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Title:: Technology Progress and Industry Development of Rare-earth Permanent Magnets

Author(s):: HU Boping； RAO Xiaolei；NIU E；Cai Daoyan; Zhong Ke San Huan Research

Keywords:: rare earths; permanent magnets; Nd-Fe-B; Sm-Co; sintering; bonding; rapidly quench

CLC:

PACS:: -

DOI:: 10.7502/j.issn.1674-3962.2018.09.02

DocumentCode:

Abstract:: In recent years, sintered Nd-Fe-B production techniques have been continuously progressing. The grain boundary diffusion and grain boundary modification techniques have been commonly used and the grain refinement technique is advancing. Targettype jet mills begin to be used in production. The automatic compressing, automatic inspection and automatic magnetization have been greatly improved. With wide applications of sintered Nd-Fe-B magnet in high performance motors, the R&D of magnets with both high magnetic energy product and high working temperature become the core objective, which has made notable achievement. In order to improve the balanced use of rare earth resources and reduce the magnet costs, the R&D of magnet with high abundant rareearth has made great breakthrough. For bonded magnets, the output of domestic isotropic rapid quenching Nd-Fe-B powder is growing rapidly. Sm-Fe-N powder is also in mass production. The anisotropic HDDR Nd-Fe-B powder is capable for mass production and the anisotropic bonded Nd-Fe-B is under developing. Since the beginning of the 21st century, with Chinese Nd-Fe-B industry in the lead, the global Nd-Fe-B industry is sustainably increasing. From 2002 to 2017, the average annual growth rates of sintered Nd-Fe-B magnets sales quantity is 17.8% for China and 14.5% for the world respectively. The average annual growth rates of bonded Nd-Fe-B magnets sales quantity is 10.1% for China and 5.6% for the world respectively. In 2017, the production output of global rareearth permanent magnets is 131 thousand tons. Among them, 0.6% and sintered Sm-Co magnet 1.3%.

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Technology Progress and Industry Development of Rare-earth Permanent Magnets(PDF)

MATERIALS CHINA[ISSN:1674-3962/CN:61-1473/TG]

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