

(Summary description)
(Summary description)
Rare earth permanent magnetic materials are a kind of permanent magnetic materials based on intermetallic compounds formed by rare earth metal elements re (SM, Nd, PR, etc.) and transition metal elements TM (Fe, Co, etc.). Rare earth permanent magnetic materials developed by rare earth transition intermetallic compounds have excellent permanent magnetic properties. They are a kind of permanent magnetic materials with the highest coercivity and the largest magnetic energy product at present. [2]
Alnico permanent magnet appeared in the late 1940s, ferrite permanent magnet was born in the 1950s, the first generation of rare earth permanent magnet SmCo5 was developed in the 1960s, and the second generation of rare earth permanent magnet sm2co171 was successfully developed in the 1970s. In 1983, Sasakawa Zhenren of Sumitomo special metals in Japan and General Motors of the United States respectively developed Nd-Fe-B permanent magnet NdFeB, which is the third generation of rare earth permanent magnet material.
The third generation of rare earth permanent magnet materials - NdFeB permanent magnet materials are widely used in various pillar industries and high-tech industries such as computer, communication and information, medical treatment, transportation, audio equipment, office automation and household appliances because of their excellent comprehensive magnetic properties.
Since this century, the global NdFeB industry has continued to grow in large quantities driven by China. From 2002 to 2017, the annual average growth rates of sintered Nd-Fe-B production in China and the world were 17.8% and 14.5% respectively, and the annual average growth rates of bonded Nd-Fe-B production were 10.1% and 5.6% respectively. [3]
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