Rare earth permanent magnet material

- Nov 04, 2017 -

Rare earth permanent magnet material is a magnetic material made of a mixture of samarium, neodymium mixed rare earth metals and transition metals (such as cobalt, iron, etc.), press-sintered with a powder metallurgy method and magnetized by a magnetic field. Rare earth permanent magnet samarium cobalt (SmCo) permanent magnet and NdFeB permanent magnet, wherein the SmCo magnet energy product between 15 ~ 30MGOe, NdFeB permanent magnet magnetic energy product between 27 ~ 50MGOe, was Known as the "permanent magnet king", is currently the highest magnetic permanent magnet material. Samarium cobalt permanent magnets, despite their excellent magnetic properties, contain rare earth samarium and scarce and expensive strategic cobalt metals, so their development has been severely limited. The development of China's rare earth permanent magnet industry began in the late 60s of last century, when the leading product was samarium-cobalt permanent magnet, the current samarium-cobalt permanent magnet world sales of 630 tons, China 90.5 tons (including SmCo magnetic powder), the main For military technology. With the development of computer, communication and other industries, rare earth permanent magnets, especially NdFeB permanent magnet industry, have been developed rapidly.

Rare earth permanent magnet material is now known as the highest performance of a permanent magnet material, magnetic properties than the magnetism used in the 19th century more than 100 times higher than Ceramic, Alnico performance is much better than The expensive platinum cobalt alloy also doubled its magnetic properties. As the use of rare earth permanent magnetic materials, not only to promote the development of miniaturized permanent magnet devices to improve the performance of the product, but also to promote the production of some special devices, rare earth permanent magnet material appears, immediately attracted great attention of all countries, The development is extremely rapid. The performance of various rare earth permanent magnetic materials developed and produced in China has approached or reached the international advanced level.

Now rare earth permanent magnet material has become an important material in the electronic technology communication, used in satellites, radar and other aspects of the traveling wave tube, circulator and micro-motors, micro-recorders, aeronautical instruments, electronic watches, seismometers and other electronic Instrument. The current rare earth permanent magnet applications have infiltrated the automotive, household appliances, electronic instruments, MRI machines, audio equipment, micro motor, mobile phones and so on. In the area of medical treatment, the use of rare earth permanent magnetic materials for "magnetic therapy" has greatly improved the curative effect, thus promoting the rapid promotion of "magnetic therapy". In all fields of application of rare earth, rare earth permanent magnet material is the fastest growing one. It not only brings great impetus to the development of rare earth industry, but also has quite far-reaching impact on many related industries.

Article from NdFeB Industry Network

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