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Journal of Applied Physics | 1998

High performance Nd–Fe–B sintered magnets made by the wet process

Miyoshi Takahashi; Kimio Uchida; Fumitake Taniguchi; T. Mikamoto

The wet process for the fabrication of Nd–Fe–B sintered magnets has been developed on the mass production scale. In this process, mineral oil is used as a solvent to prevent the milled powder and green bodies from oxidation. It is removed before sintering. As a result, the oxygen uptake during storage is less than 0.01 wt %/day. By reducing the oxygen content and the total rare earth (TRE) content in sintered magnets to less than 0.2 and 29.3 wt %, respectively, magnets with (BH)max/iHc greater than 50 MGOe/10 kOe, 45 MGOe/15 kOe, and 32 MGOe/32 kOe were obtained with high reliability. The magnets produced by this wet process also show better corrosion resistance and 20% higher mechanical strength than those made by conventional methods. These characteristics may be explained by a smaller grain size, smaller TRE content, and higher density produced by the wet process.


Archive | 1999

R-t-b sintered permanent magnet

Kimio Uchida; Tsunehiro Kawata


Archive | 1996

Rare earth permanent magnet and method for producing the same

Kimio Uchida; Masahiro Takahashi; Fumitake Taniguchi


Archive | 1984

Apparatus for producing anisotropic magnets

Shigeho Tanigawa; Shuichi Shiina; Kimio Uchida


Archive | 2001

Method for producing sintered rare earth magnet and sintered ring magnet

Hisato Tokoro; Kimio Uchida


Archive | 1987

Method of producing neodymium-iron-boron permanent magnet

Masaaki Tokunaga; Kimio Uchida; Akitoshi Hiraki


Archive | 1998

Rare earth permanent magnet and production method thereof

Kimio Uchida; Masahiro Takahashi


Archive | 2001

Manufacturing method of rare earth sintered magnet, ring magnet, and arc segment magnet

Hisato Tokoro; Kimio Uchida; 公穂 内田; 久人 所


Archive | 1994

Method for producing R-Fe-B-based, sintered magnet

Kimio Uchida; Masahiro Takahashi; Masamichi Ozaki; Akira Kikuchi


Archive | 1988

Permanent magnet for accelerating corpuscular beam

Shigeho Tanigawa; Kimio Uchida

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