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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 10418171 B1

PDFFull Text
Date of Patent:
Sep. 17, 2019

Filed:

Dec. 04, 2015

Production method for r—t—b-based 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 3/24 (2006.01); B22F 3/10 (2006.01); B22F 7/02 (2006.01); C22C 28/00 (2006.01); C22C 38/00 (2006.01); B22F 7/00 (2006.01); C22C 38/06 (2006.01); C22C 38/10 (2006.01); C22C 38/16 (2006.01);
U.S. Cl.
CPC ...
H01F 41/0253 (2013.01); B22F 3/10 (2013.01); B22F 3/24 (2013.01); B22F 7/008 (2013.01); B22F 7/02 (2013.01); C22C 28/00 (2013.01); C22C 38/00 (2013.01); C22C 38/001 (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 41/0293 (2013.01); B22F 2998/10 (2013.01); C22C 2202/02 (2013.01);
Abstract

A step of, while an RLM alloy powder (where RL is Nd and/or Pr; M is one or more elements selected from among Cu, Fe, Ga, Co, Ni and Al) and an RH compound powder (where RH is Dy and/or Tb; and the RH compound is an RH fluoride and/or an RH oxyfluoride) are present on the surface of a sintered R-T-B based magnet, performing a heat treatment at a sintering temperature of the sintered R-T-B based magnet or lower is included. The RLM alloy contains RL in an amount of 50 at % or more, and the melting point of the RLM alloy is equal to or less than the temperature of the heat treatment. The heat treatment is performed while the RLM alloy powder and the RH compound powder are present on the surface of the sintered R-T-B based magnet at a mass ratio of RLM alloy:RH compound=9.6:0.4 to 5:5.

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