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Permanent magnet materials

Time: 2010-07-30 09:53:56
After a magnetized by external magnetic field, even in a large reverse magnetic field, can still maintain a part or most of the original magnetization direction of the magnetic properties. The requirements of such materials is high residual magnetic flux density Br, coercive force BHC (ie anti-demagnetization capability) strong magnetic energy product (BH) (that is, to provide space for the magnetic field energy) large. Relative to the soft magnetic materials, it is also known as hard magnetic materials. Permanent magnet materials are alloys, ferrite, and three types of intermetallic compounds. ① alloy include: casting, sintering and machinability alloys. The main varieties of casting alloys: AlNi (Co), FeCr (Co), FeCrMo, FeAlC, FeCo (V) (W); sintered alloy: Re-Co (Re behalf of Rare Earth Elements), Re-Fe and AlNi (Co ), FeCrCo etc.; machinable alloy: FeCrCo, PtCo, MnAlC, CuNiFe and AlMnAg so, the latter two also known as the lower half of the BHC magnet. ② ferrite categories: the main component for the MO · 6Fe2O3, M on behalf of Ba, Sr, Pb or SrCa, LaCa and other composite components. ③ intermetallic compound classes: mainly MnBi represented. Permanent magnet material has many uses. ① Based on the principle of application of electromagnetic force are: speakers, microphones, meter, key, motors, relays, sensors, switches and so on. ② Based on the application of magnetic action principle are: the magnetron and traveling wave tubes, microwave tubes, tubes, titanium pump, microwave ferrite devices, magnetic devices, Hall devices. ③ action principle based on the application of magnetic hysteresis loops of magnetic materials are: magnetic bearings, mineral processing machine, magnetic separator, magnetic chuck, magnetic seal, magnetic board, toy, sign, password lock, copiers, temperature gages. Other applications are: magnetic, magnetic water, magnetic anesthetic. According to the need to use, permanent magnet materials have different structures and forms. Some materials are isotropic and anisotropic difference.
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