Magnets have no effect on temperature reduction and are sensitive to temperature rise. Each magnet has its own maximum temperature. For example, the maximum working temperature of ferrite magnet is 300 ℃, and the maximum working temperature of alloy magnet such as neodymium iron boron, samarium cobalt magnet and aluminum nickel cobalt magnet can reach 500 ℃?
1. Alnico magnet is an alloy composed of aluminum, nickel, cobalt, iron and other trace metals. After casting, it can be processed into various sizes and shapes with good machinability. Alnico permanent magnet has the lowest reversible temperature coefficient, and the highest working temperature can be over 600 ℃. AlNiCo magnets are widely used in various instruments and other fields with high temperature.
2. The neodymium iron boron powerful magnet is the most commercialized magnet, commonly known as the king magnet, with very high magnetic properties. The maximum magnetic energy product (BHmax) is more than 10 times higher than the ferrite magnet. The machinability of NdFeB is also very good. Only the working temperature is lower than that of alnico magnet, and the maximum temperature is 200 ℃. Because NdFeB is hard, stable, cost-effective and widely used. Because the chemical activity of NdFeB alloy is very strong, the surface of NdFeB magnet must be protected by coating. (such as plating, nickel plating, gold plating, silver plating, electrophoresis epoxy resin, etc.).
3. SmCo magnet can be divided into SmCo5 and Sm2Co17 according to different components. Because of the high price of raw materials, its application is limited. SmCo, as a rare earth permanent magnet, has very high magnetic energy product (14-28mgoe), extremely stable coercive force and good temperature resistance. Compared with NdFeB magnets, SmCo magnets are more suitable for working at high temperature.
4. The main raw materials of ferrite magnet include BaFe12O19 and SrFe12O19. Ferrite magnet is made by ceramic technology. It is hard and brittle. Because of its good temperature resistance, low price and moderate performance, it is a very widely used permanent magnet in the early stage.
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