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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 10388442 B1

PDFFull Text
Date of Patent:
Aug. 20, 2019

Filed:

Aug. 11, 2014

R-t-b based sintered magnet and method for producing r-t-b based sintered magnet

Applicant:

Hitachi Metals, Ltd., Tokyo, JP;

Inventors:

Rintaro Ishii, Mishima-gun, JP;

Futoshi Kuniyoshi, Mishima-gun, JP;

Teppei Satoh, Mishima-gun, JP;

Assignee:

HITACHI METALS, LTD., Tokyo, JP;

Attorney:

Sughrue Mion, PLLC

Primary Examiner:

Colleen P Dunn

Assistant Examiner:

Jeremy C Jones

Int. Cl.
CPC ...
H01F 1/057 (2006.01); B22F 1/00 (2006.01); B22F 3/16 (2006.01); B22F 9/04 (2006.01); C22C 33/02 (2006.01); C22C 38/00 (2006.01); B22F 3/24 (2006.01); C22C 30/02 (2006.01); C22C 38/06 (2006.01); C22C 38/10 (2006.01); C22C 38/12 (2006.01); C22C 38/14 (2006.01); C22C 38/16 (2006.01);
U.S. Cl.
CPC ...
H01F 1/0577 (2013.01); B22F 1/0003 (2013.01); B22F 3/16 (2013.01); B22F 3/24 (2013.01); B22F 9/04 (2013.01); C22C 30/02 (2013.01); C22C 33/02 (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 38/12 (2013.01); C22C 38/14 (2013.01); C22C 38/16 (2013.01); B22F 2003/248 (2013.01); B22F 2301/355 (2013.01); B22F 2998/10 (2013.01); C22C 2202/02 (2013.01);
Abstract

To provide an R-T-B based sintered magnet having high Band high Hwhile suppressing the content of Dy, and a method for producing the same. Disclosed is an R-T-B based sintered magnet represented by the formula: uRwBxGayCuzAlqMT, where 0.20≤x≤0.70, 0.07≤y≤0.2, 0.05≤z≤0.5, 0≤q≤0.1; v=u−(6α+10β+8γ), where the amount of oxygen (% by mass) is α, the amount of nitrogen (% by mass) is β, and the amount of carbon (% by mass) is γ; when 0.40≤x≤0.70, v and w satisfy the following inequality expressions: 50w−18.5≤v≤50w−14, and −12.5w+38.75≤v≤−62.5w+86.125; and, when 0.20≤x≤0.40, v and w satisfy the following inequality expressions: 50w−18.5≤v≤50w−15.5 and −12.5w+39.125≤v≤−62.5w+86.125, and x satisfy the following inequality expression: −(62.5w+v−81.625)/15+0.5≤x≤−(62.5w+v−81.625)/15+0.8.

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