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Classification and main components of neodymium magnets

Author:admin   AddTime:2021-11-08

Neodymium magnets, also called neodymium iron boron magnets, are tetragonal crystals composed of neodymium, iron and boron. The magnetic energy product of neodymium magnets is greater than that of samarium cobalt magnets, and it was the material with very large magnetic energy product in the world at that time. Later, Sumitomo Special Metals successfully developed the powder metallurgy method, and General Motors successfully developed the rotary blow smelting method to produce NdFeB magnets. Neodymium magnets are permanent magnets, second only to holmium magnets with -273° in magnetism, and are also commonly used rare earth magnets. Neodymium magnets are widely used in electronic products, such as hard drives, mobile phones, earphones, battery-powered tools, etc.

In order to avoid corrosion damage, the surface of the permanent magnet material needs to be protected during use, such as electroplating gold, nickel, zinc, tin, and spraying epoxy on the surface.



Classification:
NdFeB is divided into sintered NdFeB and bonded NdFeB. Bonded NdFeB has a large amount of magnetism and corrosion resistance; while sintered NdFeB is easy to corrode, and the surface needs to be coated, generally galvanized, nickel-plated, environmentally friendly zinc, environmentally friendly nickel, nickel copper nickel, environmentally friendly nickel copper nickel, etc. Sintered NdFeB is generally divided into axial magnetization and radial magnetization, depending on the required working surface.
Sintered NdFeB permanent magnet materials have excellent magnetic properties and are widely used in electronics, motors, toys, packaging, hardware machinery, aerospace and other fields. The more common ones are permanent magnet motors, loudspeakers, magnetic separators, computer disk drives, magnetic resonance imaging equipment, and meters.
The uncoated nano chelating film can be used for 20-30 years under marine climate conditions and can be widely used in offshore wind power generation. The surface adhesion is more than 20Mpa, which can be widely used in permanent magnet high-speed motors, special motors, electric vehicle motors, UHV, high-voltage DC power supply systems, fast charging systems, aerospace and military industries.

chemical composition:
The neodymium magnet material is a permanent magnet material based on the intermetallic compound Nd2Fe14B. The main components are rare earth elements neodymium, iron and boron. Among them, the rare earth element is mainly neodymium. In order to obtain different properties, other rare earth metals such as dysprosium and praseodymium can be used instead. Iron can also be partially replaced by other metals such as cobalt and aluminum. The compound plays an important role, so that the compound has high saturation magnetization, high uniaxial anisotropy and high Curie temperature.
The third generation rare earth permanent magnet neodymium magnet is a powerful permanent magnet among contemporary magnets. Its main raw materials are rare earth metal neodymium 29%-32.5%, metallic element iron 63.95-68.65%, non-metallic element boron 1.1-1.2% and dysprosium 0.6-8% niobium 0.3-0.5% aluminum 0.3-0.5% copper 0.05-0.15% And other elements.

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