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Recent Developments and Trends in Nd-Fe-B Magnets

Jinfang Liu, President and COO, Electron Energy Corp.
Melania Jasinski, Manager of Process Engineering, Electron Energy Corp.

Nd-Fe-B magnets have a wide variety of applications in aerospace, medical, semiconductor, telecommunications, power generation, oil & gas exploration and automotive industries.  There have been many new developments in recent years including high energy Nd-Fe-B grades, heavy rare earth free high intrinsic coecivity Nd-Fe-B grades, radially oriented anisotropic rings, and improved manufacturing processes. The Nd-Fe-B market has also met a lot of challenges and opportunities in recent years, including volatile raw materials market, overcapacity problems in China, and patent issues. This article will cover some of the recent technical advances and new trends in Nd-Fe-B magnets. MORE

Microstructure and Mechanism of Coercivity Enhancement of Sintered Nd-Fe-B Magnet by Grain Boundary Diffusion

Yong Ding, Xiangke Lv, Min Zhang,
Xiaodong Zhu, Qingzhong Yang
Ningbo Yunsheng Co., Ltd.

Rare earth element (REE) based Nd-Fe-B magnets have been widely used because of their excellent magnetic properties. The applications of Nd-Fe-B rare earth permanent magnets include hybrid electric vehicles (HEVs), power generators for wind turbines, high performance industrial motors, hard disk drives (HDD) for computers, traveling wave tubes for satellite communications, headphones and speakers, washing machines, and other consumer electronic devices. Furthermore, as well known, Dy and Tb are used as an additive to Nd-Fe-B magnets to increase the coercivity (because they increase the magneto-crystalline anisotropy) of magnets. But the magnetic moment of Dy and Tb are coupled anti-parallel to that of Fe, which decrease the magnetization and maximum energy product of the magnet. MORE

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