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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 10563295 B1

PDFFull Text
Date of Patent:
Feb. 18, 2020

Filed:

Apr. 23, 2015

Method for producing r-t-b sintered magnet

Applicant:

Hitachi Metals, Ltd., Minato-ku, Tokyo, JP;

Inventor:

Shuji Mino, Mishima-gun, JP;

Assignee:

HITACHI METALS, LTD., Tokyo, JP;

Attorney:

Keating & Bennett, LLP

Primary Examiner:

Xiaowei Su

Int. Cl.
CPC ...
H01F 41/02 (2006.01); H01F 1/057 (2006.01); B22F 3/10 (2006.01); B22F 3/26 (2006.01); C23C 8/72 (2006.01); B22F 3/24 (2006.01); C22C 28/00 (2006.01); B22F 1/00 (2006.01); B22F 3/00 (2006.01); C22C 33/02 (2006.01); B22F 3/12 (2006.01); C22C 38/00 (2006.01); C22C 38/06 (2006.01); C22C 38/10 (2006.01); C22C 38/16 (2006.01);
U.S. Cl.
CPC ...
C23C 8/72 (2013.01); B22F 1/00 (2013.01); B22F 1/0003 (2013.01); B22F 3/00 (2013.01); B22F 3/12 (2013.01); B22F 3/24 (2013.01); C22C 28/00 (2013.01); C22C 33/02 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/005 (2013.01); C22C 38/06 (2013.01); C22C 38/10 (2013.01); C22C 38/16 (2013.01); H01F 1/0577 (2013.01); H01F 41/0266 (2013.01); H01F 41/0293 (2013.01); B22F 2003/248 (2013.01); B22F 2301/10 (2013.01); B22F 2301/355 (2013.01); B22F 2301/45 (2013.01); B22F 2998/10 (2013.01); C22C 38/00 (2013.01);
Abstract

A step is provided which performs a heat treatment at the sintering temperature of a sintered R-T-B based magnet or lower, while a powder of an RLM alloy (where RL is Nd and/or Pr; M is one or more selected from among Cu, Fe, Ga, Co and Ni) and a powder of an RH fluoride (where RH is Dy and/or Tb) are present on a surface of the sintered R-T-B based magnet. The RLM alloy contains RL in an amount of 50 at % or more, and a melting point of the RLM alloy is equal to or less than a temperature of the heat treatment. The heat treatment is performed while the RLM alloy powder and the RH fluoride powder are present on the surface of the sintered R-T-B based magnet at a mass ratio of RLM alloy:RH fluoride=96:4 to 5:5.

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