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 workability. Alnico permanent magnets have the lowest reversible temperature coefficient, and the maximum operating temperature can be as high as 600 degrees Celsius. AlNiCo magnets are widely used in various instruments and other high-temperature fields.
2. The neodymium iron boron strong magnet is the magnet with the highest commercial performance that has been found so far. It is commonly known as Magneto. It has very high magnetic properties. The maximum energy product (BHmax) is more than 10 times higher than that of the ferrite magnet. The machining performance of NdFeB is also very good. Only the working temperature is lower than that of AlNiCo magnets, the highest is 200 degrees Celsius. Because neodymium iron boron magnets are hard in texture, stable in magnetic properties, cost-effective, and widely used. Because of the strong chemical activity of NdFeB alloy, the NdFeB magnet must be coated to protect its surface. (Such as plating, nickel plating, gold plating, silver plating, electrophoretic epoxy resin, etc.).
3. Samarium cobalt magnets (SmCo) are divided into SmCo5 and Sm2Co17 according to their composition. Due to the high price of its raw materials, its popularization and application are restricted. Samarium cobalt (SmCo), like a rare earth permanent magnet, has a very high magnetic energy product (14-28MGOe), extremely stable coercivity and good temperature resistance. Compared with neodymium iron boron magnets, samarium cobalt magnets are more suitable for working in high-temperature environments.
4. Ferrite magnet "Its main raw materials include BaFe12O19 and SrFe12O19. Ferrite magnets are manufactured by ceramic technology. The texture is relatively hard and brittle. Because ferrite magnets have good temperature resistance, low price, and moderate performance, they are very widely used in the early permanent magnets.