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AssigneesNissan Motor Co., Ltd., Osaka University
InventorsMasaru Uenohara, Takashi Furuya, Koichi Nakazawa, Shinichirou Fujikawa, Seiji Kawai, Kenichi Machida, Genya Yamato
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An improvement of coercive force of Nd—Fe—B base sintered magnet can be realized while suppressing a decrease in remanent magnetic flux density to the minimum using a method for modifying grain boundary which comprises heat-treating an Nd—Fe—B base magnet with a specific alloy disposed on its surface, the alloy having the following Formula 1: RxAyBz (1) wherein R represents at least one rare earth element including Sc and Y, A represents Ca or Li, B represents an unavoidable impurity, and 2≤x≤99, 1≤y<x, and 0≤z<y.
A method for modifying grain boundary of Nd—Fe—B base magnet, which comprises heat-treating an Nd—Fe—B base magnet with an alloy powder represented by the following chemical formula (1) disposed on a surface of the Nd—Fe—B base magnet in vacuum or in an inert gas at a temperature lower than a sintering temperature of the Nd—Fe—B base magnet;
A method for modifying grain boundary of Nd—Fe—B base magnet, which comprises heat-treating an Nd—Fe—B base magnet with an alloy powder represented by the following chemical formula (1) disposed on a surface of the Nd—Fe—B base magnet in vacuum or in an inert gas at a temperature in the range of 200° C. to 1050° C.;
Dependencies are inferred from the claim text.