A rare earth permanent magnet material is a permanent magnet material containing rare earth metals as alloying elements.
Permanent magnet material refers to the removal of magnetization of the external magnetic field and can maintain a long-term strong magnetic.
1.Define:
Rare earth permanent magnet material is an alloy composed of samarium, neodymium mixed rare earth metals and transition metals (such as cobalt, iron, etc.), which is pressed and sintered by powder metallurgy method and made by magnetic field magnetization.
Rare earth permanent magnets are divided into: SmCo (SMCO) permanent magnets and NdFeB (NdFeB) permanent magnets.
Among them, the magnetic energy product of SMCO magnet is between 15 and 30 mGoE, and that of NdFeB system magnet is between 27 and 50 mGoE, which is called "the king of permanent magnets", and it is the magnet material with the highest magnetic properties at present.Samarium and cobalt permanent magnets, despite their excellent magnetic properties, contain scarce reserves of the rare earth metal samarium and the strategic metal cobalt, which is scarce and expensive. Therefore, their development has been greatly limited.
The development of China's rare earth permanent magnet industry began in the late 1960s, when the leading product was samarium-cobalt permanent magnets. The world sales volume of samarium-cobalt permanent magnets was 630 tons, and China's was 90.5 tons (including SMCO magnetic powder), mainly used in military technology.
2.Features:
With the development of computer, communication and other industries, the rare earth permanent magnet industry, especially Nd-FeB permanent magnet industry, has been developing rapidly.
Rare earth permanent magnet materials are now known to have the highest comprehensive performance of a permanent magnet material, which is more than 100 times higher than the magnetic steel used in the 1990s, much better than ferrite, aluminum, nickel and cobalt, and twice as high as the expensive platinum and cobalt alloy magnetic properties.
The use of rare earth permanent magnet materials not only promotes the development of permanent magnet devices to miniaturization and improves the performance of products, but also promotes the generation of some special devices. As soon as rare earth permanent magnet materials appear, it immediately attracts great attention of the whole country and develops very rapidly.The properties of all kinds of rare earth permanent magnetic materials developed and produced in China have approached or reached the international advanced level.
3.Application
Rare earth permanent magnet material has become an important material in electronic technology communication, used in satellites, radar, traveling wave tubes, circulators, and micro motors, micro recorders, aviation instruments, electronic watches, seismograms and other electronic instruments.The application of rare earth permanent magnet has penetrated into automobile, household appliance, electronic instrument, nuclear magnetic resonance imager, audio equipment, micro and special motor, mobile phone and so on.
In medical treatment, the application of rare earth permanent magnet material to "magnetic point therapy" greatly improves the curative effect, thus promoting the rapid promotion of "magnetic point therapy".In the application of rare earth in various fields, rare earth permanent magnet material is the fastest developing one.It not only brings a huge impetus to the development of rare earth industry, but also has a far-reaching impact on many related industries.
With the progress of science and technology, rare earth permanent magnet material not only the application of computer, automobile, instruments, meters, household appliances, petrochemical industry, health care, aerospace and other industries of various micro motor, and nuclear magnetic resonance (NMR) equipment, electrical, magnetic separation equipment, magnetic force, magnetic therapy apparatus, machinery, such as the need to produce strong gap magnetic field of the components,In addition, the demand for high-end rare earth permanent magnet materials in emerging fields such as wind power generation, new energy vehicles, frequency conversion home appliances, energy-saving elevators, energy-saving oil pumping units is growing day by day, and the application market space is huge.
