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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 10181377 B1

PDFFull Text
Date of Patent:
Jan. 15, 2019

Filed:

Aug. 30, 2013

Production method for rare earth permanent magnet

Applicant:

Shin-etsu Chemical Co., Ltd., Tokyo, JP;

Inventors:

Yoshifumi Nagasaki, Echizen, JP;

Masanobu Shimao, Echizen, JP;

Assignee:

SHIN-ETSU CHEMICAL CO., LTD., Tokyo, JP;

Attorney:

Westerman, Hattori, Daniels & Adrian, LLP

Primary Examiner:

Xiaowei Su

Int. Cl.
CPC ...
H01F 41/02 (2006.01); C21D 1/18 (2006.01); C25D 15/00 (2006.01); C25D 5/48 (2006.01); B22F 3/24 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/06 (2006.01); C22C 38/14 (2006.01); C25D 13/02 (2006.01); C25D 13/22 (2006.01); C25D 5/34 (2006.01); C25D 7/00 (2006.01); H01F 41/00 (2006.01); H01F 1/057 (2006.01);
U.S. Cl.
CPC ...
H01F 41/0253 (2013.01); B22F 3/24 (2013.01); C21D 1/18 (2013.01); C22C 38/002 (2013.01); C22C 38/005 (2013.01); C22C 38/02 (2013.01); C22C 38/06 (2013.01); C22C 38/14 (2013.01); C25D 5/34 (2013.01); C25D 5/48 (2013.01); C25D 7/001 (2013.01); C25D 13/02 (2013.01); C25D 13/22 (2013.01); C25D 15/00 (2013.01); H01F 41/005 (2013.01); H01F 41/0293 (2013.01); B22F 2003/242 (2013.01); B22F 2003/248 (2013.01); H01F 1/0577 (2013.01);
Abstract

A production method for a rare earth permanent magnet, wherein: a sintered magnet body comprising an R—Fe—B composition (Rrepresents one or more elements selected from among rare earth elements, including Y and Sc) is immersed in an electrodeposition liquid obtained by dispersing a powder containing an Roxyfluoride and/or an Rhydride (Rand Rrepresent one or more elements selected from among rare earth elements, including Y and Sc) in a solvent; an electrodeposition process is used to coat the powder onto the surface of the sintered magnet body; and, in the state in which the powder is present on the surface of the magnet body, the magnet body and the powder are subjected to a heat treatment in a vacuum or an inert gas at a temperature equal to or less than the sintering temperature of the magnet.

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