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A permanent magnet and the details of the rare earth permanent magnet is introduced

by:Newland     2020-05-05
Permanent magnet and the definition of rare earth permanent magnet in the external magnetic field to pull out the case, then keep the magnetic magnetic materials, is called a permanent magnet. Points, aluminum nickel and cobalt permanent magnet, samarium cobalt, ndfeb, ferrite. Special permanent magnet in its atomic structure, atomic itself has a magnetic moment. In external forces such as magnetic field orientation of molecular guided by converged, magnetic. Rare earth permanent magnetic material is a mixture of samarium and neodymium rare earths and transition metals ( Such as cobalt, iron, etc. ) Composition of alloy, always pressed sintering of powder metallurgy method, the magnetic field after the magnetization of a magnetic material. Is divided into the first generation of SmCo5 ( RECo5) And the second generation Sm2Co17 ( RE2TM17) And the third generation of rare earth permanent magnet ndfeb ( 钕铁硼) 。 A permanent magnet and the relationship between the rare earth permanent magnet rare earth permanent magnet is one of the permanent magnet. A feature of the performance for the magnetic can not influenced by time. On its influence is environment, such as the external magnetic field, the influence of working temperature, etc. Example: N brand of ndfeb magnet, it is the highest temperature 80 ℃, the Curie temperature is 310 ℃. Be N of ndfeb magnets in the working temperature of 80 ℃ after demagnetization happens, magnetic will have loss, when the temperature reached 310 ℃, magnetic will be completely lost. The characteristics of rare earth permanent magnet is high coercive force and magnetic energy product. The first generation of rare earth permanent magnet, samarium cobalt 1:5 SmCo5 intrinsic coercive force up to 23 koe, maximum magnetic energy product 25 mgoe second generation rare earth permanent magnet, samarium cobalt 1:17 Sm2Co17 intrinsic coercive force up to 25 koe, maximum magnetic energy product 32 mgoe third generation of rare earth permanent magnet NdFeB NdFeB intrinsic coercive force up to 32 koe, maximum magnetic energy product 52 mgoe the applications of rare earth permanent magnet, rare earth permanent magnet materials a become an important material in electronic technology, communication, used in satellites, radar in the aspects of the traveling wave tube, circulator and micro-motor, miniature tape recorder, aviation instrument, electronic watches, seismographs, and other electronic devices. A rare earth permanent magnet application osmosis to the automotive, home appliances, electronic instruments, magnetic resonance imaging, audio equipment, micro motors, mobile phone, etc.
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