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.:
Date of Patent:
Mar. 01, 2016
Filed:
Nov. 25, 2013
Applicant:
Hitachi Metals, Ltd., Tokyo, JP;
Inventors:
Assignee:
HITACHI METALS, LTD., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C23C 22/48 (2006.01); H01F 1/053 (2006.01); H01F 41/02 (2006.01); B22F 3/24 (2006.01); C22C 33/02 (2006.01); C22C 38/00 (2006.01); C23C 22/34 (2006.01); H01F 1/057 (2006.01); H01F 7/02 (2006.01); H01F 7/00 (2006.01);
U.S. Cl.
CPC ...
H01F 41/026 (2013.01); B22F 3/24 (2013.01); C22C 33/0278 (2013.01); C22C 38/00 (2013.01); C23C 22/34 (2013.01); H01F 1/0577 (2013.01); H01F 7/0221 (2013.01); B22F 2003/241 (2013.01); B22F 2207/01 (2013.01); C22C 2202/02 (2013.01); Y10T 428/12465 (2015.01);
Abstract
An object of the present invention is to provide an R—Fe—B based sintered magnet having on a surface thereof a chemical conversion film with higher corrosion resistance than a conventional chemical conversion film such as a phosphate film, and a method for producing the same. The corrosion-resistant magnet of the present invention as a means for achieving the object is characterized by comprising a chemical conversion film containing at least Zr, Nd, fluorine, and oxygen as constituent elements and not containing phosphorus directly on a surface of an R—Fe—B based sintered magnet, wherein R is a rare-earth element including at least Nd.