Ferrite permanent magnets can be divided into NdFeb magnet, ferrite magnet, aluminium nickel cobalt magnet, samarium cobalt, etc., each kind because of the different composition, so the characteristics will be different.
It is currently found the commercial performance of the highest magnet, known as the magnetic king, with very high magnetic properties of its maximum magnetic energy product (BHmax) higher than Ferrite (Ferrite) more than 10 times. Its own mechanical performance is also quite good. Operating temperature up to 200 degrees Celsius. And its hard texture, stable performance, a good cost performance, so its application is extremely wide. However, because of its strong chemical activity, it must be processed for surface smears. (such as Zn plating, Ni plating, electrophoresis, passivation, etc.).
Its main raw materials include BaFe12O19 and SrFe12O19. It is made by the ceramic process, which is hard in texture and brittle in material. Because of its good temperature resistance, low price and moderate performance, ferrite magnet has become the most widely used permanent magnet.
It is an alloy of aluminium, nickel, cobalt, iron and other trace metals. The casting process can be processed into different sizes and shapes, machinability is very good. Casting Al Ni Co permanent magnet has the lowest reversible temperature coefficient, the working temperature can be up to 600 degrees Celsius. Alni - Co permanent magnet products are widely used in various instruments and other applications.
It is divided into SmCo5 and Sm2Co17 according to the composition. Its development is limited by the high price of its materials. As a rare earth permanent magnet, samarium cobalt (SmCo) not only has a high magnetic energy product (14-28 Mgoe), reliable coercivity and good temperature characteristics. Compared with Ndfeb magnets, samarium cobalt magnets are more suitable for working in high-temperature environments.