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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 10589355 B1

PDFFull Text
Date of Patent:
Mar. 17, 2020

Filed:

Oct. 12, 2016

Method for modifying grain boundary of nd—fe—b base magnet, and body with modified grain boundary treated by the method

Applicants:

Nissan Motor Co., Ltd., Yokohama-shi, Kanagawa, JP;

Osaka University, Suita-Shi, Osaka, JP;

Inventors:

Masaru Uenohara, Kanagawa, JP;

Takashi Furuya, Kanagawa, JP;

Koichi Nakazawa, Kanagawa, JP;

Shinichirou Fujikawa, Kanagawa, JP;

Seiji Kawai, Kanagawa, JP;

Kenichi Machida, Osaka, JP;

Genya Yamato, Osaka, JP;

Assignees:

Nissan Motor Co., Ltd., Yokohama-shi, Kanagawa, JP;

Osaka University, Suita-Shi, Osaka, JP;

Attorney:

Young Basile Hanlon & MacFarlane, P.C.

Primary Examiner:

Colleen P Dunn

Assistant Examiner:

Michael J Kachmarik

Int. Cl.
CPC ...
B22F 3/12 (2006.01); B22F 3/24 (2006.01); B22F 1/00 (2006.01); B22F 1/02 (2006.01); B22F 9/04 (2006.01); H01F 1/057 (2006.01); H01F 41/02 (2006.01); C23C 24/00 (2006.01); B22F 3/26 (2006.01); B22F 9/06 (2006.01); C22C 28/00 (2006.01); C22C 38/00 (2006.01); C22C 1/04 (2006.01);
U.S. Cl.
CPC ...
B22F 3/12 (2013.01); B22F 1/0081 (2013.01); B22F 1/025 (2013.01); B22F 3/24 (2013.01); B22F 9/04 (2013.01); B22F 9/06 (2013.01); C22C 28/00 (2013.01); C23C 24/00 (2013.01); H01F 1/0577 (2013.01); H01F 41/0293 (2013.01); B22F 1/0059 (2013.01); B22F 3/26 (2013.01); B22F 2003/242 (2013.01); B22F 2009/041 (2013.01); B22F 2009/043 (2013.01); B22F 2998/10 (2013.01); B22F 2999/00 (2013.01); C22C 1/0441 (2013.01); C22C 38/00 (2013.01); C22C 2202/02 (2013.01);
Abstract

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:RAB  (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.

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