Magnetic material refers to ferromagnetic material, which is the main material in electrical products, such as the iron core in motor, transformer and relay, etc. Magnetic material can be divided into two categories: soft magnetic material and hard magnetic material according to different performance.This paper mainly introduces the categories and advantages and disadvantages of permanent magnetic materials, namely hard magnetic.
ferrite
Low and medium performance, lowest price, good temperature characteristics, corrosion resistance, good price to performance.
Second, ndfeb
Highest performance, medium price, good strength, resistance to high temperature and corrosion.
Three, samarium cobalt
High performance, highest price, crisp, excellent temperature characteristics, corrosion resistance.
Aluminum, nickel and cobalt
Low and medium performance, medium price, excellent temperature characteristics, corrosion resistance, poor interference resistance.
Samarium cobalt SmCo
It is divided into SmCo5 and Sm2Co17 according to different components.High magnetic energy product (14-28 mgoe), reliable coercivity and good temperature characteristics, suitable for working in high temperature environment, expensive.
Six, AlNiCo
Can be made by casting and sintering method, casting magnet performance is higher, molding is better, sintering magnet is lower, molding is better.
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