What is a rare earth permanent magnet material

【China Aluminum Industry Net】Rare-earth permanent magnet material is an alloy composed of a rare earth metal and a transition metal (such as cobalt, iron, etc.), which is pressed and sintered by a powder metallurgy method, and is obtained by magnetizing a magnetic field. Magnetic material.

Rare-earth permanent magnets consist of SmCo permanent magnets and NdFeB permanent magnets, in which the magnetic energy product of SmCo magnets is between 15-30 MGOe, and the magnetic energy product of NdFeB-based permanent magnets is between 27-50 MGOe. Known as "permanent magnet king", it is a magnetic material with high magnetic properties. SmCo permanent magnets, despite their excellent magnetic properties, contain rare-earth metal scandium and scarce and expensive strategic metal cobalt. Therefore, its development has been greatly limited. The development of China's rare earth permanent magnet industry began in the late 1960s. The dominant product at the time was osmium-cobalt permanent magnets. At present, the world's sales of osmium-cobalt permanent magnets are 630 tons, and our country is 90.5 tons (including SmCo magnetic powders). Military technology.

With the development of computers, communications and other industries, rare earth permanent magnets, especially NdFeB permanent magnets, have developed rapidly.

The rare earth permanent magnet material is a permanent magnetic material with a higher comprehensive performance, which is known to be 100 times more than the magnetic properties of the magnetic steel used in the 19th century, and is much superior to ferrite and aluminum nickel and cobalt. It is twice as expensive as the expensive platinum-cobalt alloy. The use of rare earth permanent magnet materials not only promotes the development of miniaturization of permanent magnet devices, increases the performance of the products, but also promotes the production of certain special devices. Therefore, the emergence of rare earth permanent magnetic materials has 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 magnetic materials have become important materials in electronic technology communications. They are used in artificial wavers, radars, etc. in traveling wave tubes, circulators, and micro motors, micro recorders, aviation instruments, electronic watches, seismographs, and other electronic devices. On the instrument. At present, rare earth permanent magnet applications have penetrated into automobiles, home appliances, electronic instruments, nuclear magnetic resonance imaging instruments, audio equipment, micro motors, and mobile phones. In the medical field, the use of rare earth permanent magnetic materials for "magnetic cation therapy" has greatly improved the curative effect, thereby promoting the rapid promotion of "magnetic cavitation therapy." In all fields where rare earths are used, rare earth permanent magnets are the fastest growing ones. It not only brings great impetus to the development of rare earth industries, but also has a profound impact on many related industries.