permanent magnetic material

¢Û permanent magnetic ferrite. Mainly barium ferrite and strontium ferrite, the resistivity high coercivity, can be effectively used in air-gap magnetic circuit, especially suited for small generators and the permanent magnet motor. Hard ferrite non-precious metals nickel, cobalt, rich source of raw materials, the process is simple, low cost, can be a substitute for aluminum nickel and cobalt permanent magnet manufacturing magnetic separation, magnetic thrust bearing, speakers, such as microwave devices. However, the lower its maximum energy product, poor temperature stability, texture than crisp, fragile, impatient shock and vibration, it is not appropriate for measuring instruments and precision requirements of the magnetic devices.

¢Ü rare earth permanent magnet materials. Cobalt is rare earth permanent magnet materials and Nd-Fe-B permanent magnet materials. The former is rare earth elements cerium, praseodymium, lanthanum, neodymium and cobalt, such as formation of intermetallic compounds, the energy product up to 150 times more than carbon steel, aluminum nickel and cobalt permanent magnet materials 3 to 5 times, hard ferrite 8 ~ 10 times, low temperature coefficient, magnetic stability, and the coercivity of up to 800 1000 / m. Mainly used for low-speed torque motor, activated motors, sensors, such as magnetic bearings pushed the magnetic system. Nd-Fe-B permanent magnet material is a third-generation rare earth permanent magnet material, remanence, and the coercivity of the largest energy product than the former, non-friable, better mechanical properties of the alloy with low-density, magnetic components to the light , thin, small and ultra-small. However, its magnetic temperature coefficient higher, limiting its application.

¢Ý permanent magnet material from the compound of permanent magnet material and as a powder binder from the plastic composite material. Because they contain a certain proportion of binder, so the magnetic properties than the corresponding binder did not significantly reduce the magnetic material. In addition to permanent metal composite materials, other composite materials because of the permanent magnet of the heat-resistant adhesive constraints, the use of lower temperatures, less than 150 ¡æ. But the size of permanent magnet material and high precision, good mechanical properties, the magnet properties of the various parts of the uniform, and easy to approach and multi-radial magnet magnetization. Mainly used in the manufacture of instrumentation, communications equipment, rotating machinery, and sports equipment such as magnetic.

Tags: neodymium magnets permanent magnetic material,magnet Smco magnets