permanent magnetic materialIt has wide hysteresis loop, high coercivity and high remanence. In practice, the permanent magnet material works in the deep magnetic saturation and the demagnetization part of the second quadrant of the hysteresis loop after magnetization. Commonly used
permanent magnetic materialIt is divided into aluminum nickel cobalt permanent magnet alloy, iron chromium cobalt permanent magnet alloy, permanent magnet ferrite, rare earth permanent magnet material and composite permanent magnet material.
The second category is: ferrite permanent magnetic materials (Ferrite)
According to the production process is divided into: sintered ferrite, bonded ferrite, injection molding ferrite, these three processes according to the orientation of the magnetic crystal is different and divided into equal square and anisotropic magnets.
These are the main ones on the market.
permanent magnetic materialThere are also some due to the original production process or cost reasons, can not be a wide range of applications and eliminated, such as Cu-Ni-Fe (copper nickel iron), Fe-Co-Mo (iron cobalt molybdenum), Fe-Co-V (iron cobalt vanadium), MnBi (manganese bismuth)
Permanent magnetic materials include ferrite permanent magnets,
rare earth permanent magnet(rare earth cobalt, neodymium iron boron, etc.), aluminum nickel cobalt, iron chromium cobalt, aluminum iron and other materials, of which the most commonly used, the largest amount of ferrite permanent magnet, neodymium iron boron rare earth permanent magnet.
Ferrite permanent magnet in permanent magnet materials, although the comprehensive magnetic properties are low, but compared with metal permanent magnet, high resistivity, good stability, strong resistance to environmental changes, rich sources of raw materials, high performance price, mature technology, and there is no oxidation problem, so in many applications of permanent magnet materials, is still the most ideal choice of permanent magnet materials. Since the mass production of ferrite permanent magnet in the 1950 s, its development momentum is very rapid. The current output value is about 1.5 times that of rare earth permanent magnet. It is expected that in a long period of time in the future, it will still be the most widely used and the largest demand. Permanent magnet material.
At the same time, ferrite permanent magnets and their application products are also typical energy-saving, material-saving, foreign exchange-saving and export-earning products. No matter from the perspective of resource utilization, or from the perspective of energy and application, its development prospects are very broad. The development of ferrite permanent magnet is of great significance to the development of China's automobile, motorcycle, electronic information and other pillar industries of the national economy and export earnings, which is in line with the national industrial policy and planning. With the rapid development of electronic information technology, the market demand for high-performance ferrite permanent magnet is increasing at home and abroad. Therefore, the research and development and production of high-performance ferrite permanent magnetic materials is very necessary and promising.
