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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 9478332 B1

PDFFull Text
Date of Patent:
Oct. 25, 2016

Filed:

Jan. 17, 2013

Method for producing r-t-b sintered magnet

Applicant:

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

Inventors:

Futoshi Kuniyoshi, Mishima-gun, JP;

Rintaro Ishii, Mishima-gun, JP;

Ryouichi Yamagata, Mishima-gun, JP;

Assignee:

HITACHI METALS, LTD., Tokyo, JP;

Attorney:

Keating & Bennett, LLP

Primary Examiner:

Jie Yang

Assistant Examiner:

Xiaowei Su

Int. Cl.
CPC ...
H01F 1/057 (2006.01); H01F 1/053 (2006.01); C22C 28/00 (2006.01); C22C 38/00 (2006.01); C22C 30/00 (2006.01); C22C 38/06 (2006.01); C22C 38/10 (2006.01); C22C 38/16 (2006.01); B22F 9/02 (2006.01); H01F 41/02 (2006.01); B22F 3/26 (2006.01); H01F 7/02 (2006.01); B22F 3/24 (2006.01); B22F 3/00 (2006.01);
U.S. Cl.
CPC ...
H01F 1/0536 (2013.01); B22F 3/24 (2013.01); B22F 3/26 (2013.01); B22F 9/023 (2013.01); C22C 28/00 (2013.01); C22C 30/00 (2013.01); C22C 38/00 (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 7/02 (2013.01); H01F 41/0293 (2013.01); B22F 3/003 (2013.01); B22F 2003/248 (2013.01); B22F 2207/01 (2013.01); B22F 2207/20 (2013.01); H01F 1/0577 (2013.01);
Abstract

A method for producing a sintered R-T-B based magnet includes providing a sintered R-T-B based magnet body, of which the rare-earth-element mole fraction falls within the range of 31 mass % to 37 mass %; providing an RH diffusion source including a heavy rare-earth element RH (which is at least one of Dy and Tb) and 30 mass % to 80 mass % of Fe; loading the sintered magnet body and the RH diffusion source into a processing chamber so that the magnet body and the diffusion source are movable relative to each other and readily brought close to, or in contact with, each other; and performing an RH diffusion process by conducting a heat treatment on the sintered magnet body and the RH diffusion source at a process temperature of 700° C. to 1000° C. while moving the sintered magnet body and the RH diffusion source either continuously or discontinuously.

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