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There are many kinds of magnets, which are generally divided into permanent magnet and soft magnet. What we call magnet generally refers to permanent magnet

Permanent magnet magnets are divided into two categories:

The first category is: metal alloy magnets, including Nd2Fe14B, SmCo and alnico

The second category is: ferrite permanent magnet materials

1. Neodymium iron boron magnet: it is the highest commercialized magnet found at present. It is called magneto king. It has extremely high magnetic properties, and its maximum magnetic energy product (BHmax) is more than 10 times higher than that of ferrite. Its machining performance is also quite good. The maximum working temperature can reach 200 ℃. And its hard texture, stable performance and good cost performance, so it is widely used. However, because of its strong chemical activity, its surface must be coated. (such as Zn, Ni plating, electrophoresis, passivation, etc.).

2. Ferrite magnet: its main raw materials include BaFe12O19 and SrFe12O19. It is made by ceramic process. It is a brittle material with relatively hard texture. Because ferrite magnet has good temperature resistance, low price and moderate performance, it has become the most widely used permanent magnet.