1170 (11,3-11,7) | ≥1592 (≥20) | 247-271 (31-34) | 150 |
| 35SH | 1170-1220 (11,7-12,2) | ≥1592 (≥20) | 263-287 (33-36) | 150 |
| 38SH | 1220-1250 (12,2-12,5) | ≥1592 (≥20) | 287-310 (36-39) | 150 |
| 40SH | 1240-1280 (12,4-12,8) | ≥1592 (≥20) | 302-326 (38-41) | 150 |
| 42SH | 1280-1320 (12,8-13,2) | ≥1592 (≥20) | 318-342 (40-43) | 150 |
| 45SH | 1320-1380 (13,2-13,8) | ≥1592 (≥20) | 342-366 (43-46) | 150 |
| 28UH | 1020-1080 (10,2-10,8) | ≥1990 (≥25) | 207-231 (26-29) | 180 |
| 30UH | 1080-1130 (10,8-11,3) | ≥1990 (≥25) | 223-247 (28-31) | 180 |
| 33UH | 1130-1170 (11,3-11,7) | ≥1990 (≥25) | 247-271 (31-34) | 180 |
| 35UH | 1180-1220 (11,7-12,2) | ≥1990 (≥25) | 263-287 (33-36) | 180 |
| 38UH | 1220-1250 (12,2-12,5) | ≥1990 (≥25) | 287-310 (36-39) | 180 |
| 40UH | 1240-1280 (12,4-12,8) | ≥1990 (≥25) | 302-326 (38-41) | 180 |
| 28EH | 1040-1090 (10,4-10,9) | ≥2388 (≥30) | 207-231 (26-29) | 200 |
| 30EH | 1080-1130 (10,8-11,3) | ≥2388 (≥30) | 233-247 (28-31) | 200 |
| 33EH | 1130-1170 (11,3-11,7) | ≥2388 (≥30) | 247-271 (31-34) | 200 |
| 35EH | 1170-1220 (11,7-12,2) | ≥2388 (≥30) | 263-287 (33-36) | 200 |
| 38EH | 1220-1250 (12,2-12,5) | ≥2388 (≥30) | 287-310 (36-39) | 200 |
And finally we come to the question that our clients often ask - how to compare the strength of magnets? In order not to bore the reader with the abundance of information in one material, we decided to devote a separate article to this topic, in which we will fully discuss this issue.
Source: https://magnitural.ru/neodimovye-magnity/harakteristiki-neodimovyh-magnitov.html
Neodymium magnets: properties and areas of use
08.08.2017 6696
Neodymium magnets are widely used in various fields. This is achieved thanks to its unique characteristics and affordable cost. What are the advantages of these alloys? Where are they used?
Main characteristics of neodymium magnets
People noticed the ability of metal products to magnetize a long time ago. Over the years, craftsmen have learned to create alloys that can provide invaluable assistance in everyday life, production, and the scientific field. These inventions include neodymium magnets. They are produced on the basis of neodymium, iron and boron. A feature of such products is a high magnetizing force with small dimensions. In addition, such devices have the following advantages:
- resistance to demagnetization over a long period (no more than 1% for 10 years);
- preservation of properties under significant mechanical influences, vibrations, shocks;
- ability to withstand high and low temperatures;
- resistance to oxidation;
- low price.
There are different sizes of these products. The most popular is a 50x30 neodymium magnet, which has an adhesive force of 100-120 kg.
Main areas of use of neodymium alloys
The magnets in question are actively used in the economic sphere. They help solve a lot of problems of varying degrees of complexity. Products available:
- At home. In everyday life, neodymium bracelets are used to search for small-sized metal products, create fastenings for knives, accessories, needles, wash windows, etc.
- In the automotive industry. Vehicle owners actively use the properties of neodymium alloys to clean engine and transmission oils. These devices facilitate the rapid removal of metal suspensions, which significantly increases the service life of the vehicle.
- In production. Magnets with high adhesive force are indispensable in the manufacture of souvenirs, toys, and accessories. They are used to create rivets on pockets, bags, and wardrobe items.
- In medicine and science. The devices in question play an important role in research activities, experiments on various materials and finished products.
- In the entertainment industry. Magnets are used here for magic tricks and exciting shows.
Source: https://mos.news/blog/neodimovye-magnity-svoystva-i-sfery-ispolzovaniya/
Neodymium magnets n45 n52 and neodymium magnet n42 - characteristics properties price application of permanent magnets
Neodymium magnet n52 (made of NdFeB material) is produced according to the manufacturer’s own Technical Conditions (TS). GOST for permanent magnets made of neodymium has not yet been adopted, although a draft of this document already exists. According to the direction of the magnetic field (magnetization vector), magnets are divided into:
axial magnet, diametrical magnet, radial magnet.
Magnetic field direction
| Axial | Diametral | Radial |
| Along the thickness | Along the diameter | To the center of the radius |
| (size h) | (size D) | (size r) |
Physical characteristics of a neodymium magnet made of NdFeB (Neodymium-Iron-Boron) material
- Material density: ~ 7.4 (g/cm3.)
- Curie temperature: 310 – 340 (C0)
- Vickers hardness: ~600 (Hv)
- Electrical resistance: 140 – 145 (Ohm cm) (Electrically conductive)
For the convenience of selecting neodymium magnets according to the required magnetic characteristics, we present a summary table (magnetic properties are tied to the grade of material).
Magnetic properties of sintered magnets (NdFeb)
| Class | Residual magnetic induction, milliTesla (KiloGauss) | Coercive force, KiloAmpere/meter (KiloOersted) | Magnetic energy, kiloJoule/m3 (MegaGauss-Oersted) | Operating temperature, degrees Celsius |
| N35 | 1170-1220 (11,7-12,2) | ≥955 (≥12) | 263-287 (33-36) | 80 |
| N38 | 1220-1250 (12,2-12,5) | ≥955 (≥12) | 287-310 (36-39) | 80 |
| N40 | 1250-1280 (12,5-12,8) | ≥955 (≥12) | 302-326 (38-41) | 80 |
| N42 | 1280-1320 (12,8-13,2) | ≥955 (≥12) | 318-342 (40-43) | 80 |
| N45 | 1320-1380 (13,2-13,8) | ≥955 (≥12) | 342-366 (43-46) | 80 |
| N48 | 1380-1420 (13,8-14,2) | ≥876 (≥12) | 366-390 (46-49) | 80 |
| N50 | 1400-1450 (14,0-14,5) | ≥876 (≥11) | 382-406 (48-51) | 80 |
| N52 | 1430-1480 (14,3-14,8) | ≥876 (≥11) | 398-422 (50-53) | 80 |
| 33M | 1130-1170 (11,3-11,7) | ≥1114 (≥14) | 247-263 (31-33) | 100 |
| 35M | 1170-1220 (11,7-12,2) | ≥1114 (≥14) | 263-287 (33-36) | 100 |
| 38M | 1220-1250 (12,2-12,5) | ≥1114 (≥14) | 287-310 (36-39) | 100 |
| 40M | 1250-1280 (12,5-12,8) | ≥1114 (≥14) | 302-326 (38-41) | 100 |
| 42M | 1280-1320 (12,8-13,2) | ≥1114 (≥14) | 318-342 (40-43) | 100 |
| 45M | 1320-1380 (13,2-13,8) | ≥1114 (≥14) | 342-366 (43-46) | 100 |
| 48M | 1380-1420 (13,8-14,3) | ≥1114 (≥14) | 366-390 (46-49) | 100 |
| 50M | 1400-1450 (14,0-14,5) | ≥1114 (≥14) | 382-406 (48-51) | 100 |
| 30H | 1080-1130 (10,8-11,3) | ≥1353 (≥17) | 223-247 (28-31) | 120 |
| 33H | 1130-1170 (11,3-11,7) | ≥1353 (≥17) | 247-271 (31-34) | 120 |
| 35H | 1170-1220 (11,7-12,2) | ≥1353 (≥17) | 263-287 (33-36) | 120 |
| 38H | 1220-1250 (12,2-12,5) | ≥1353 (≥17) | 287-310 (36-39) | 120 |
| 40H | 1250-1280 (12,5-12,8) | ≥1353 (≥17) | 302-326 (38-41) | 120 |
| 42H | 1280-1320 (12,8-13,2) | ≥1353 (≥17) | 318-342 (40-43) | 120 |
| 45H | 1320-1380 (13,2-13,8) | ≥1353 (≥17) | 326-358 (43-46) | 120 |
| 48H | 1380-1420 (13,8-14,3) | ≥1353 (≥17) | 366-390 (46-49) | 120 |
| 30SH | 1080-1130 (10,8-11,3) | ≥1592 (≥20) | 233-247 (28-31) | 150 |
| 33SH | 1130-1170 (11,3-11,7) | ≥1592 (≥20) | 247-271 (31-34) | 150 |
| 35SH | 1170-1220 (11,7-12,2) | ≥1592 (≥20) | 263-287 (33-36) | 150 |
| 38SH | 1220-1250 (12,2-12,5) | ≥1592 (≥20) | 287-310 (36-39) | 150 |
| 40SH | 1240-1280 (12,4-12,8) | ≥1592 (≥20) | 302-326 (38-41) | 150 |
| 42SH | 1280-1320 (12,8-13,2) | ≥1592 (≥20) | 318-342 (40-43) | 150 |
| 45SH | 1320-1380 (13,2-13,8) | ≥1592 (≥20) | 342-366 (43-46) | 150 |
| 28UH | 1020-1080 (10,2-10,8) | ≥1990 (≥25) | 207-231 (26-29) | 180 |
| 30UH | 1080-1130 (10,8-11,3) | ≥1990 (≥25) | 223-247 (28-31) | 180 |
| 33UH | 1130-1170 (11,3-11,7) | ≥1990 (≥25) | 247-271 (31-34) | 180 |
| 35UH | 1180-1220 (11,7-12,2) | ≥1990 (≥25) | 263-287 (33-36) | 180 |
| 38UH | 1220-1250 (12,2-12,5) | ≥1990 (≥25) | 287-310 (36-39) | 180 |
| 40UH | 1240-1280 (12,4-12,8) | ≥1990 (≥25) | 302-326 (38-41) | 180 |
| 28EH | 1040-1090 (10,4-10,9) | ≥2388 (≥30) | 207-231 (26-29) | 200 |
| 30EH | 1080-1130 (10,8-11,3) | ≥2388 (≥30) | 233-247 (28-31) | 200 |
| 33EH | 1130-1170 (11,3-11,7) | ≥2388 (≥30) | 247-271 (31-34) | 200 |
| 35EH | 1170-1220 (11,7-12,2) | ≥2388 (≥30) | 263-287 (33-36) | 200 |
| 38EH | 1220-1250 (12,2-12,5) | ≥2388 (≥30) | 287-310 (36-39) | 200 |
The table shows you a neodymium magnet n42, neodymium magnets n45 and many others. On our website, you are invited to carefully study the entire range in order to choose the ideal one to solve your problems.
We are a manufacturing company and can offer you excellent conditions for all products including n45 neodymium magnets. In addition, we can carry out the manufacturing process to a custom specification, even if you need to make a neodymium n42 magnet that you cannot buy in a retail store.
Cooperation with magnitslon.ru is reliable and profitable; from us you can buy permanent magnets, the price of which is lower than retail.
Special characteristics of the magnet
Neodymium magnet is the most powerful magnet in the world. It is made from neodymium, iron and boron.
The high residual magnetization of the material allows it to be used not only in the creation of technologies, as a load gripper, fixing objects, etc., but also in everyday life, for entertainment, cleaning aquariums, and even for deleting data from a disk.
NdFeB magnets can be different, and when ordering it is important to indicate which magnet you are interested in. To receive the desired product, you need to indicate its item number (class).
Magnet classes differ in magnitude in the SI system and the international SGSE classification. Technical characteristics of a certain class include: remanent magnetic induction, energy, coercivity and operating temperature. It is important to take into account the coercive force if NdFeB is operated near powerful electrical components, since the material may lose its magnetic properties. According to the direction of the magnetic field, there is a division of magnets into ascial, radial, and diametrical divisions.
According to physical characteristics, the magnet has:
- Curie temperature, CO – 310-340;
- Density, g/cm³ – 7.4;
- Vickers hardness, Hv – 600;
- Electrical resistance – 140-145.
A neodymium magnet is capable of conducting electricity. NdFeB does not have high mechanical strength, so it must be packaged securely.
Our company Neodymium Magnet LLC has a modern, powerful production facility and, if necessary, can create magnetic products according to your specifications, as well as neodymium magnet n42 magnets, as well as neodymium magnet n45.
In the product catalog you will find: disk magnets, as well as magnetic holders, balls, cubes, rings, prisms, rods and holders for phones and other devices.
Source: http://magnitslon.ru/blog/harakteristiki-neodimovyh-magnitov
Neodymium magnets
Neodymium magnets. We accept orders for the production and supply of both prototypes and industrial batches of high-quality neodymium magnets (NdFeB magnets).
Neodymium magnets are a type of rare earth magnet, the most powerful magnets among existing magnetic materials.
They are also called NdFeB magnets (or neodymium-iron-boron) because they are composed primarily of neodymium (Nd), iron (Fe) and boron (B). They are a relatively new invention (the first neodymium magnets appeared in the 1980s) and only became available for everyday use in the late 90s.
Widely used in the manufacture of acoustic systems, linear actuators, deep-well pumps, magnetic separators,
Marking
Neodymium magnets are classified by the material from which they are made. The higher the grade (the number following the “N”), the stronger the magnet. The highest level of neodymium magnet currently available is N55.
Any letter following the class refers to the temperature rating of the magnet. If there are no letters after the class, then the magnet is a standard neodymium temperature range.
Standard temperature values (without designation) - M - H - SH - UH - EH can be found in the table below.
Coating
To protect these magnets from corrosion (oxidation of the iron contained in the magnet by oxygen in air or water), they are covered with a protective coating 6-12 microns thick.
The most common coating is nickel plating (to be precise, a triple coating with a layer of nickel, copper and nickel). Other coating options are also practiced - zinc, epoxy resin. More sophisticated coatings include tin, copper, silver and gold.
All our magnet manufacturing plants:
- passed ISO 9001 and ISO/TS 16949 quality management system certification;
- specialize in the production of only neodymium magnets;
- are equipped with modern equipment, which ensures high dimensional accuracy, and not only use advanced magnet production technologies, but are also the developers of these technologies
The magnetic properties and physical characteristics of magnets are listed below.
You can leave a request for the supply of neodymium magnets [email protected] or by calling our office.
The application must include:
- attach a drawing with dimensions (standard shapes and non-standard (acceptable) shapes of magnets);
- indicate the size tolerance (standard tolerance +0.1/-0.1 mm, size tolerance only in minus or only in plus, tolerance as specified by the Customer);
- indicate the brand of magnet (see table Magnetic properties of NdFeB magnets );
- indicate the operating temperature (see table Magnetic properties of NdFeB magnets );
- indicate the direction of magnetization (see directions of magnetization );
- indicate the type of anti-corrosion coating for magnets (Zn, Ni, Ni-Cu-Ni, Cu-Ni, epoxy, other - according to the Customer’s instructions);
- indicate the number of magnets.
The magnetic and physical characteristics of neodymium magnets, as well as the demagnetization curves (BH curve) of each brand of magnets are indicated in the table and in the pdf file.
| Brand | Residual magnetic induction Br, T | Coercive force by induction Hcb, kA/m | Coercive force by magnetization Hcj, kA/m | Max. magnetic energy BH, kJ/m³ | Max. operating temperature, °C | Curie temperature, °C | αBr, %/°C | βHcb, %/°C |
| N30 | 1.08-1.12 | ≥796 | ≥955 | 223-247 | +80 | +310 | -0.12 | -0.60 |
| N33 |
Source: https://ukrms.com.ua/products/postojannye-magnity/tverdye-postojannye-magnity/neodimovye-magnity/
Permanent magnets
> Theory > Permanent magnets
There are two main types of magnets: permanent and electromagnets. You can determine what a permanent magnet is based on its main properties. A permanent magnet gets its name because its magnetism is always “on.” It generates its own magnetic field, unlike an electromagnet, which is made of wire wrapped around an iron core and requires current to flow to create a magnetic field.
History of the study of magnetic properties
Centuries ago, people discovered that some types of rocks have an original property: they are attracted to iron objects. Mention of magnetite is found in ancient historical chronicles: more than two thousand years ago in European and much earlier in East Asian. At first it was regarded as a curious object.
Later, magnetite was used for navigation, finding that it tends to occupy a certain position when given the freedom to rotate. Scientific research carried out by P. Peregrine in the 13th century showed that steel could acquire these characteristics after being rubbed with magnetite.
Magnetized objects had two poles: “north” and “south,” relative to the Earth’s magnetic field. As Peregrine discovered, isolating one of the poles was not possible by cutting a fragment of magnetite in two - each individual fragment ended up with its own pair of poles.
In accordance with today's concepts, the magnetic field of permanent magnets is the resulting orientation of electrons in a single direction. Only some types of materials interact with magnetic fields; a much smaller number of them are capable of maintaining a constant magnetic field.
Properties of permanent magnets
The main properties of permanent magnets and the field they create are:
- the existence of two poles;
- opposite poles attract, and like poles repel (like positive and negative charges);
- magnetic force imperceptibly spreads in space and passes through objects (paper, wood);
- An increase in MF intensity is observed near the poles.
Interaction of magnetic poles
Permanent magnets support the MP without external assistance. Depending on their magnetic properties, materials are divided into main types:
- ferromagnets – easily magnetized;
- paramagnetic materials – are magnetized with great difficulty;
- Diamagnets - tend to reflect external magnetic fields by magnetizing in the opposite direction.
Important! Soft magnetic materials such as steel conduct magnetism when attached to a magnet, but this stops when it is removed. Permanent magnets are made from hard magnetic materials.
How does a permanent magnet work?
His work deals with atomic structure. All ferromagnets create a natural, albeit weak, magnetic field, thanks to the electrons surrounding the nuclei of atoms. These groups of atoms are able to orient themselves in the same direction and are called magnetic domains. Each domain has two poles: north and south. When a ferromagnetic material is not magnetized, its regions are oriented in random directions, and their magnetic fields cancel each other out.
To create permanent magnets, ferromagnets are heated at very high temperatures and exposed to strong external magnetic fields.
This leads to the fact that individual magnetic domains inside the material begin to orient themselves in the direction of the external magnetic field until all domains are aligned, reaching the point of magnetic saturation.
The material is then cooled and the aligned domains are locked into position. Once the external MF is removed, hard magnetic materials will retain most of their domains, creating a permanent magnet.
Production of permanent magnets
Characteristics of permanent magnet
- Magnetic force is characterized by residual magnetic induction. Designated Br. This is the force that remains after the disappearance of the external MP. Measured in tests (T) or gauss (G);
- Coercivity or resistance to demagnetization - Ns. Measured in A/m.
Shows what the external MF intensity should be in order to demagnetize the material;
- Maximum energy – BHmax. Calculated by multiplying the remanent magnetic force Br and coercivity Hc. Measured in MGSE (megaussersted);
- Temperature coefficient of residual magnetic force – Тс of Br.
Characterizes the dependence of Br on the temperature value;
- Tmax – the highest temperature value, upon reaching which permanent magnets lose their properties with the possibility of reverse recovery;
- Tcur is the highest temperature value at which the magnetic material irreversibly loses its properties. This indicator is called the Curie temperature.
Generator with neodymium magnets
Individual magnet characteristics change depending on temperature. At different temperatures, different types of magnetic materials perform differently.
Important! All permanent magnets lose a percentage of their magnetism as the temperature rises, but at different rates depending on their type.
Types of permanent magnets
There are five types of permanent magnets, each of which is manufactured differently using materials with different properties:
- alnico;
- ferrites;
- rare earth SmCo based on cobalt and samarium;
- neodymium;
- polymer.
Alnico
These are permanent magnets consisting primarily of a combination of aluminum, nickel and cobalt, but may also include copper, iron and titanium. Due to the properties of alnico magnets, they can operate at the highest temperatures while retaining their magnetism, but they demagnetize more easily than ferrite or rare earth SmCo. They were the first mass-produced permanent magnets, replacing magnetized metals and expensive electromagnets.
Magnets in electric motors
Application:
- electric motors;
- heat treatment;
- bearings;
- aerospace vehicles;
- military equipment;
- high temperature loading and unloading equipment;
- microphones.
Ferrites
To make ferrite magnets, also known as ceramic, strontium carbonate and iron oxide are used in a ratio of 10/90. Both materials are abundant and economically available.
Due to their low production costs, resistance to heat (up to 250°C) and corrosion, ferrite magnets are one of the most popular magnets for everyday use. They have greater internal coercivity than alnico, but less magnetic strength than their neodymium counterparts.
Application:
- sound speakers;
- security systems;
- large plate magnets for removing iron contamination from process lines;
- electric motors and generators;
- medical instruments;
- lifting magnets;
- marine search magnets;
- devices based on the operation of eddy currents;
- switches and relays;
- brakes
Magnet in sound speaker
Rare Earth SmCo Magnets
Cobalt and samarium magnets operate over a wide temperature range, have high temperature coefficients and high corrosion resistance. This type retains magnetic properties even at temperatures below absolute zero, making them popular for use in cryogenic applications.
Application:
- turbo technology;
- pump couplings;
- wet environments;
- high temperature devices;
- miniature electric racing cars;
- radio-electronic devices for operation in critical conditions.
Neodymium magnets
The strongest existing magnets, consisting of an alloy of neodymium, iron and boron. Thanks to their enormous power, even miniature magnets are effective. This provides versatility of use.
Each person is constantly near one of the neodymium magnets. They are, for example, in a smartphone. The manufacture of electric motors, medical equipment, and radio electronics rely on ultra-strong neodymium magnets.
Due to their ultra-strength, enormous magnetic force and resistance to demagnetization, samples up to 1 mm are possible.
Neodymium magnets of different shapes
Application:
- hard disks;
- sound-reproducing devices – microphones, acoustic sensors, headphones, loudspeakers;
- prostheses;
- magnetically coupled pumps;
- door closers;
- engines and generators;
- locks on jewelry;
- MRI scanners;
- magnetic therapy;
- ABS sensors in cars;
- lifting equipment;
- magnetic separators;
- reed switches, etc.
Polymer magnets
Flexible magnets contain magnetic particles inside a polymer binder. Used for unique devices where installation of solid analogues is impossible.
Application:
- display advertising – quick fixation and quick removal at exhibitions and events;
- vehicle signs, educational school panels, company logos;
- toys, puzzles and games;
- masking surfaces for painting;
- calendars and magnetic bookmarks;
- window and door seals.
Most permanent magnets are brittle and should not be used as structural components. They are made in standard forms: rings, rods, disks, and individual: trapezoids, arcs, etc. Neodymium magnets, due to their high iron content, are susceptible to corrosion, so they are coated with nickel, stainless steel, Teflon, titanium, rubber and other materials.
Source: https://jelectro.ru/teoriya/postoyannye-magnity.html
Characteristics of neodymium magnets
We wrote this article to answer the question about classes of magnets, their standards, and physical characteristics.
Despite the fact that the magnets we offer are called neodymium, they can be very different from each other, because each magnet has its own physical characteristics, not just size, shape and coating. Therefore, the question of which neodymium magnets are of interest to you should not confuse you. In this article you will get answers to many of your questions.
What do the letters and numbers mean in the classes of neodymium magnets?
Often, we, as manufacturers and sellers, want to hear the technical characteristics of the magnet, namely the letters and numbers in which they (the technical characteristics) are encrypted.
And the buyer often thoroughly knows his field of application of magnets, but does not know the nomenclature, especially the international one. So, let's begin to understand the international nomenclature of magnets, namely classes, technical characteristics and designations.
First of all, neodymium magnets are divided into classes, which are designated by letters and numbers (for example, N35), which contain basic information about the magnet. Below is a standard nomenclature table of characteristics of neodymium magnets (look in the left column - the classes are indicated there).
In the table, we presented all numerical values in two units of measurement. The first, without brackets, is the measurement value in the SI system (this is the system in which our country operates), and the second (indicated in brackets) is the measurement in the international CGSE system (European standards). For your convenience, we decided to indicate both units of measurement in the table.
Neodymium magnet characteristics table
We begin to study the table from right to left. As you can see from the right column of the table, the main class difference between magnets is their operating temperature of use, that is, the permissible maximum temperature, above which the magnet begins to lose its magnetic properties. Thus, the temperature range of use of the magnet is indicated by the letter part of its marking (left column). Let's decipher these letters:
- Magnets brand N (Normal) – can be used at normal temperatures, that is, up to 80 degrees Celsius;
- Magnets brand M (Medium) – can be used at elevated temperatures, that is, up to 100 degrees Celsius;
- Magnets of grade H (High) – can be used at high temperatures, up to 120 degrees Celsius;
- SH (Super High) magnets
- Magnets of the UH (Ultra High) brand – can be used at temperatures up to 180 degrees Celsius;
- Magnets brand EH (Extra High) - can be used at temperatures up to 200 degrees Celsius.
It is worth mentioning that negative temperatures do not affect the magnetic properties of most magnets.
The numbers indicated in the magnet class designation: N30, 33M, 35H, 38SH, 40UH, etc., indicate Magnetic Energy (fourth column of the table), measured in kiloJoules per cubic meter.
This criterion of magnets is responsible for their power or the so-called “tearing force,” that is, the force that must be applied to the magnet in order to “tear” it from the surface. It is necessary to understand that the surface (steel sheet) must be perfectly flat, and the applied force must be perpendicular to the sheet.
These are the so-called ideal or theoretical conditions. It is absolutely clear that the higher the digital designation of the magnet, the higher its pull-out force.
Magnet pull-out force
But, in addition, the “pull force” depends not only on the physical characteristics of the magnet, but also on its size and weight. For example, a 25*20 mm magnet is easier to tear off a steel sheet than a 40*5 mm magnet, since the contact area of the second magnet is larger (25 mm versus 40 mm). But the magnetic field lines, if visualized, extend “further” at the first magnet (25*20 mm), which means it “clings” to the steel sheet better.
| Class | Residual magnetic induction, milliTesla (KiloGauss) | Coercive force, KiloAmpere/meter (KiloOersted) | Magnetic energy, kiloJoule/m3 (MegaGauss-Oersted) | Operating temperature, degrees Celsius |
| N35 | 1170-1220 (11,7-12,2) | ≥955 (≥12) | 263-287 (33-36) | 80 |
| N38 | 1220-1250 (12,2-12,5) | ≥955 (≥12) | 287-310 (36-39) | 80 |
| N40 | 1250-1280 (12,5-12,8) | ≥955 (≥12) | 302-326 (38-41) | 80 |
| N42 | 1280-1320 (12,8-13,2) | ≥955 (≥12) | 318-342 (40-43) | 80 |
| N45 | 1320-1380 (13,2-13,8) | ≥955 (≥12) | 342-366 (43-46) | 80 |
| N48 | 1380-1420 (13,8-14,2) | ≥876 (≥12) | 366-390 (46-49) | 80 |
| N50 | 1400-1450 (14,0-14,5) | ≥876 (≥11) | 382-406 (48-51) | 80 |
| N52 | 1430-1480 (14,3-14,8) | ≥876 (≥11) | 398-422 (50-53) | 80 |
| 33M | 1130-1170 (11,3-11,7) | ≥1114 (≥14) | 247-263 (31-33) | 100 |
| 35M | 1170-1220 (11,7-12,2) | ≥1114 (≥14) | 263-287 (33-36) | 100 |
| 38M | 1220-1250 (12,2-12,5) | ≥1114 (≥14) | 287-310 (36-39) | 100 |
| 40M | 1250-1280 (12,5-12,8) | ≥1114 (≥14) | 302-326 (38-41) | 100 |
| 42M | 1280-1320 (12,8-13,2) | ≥1114 (≥14) | 318-342 (40-43) | 100 |
| 45M | 1320-1380 (13,2-13,8) | ≥1114 (≥14) | 342-366 (43-46) | 100 |
| 48M | 1380-1420 (13,8-14,3) | ≥1114 (≥14) | 366-390 (46-49) | 100 |
| 50M | 1400-1450 (14,0-14,5) | ≥1114 (≥14) | 382-406 (48-51) | 100 |
| 30H | 1080-1130 (10,8-11,3) | ≥1353 (≥17) | 223-247 (28-31) | 120 |
| 33H | 1130-1170 (11,3-11,7) | ≥1353 (≥17) | 247-271 (31-34) | 120 |
| 35H | 1170-1220 (11,7-12,2) | ≥1353 (≥17) | 263-287 (33-36) | 120 |
| 38H | 1220-1250 (12,2-12,5) | ≥1353 (≥17) | 287-310 (36-39) | 120 |
| 40H | 1250-1280 (12,5-12,8) | ≥1353 (≥17) | 302-326 (38-41) | 120 |
| 42H | 1280-1320 (12,8-13,2) | ≥1353 (≥17) | 318-342 (40-43) | 120 |
| 45H | 1320-1380 (13,2-13,8) | ≥1353 (≥17) | 326-358 (43-46) | 120 |
| 48H | 1380-1420 (13,8-14,3) | ≥1353 (≥17) | 366-390 (46-49) | 120 |
| 30SH | 1080-1130 (10,8-11,3) | ≥1592 (≥20) | 233-247 (28-31) | 150 |
| 33SH | 1130-1170 (11,3-11,7) | ≥1592 (≥20) | 247-271 (31-34) | 150 |
| 35SH | 1170-1220 (11,7-12,2) | ≥1592 (≥20) | 263-287 (33-36) | 150 |
| 38SH | 1220-1250 (12,2-12,5) | ≥1592 (≥20) | 287-310 (36-39) | 150 |
| 40SH | 1240-1280 (12,4-12,8) | ≥1592 (≥20) | 302-326 (38-41) | 150 |
| 42SH | 1280-1320 (12,8-13,2) | ≥1592 (≥20) | 318-342 (40-43) | 150 |
| 45SH | 1320-1380 (13,2-13,8) | ≥1592 (≥20) | 342-366 (43-46) | 150 |
| 28UH | 1020-1080 (10,2-10,8) | ≥1990 (≥25) | 207-231 (26-29) | 180 |
| 30UH | 1080-1130 (10,8-11,3) | ≥1990 (≥25) | 223-247 (28-31) | 180 |
| 33UH | 1130-1170 (11,3-11,7) | ≥1990 (≥25) | 247-271 (31-34) | 180 |
| 35UH | 1180-1220 (11,7-12,2) | ≥1990 (≥25) | 263-287 (33-36) | 180 |
| 38UH | 1220-1250 (12,2-12,5) | ≥1990 (≥25) | 287-310 (36-39) | 180 |
| 40UH | 1240-1280 (12,4-12,8) | ≥1990 (≥25) | 302-326 (38-41) | 180 |
| 28EH | 1040-1090 (10,4-10,9) | ≥2388 (≥30) | 207-231 (26-29) | 200 |
| 30EH | 1080-1130 (10,8-11,3) | ≥2388 (≥30) | 233-247 (28-31) | 200 |
| 33EH | 1130-1170 (11,3-11,7) | ≥2388 (≥30) | 247-271 (31-34) | 200 |
| 35EH | 1170-1220 (11,7-12,2) | ≥2388 (≥30) | 263-287 (33-36) | 200 |
| 38EH | 1220-1250 (12,2-12,5) | ≥2388 (≥30) | 287-310 (36-39) | 200 |
How to compare the strength of magnets?
If there is a need to compare which of two selected magnets is stronger, we recommend that you use the following methods.
- With the same linear dimensions (exact method):
To understand how much stronger one magnet is than another, it is necessary to divide the value of the residual magnetic induction of one magnet (second column of the table) by the value of the residual magnetic induction of the other magnet. Example: neodymium magnet N40 with B=1250 mT and neodymium magnet N50 with B=1400 mT, we divide their magnetic inductions and get 1400/1250 = 1.12, that is, the N50 magnet is “stronger” than the N40 magnet by 12%, provided that the linear dimensions of the magnets are the same.
- For different linear dimensions (rough method):
To understand how much stronger one magnet is than another, you need to compare their masses. Example: a 30*10 mm magnet weighs approximately 55 grams, and a 25*20 mm magnet weighs 76 grams. We divide their masses 76/55=1.38, that is, a 25*20 mm magnet is stronger than a 30*10 mm magnet by about 38%, provided that their classes, that is, physical characteristics, are the same.
Magnet coercive force
And there is one unaffected column left in the table - Coercive Force (third column). Briefly, Coercivity is the amount of magnetic field a magnet must be placed in to “demagnetize” it. This value, as a rule, is very important in cases where the magnet is operated in conditions of a strong external magnetic field, as a rule, near powerful electrical components.
We hope that in this article (characteristics of neodymium magnets) you have found answers to some of your questions. We will be happy to answer other questions by phone or email, which are indicated in the contacts.
Source: https://magnit96.com/blog/article/harakteristiki_neodimovyh_magnitov/
Neodymium magnet • en.wikipedgr.com
A neodymium magnet (also known as NdFeB , FEATHER or Neo magnet), the most widely used type of rare earth magnet, is a permanent magnet made from an alloy of neodymium, iron and boron to create a NdFeB quadrangular transparent structure.
Developed in 1982 by General Motors and Sumitomo Specialty Metals, neodymium magnets are the strongest type of permanent magnet commercially available.
They have replaced other types of magnet in many applications in modern products that require strong permanent magnets, such as motors in portable tools, hard drives, and magnetic fasteners.
Description
U
The tetragonal crystal structure of NdFeB has an exceptionally high uniaxial magnetocrystalline anisotropy (Tesla HA~7 -
magnetic field strength H in A/m versus magnetic moment in Am).
This gives the compound the potential to have high coercivity (ie, resistance to being demagnetized). The composition also has a high saturation magnetization ( J ~1.6 T or 16 kg) and typically 1.3 Tesla.
Therefore, since the maximum energy density is proportional to J , this magnetic phase has the potential to store large amounts of magnetic energy ( BH ~ 512 kJ/m or 64 mg Oe).
This property is significantly higher in NdFeB alloys than in samarium cobalt (SmCo) magnets, which was the first type of rare earth magnet to be commercialized. In practice, the magnetic properties of neodymium magnets depend on the alloy composition, microstructure and production technology used.
Story
In 1982, General Motors (GM) and Sumitomo Specialty Metals discovered the composition NdFeB. The research was initially stimulated by the high raw material cost of SmCo permanent magnets that had been developed earlier. GM focused on developing melt-spun nanocrystalline NdFeB magnets, while Sumitomo developed full-density sintered NdFeB magnets.
GM commercialized its inventions of isotropic Neo powder, bonded Neo magnets and related manufacturing processes by founding Magnequench in 1986 (Magnequench has since become part of Neo Materials Technology, Inc., which later merged into Molycorp). The company supplied melt-spun NdFeB powder to magnetic manufacturers stored in bonded warehouses.
Sumitomo Facility became part of Hitachi Corporation, and currently manufactures and licenses other companies to produce NdFeB sintered magnets. Hitachi has more than 600 patents covering neodymium magnets.
Chinese manufacturers have become the dominant force in neodymium magnetic production, based on their control of much of the world's rare earth ore sources.
The United States Department of Energy identified the need to find replacements for rare earth metals in permanent magnet technology and began funding such research. The Energy Advanced Research Projects Authority has sponsored the Rare Earth Alternatives in Critical Technologies (REACT) program to develop alternative materials. In 2011, ARPA-E awarded $31.6 million to fund Rare Earth Replacement projects.
Production
There are two main neodymium magnet production methods:
- Classical powder metallurgy or sintered magnet process
- Fast curing or connected magnet process
Sintered ND magnets are prepared with raw materials melted in a furnace, cast into a mold and cooled to form ingots. The ingots are sprayed and ground; the powder is then sintered into dense blocks. The blocks are then pasteurized, cut to shape, surface treated and magnetized.
As of 2012, 50,000 tons of neodymium magnets are produced officially every year in China, and 80,000 tons in the company-by-company build-up made in 2013. China produces more than 95% of the rare earth elements and produces about 76% of the world's total rare earth magnets.
Un-date-marked magnets stored in bonded warehouses are prepared by melting the rotation of a thin strip of NdFeB alloy. The tape contains randomly oriented NdFeB nanosized grains. This tape is then sprayed into particles mixed with polymer, and either compressed or injected into magnets stored in bonded warehouses.
Bonded magnets offer less flux intensity than sintered magnets, but can be pure shape formed into intricately shaped pieces, as is typical with Halbach arrays or arcs, trapezoids and other shapes and assemblies (eg, Pot Magnets, Separator Wires, and etc.). There are approximately 5,500 tons of bonded Neo magnets produced every year.
In addition, it is possible to hot press to melt the spun nanocrystalline particles into fully dense isotropic magnets, and then break down the forge or back-press them into high-energy anisotropic magnets.
Varieties
Neodymium magnets are classified according to their maximum energy product, which refers to the magnetic flux output per unit volume. Higher values indicate stronger magnets and a range from N35 to N52. Letters following the grade indicate maximum operating temperatures (often the Curie temperature), which range from M (up to 100 degrees Celsius) to A (200 degrees Celsius).
Types of Neodymium magnets:
- N35-N52
- 33M-48M
- 30th - 45th
- 30SH-42SH
- 30UH-35UH
- 28EH-35EH
Magnetic properties
Some important properties used to stand comparison, permanent magnets: remanent magnetism (B), which measures the strength of the magnetic field, coercivity (H) ; a material's resistance to becoming demagnetized, energetic product (BH) , magnetic energy density, and Curie temperature (T) , the temperature at which a material loses its magnetism.
Neodymium magnets have higher remanent magnetism, much higher coercivity and energy product, but often lower the Curie temperature than other types. Neodymium is alloyed with terbium and dysprosium to maintain its magnetic properties at high temperatures. The table below compares the magnetic performance of neodymium magnets with other types of permanent magnets.
Corrosion problems
Sintered NdFeB tends to be vulnerable to corrosion, especially along the grain boundaries of the sintered magnet. This type of corrosion can cause severe deterioration, including crumbling of the magnet into powder of small magnetic particles or scraping of the surface layer.
This vulnerability is addressed in many commercial products by adding a protective coating to prevent exposure to the atmosphere. Nickel plating or two-layer copper nickel plating are standard methods, although sheet metal plating with other metals, or polymer and varnish, protective coatings are also used.
Dangers
The great strength exerted by rare earth magnets creates dangers that are not seen with other types of magnet. Neodymium magnets larger than a few cubic centimeters are strong enough to cause damage to body parts pinched between two magnets, or a magnet and a metal surface, even causing broken bones.
The magnets allowed to get also near each other can hit each other with enough force to chop and destroy fragile material, and flying chips can cause damage.
There have even been cases where small children who swallowed multiple magnets have had their digestive tracts pinched between the magnets, causing injury or death.
Stronger magnetic fields can be harmful to mechanical and electronic devices; They can erase magnetic media such as floppy disks and credit cards, and magnetize clocks and shadow masks of CRT-type monitors at a greater distance than other types of magnet.
Existing Magnet Applications
Neodymium magnets have replaced alnico and ferrite magnets in many countless applications in modern technology where strong permanent magnets are required because their greater strength allows the use of smaller, lighter magnets for a given application. Some examples:
- Main head drives for computer hard drives
- Magnetic resonance imaging (MRI)
- Lifting and the compressor passes
- Synchronous motors
- Spindle and stepper motors
- Electricity holding on
- The engine drives for hybrid cars and electric vehicles. Each Toyota Prius' electric motors require 1 kilogram (2.2 pounds) of neodymium.
- Head drives
- Electrical generators for wind turbines (only those with permanent magnet excitation)
- direct drive wind turbines require c. 600 kg pm of material per megawatt
- turbines using mechanisms require less than pm of material per megawatt
The neodymium content is estimated to be 31% magnetic weight.
New statements
In addition, the greater strength of neodymium magnets has inspired new applications in areas where magnets were not used before, such as magnetic jewelry clips, children's magnetic building sets (and other neodymium magnetic toys) and as part of the closing mechanism of modern parachute sports equipment. They are also the main metal in previously popular toy desk magnets, "Buckyballs", although some retailers have decided not to sell them due to child safety concerns.
The uniformity of strength and magnetic field on neodymium magnets has also opened up new applications in the medical field with the introduction of open magnetic resonance imaging (MRI) scanners used to image the body in radiology departments as an alternative to superconducting magnets, which use a coil of superconducting wire to produce magnetic field.
Neodymium magnets are used as a surgically placed anti-reflux system, which is a group of magnets surgically implanted around the lower esophageal sphincter to treat gastroesophageal reflux disease (GERD).
see also
- Neodymium magnetic toys
- Samarium cobalt magnet
- Transition metal replacements like
NdCoB
External links
- Magnetic Man Cool experiments with magnets
- Geeky Rare Earth Magnets Repel Sharks, Genevieve Radjuski, 15/05/07, wired.com
Source: http://ru.knowledgr.com/00235925/%D0%9D%D0%B5%D0%BE%D0%B4%D0%B8%D0%BC%D0%BE%D0%B2%D1%8B %D0%B9%D0%9C%D0%B0%D0%B3%D0%BD%D0%B8%D1%82
Neodymium magnets - properties and applications
We have all been familiar with the properties of magnets since childhood. Surely most of us, when we were very small, watched in fascination how, in an incomprehensible way, two magnets attract or repel each other. Neodymium magnets appeared relatively recently. They were developed in 1982. It is an alloy of iron and boron with a small addition of the rare earth element neodymium.
Properties of neodymium magnets
Their main property is a very powerful force of attraction. It is tens of times greater than that of conventional ferrite magnets. In addition, the period of complete self-demagnetization can take hundreds of years (demagnetizes by 1% in 10 years). But such magnets must be used carefully. When hit, they may break and lose some of their properties. In addition, it is worth looking carefully at the operating temperature range of the magnet used.
For example, the simplest ones (Mark N) cannot be heated above 70-80 C. Otherwise, magnetism will disappear forever. Neodymium magnets can come in completely different shapes, depending on where they will be used. On the Internet you can now easily buy neodymium magnets, rectangles or any other shape. Moreover, after purchase, the magnet cannot be given any other look. They cannot be processed.
And drilling or cutting in general can cause the magnet to catch fire.
Application
Neodymium magnets are widely used in various industries. In addition to being durable, but at the same time detachable fasteners, they are used to search for metal objects. Moreover, both underground and in various technical liquids or gases. In medicine, they are used in magnetic resonance imaging machines. These magnets can also be found in household items.
With their help, designers manage to make levitating interior items and furniture.
And there are many other places – it would take too long to list all the areas of application. For industrial purposes, of course, it is better to buy neodymium magnets in bulk. The first acquaintance of ordinary people with neodymium magnets occurred after the appearance on the market of construction toys in the form of small balls. You could make amazing “things” out of it.
BUT, a great danger of uncontrolled use in everyday life was immediately revealed.
Precautionary measures
Now you can buy neodymium magnets in Chelyabinsk and Moscow, Sakhalin and Vladivostok. In any city! After the appearance of such magnets on the market, there were cases when a child swallowed small magnet balls. Considering their strength, it is not difficult to imagine what happened to the internal organs then. You need to be extremely careful when handling them.
After all, even small magnets, when connected to each other or metal objects, can crush a human bone! See the video below for an example. You should also keep them away from any household appliances, computers, etc. Strong magnetic waves can damage equipment.
Because of this, by the way, their transportation is carried out only by land transport and each magnet is packed in wooden boxes with a thick layer of polystyrene foam.
Source: https://tltsport.ru/sportpressa/neodimovye-magnity-svojstva-i-primenenie/
Useful properties of neodymium magnets
Magnets have a special attractive force. And sometimes this property of a magnet allows you to attract the necessary metal structures. For example, when catching cargo from a river reservoir. Magnets are useful in any activity.
What magnets are most often found in everyday life? Neodymium magnets can be found in the production of equipment. Moreover, most often they are used for the operation and functioning of computers. Neodymium magnets are widely used in the following fields of activity:
- medical field of activity;
- in military production;
- in factories;
- in the production of accessories for computer equipment
The range of their application is different. However, most often neodymium magnets are used to directly create a magnetic field. It is important in the functioning of mobile phones. A one-sided or two-sided search magnet can be used here.
Creating a Magnetic Field
Mobile phones are used quite often these days. And without a magnetic field, their functioning is not ensured. We also need neodymium magnets in everyday life. They are highly resistant to low temperatures.
The service life of neodymium magnets is quite long. That is, they practically do not lose their properties of attracting parts. These magnets are also used in the domestic sphere. For example, for household appliances.
Neodymium magnets are also widely used in production. For example, when oil equipment becomes clogged. Most often, these magnets do not tolerate the effects of high temperatures, so the risk of exposure to the sun's rays should be reduced.
Neodymium magnets in medicine
How is a magnet used in medicine? In medicine, magnets are useful for instrumental diagnostics. Instrumental diagnostics is associated with the study of the brain.
Agree, medicine plays an important role in our lives. The lack of the required magnetic field leads to a decline in the quality of medical services. For the most severe damage to the nervous system and brain, magnets are most necessary. After all, disease diagnosis is an important technique in detecting pathological processes. This means that the pathological process in the body cannot be cured without comprehensive diagnostics (including MRI).
The properties of a neodymium magnet are most significant during demagnetization. It is almost impossible to demagnetize a powerful neodymium magnet. In addition, its service life is quite long. You can buy a neodymium magnet in Ukraine inexpensively on the Internet. If you need attractive force based on the properties of a magnet, then buy a neodymium magnet!
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Source: https://freesmi.by/raznoe/255104
Properties of neodymium magnets
Neodymium magnet belongs to the rare earth type. In addition to the main substance - neodymium, its composition includes boron and iron. All this is covered with a thin layer of nickel and copper. Note that the alloy used to produce this magnet was discovered by General Motors specialists from Japan in 1982. Six years later, a manufacturing enterprise began operating that specialized in precisely such magnets.
Neodymium magnet began to be produced in the United States of America, China and many other countries. They are chosen for their solid power. In this parameter, such magnets are superior to their “brothers” made of other materials, for example, ceramics or ferrite.
Interesting facts about neodymium magnet
Neodymium magnets currently occupy a leading position in the world in terms of power. Over a decade of continuous use, they can lose only 1% percent of their potential (in other words, the ability to attract and hold other iron objects).
The outer coating is done in order to protect neodymium from oxidation processes. In humid conditions, the magnet quickly loses magnetization and becomes unusable. The quality of each magnet is certainly tested under industrial conditions. Digital measuring equipment allows you to monitor the physical parameters of magnets, while X-ray fluorescence makes it possible to find out how thick the magnet coating is.
Where can neodymium magnets be used?
Neodymium magnets are used mainly in industry, because the nanostructure of the alloy itself has unique properties. It can lift substantial loads. With their help, fuel magnetization and special document processing are carried out.
What properties do neodymium magnets have?
First of all, let's say that neodymium magnets have the highest power in the world. They can easily support enormous weight, approximately 100 times their own weight. Magnets must be used carefully. During operation, neodymium magnets retain their impressive performance parameters. But they cannot be used under severe temperature changes. These types of magnets vary in size. They can lift approximately 10 times their weight.
Source: https://ftimes.ru/press/38189-svojstva-neodimovyx-magnitov.html
