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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 10748706 B1

PDFFull Text
Date of Patent:
Aug. 18, 2020

Filed:

Aug. 29, 2017

Method for producing sintered r-iron-boron magnet

Applicant:

Yantai Zhenghai Magnetic Material Co., Ltd., Yantai, CN;

Inventors:

Yongjiang Yu, Yantai, CN;

Xiuyan Sun, Yantai, CN;

Nan Zhao, Yantai, CN;

Xiaodong Tian, Yantai, CN;

Assignee:

YANTAI ZHENGHAI MAGNETIC MATERIAL CO., LTD., Yantai, CN;

Attorneys:

Matthias Scholl P.C.

Matthias Scholl

Primary Examiner:

Alexandra M Moore

Assistant Examiner:

Adil A Siddiqui

Int. Cl.
CPC ...
H01F 41/02 (2006.01); C22C 38/00 (2006.01); C22C 38/06 (2006.01); C22C 38/10 (2006.01); C22C 38/14 (2006.01); C22C 38/16 (2006.01); H01F 1/057 (2006.01); C22C 38/02 (2006.01); C22C 38/18 (2006.01); C22C 38/12 (2006.01); C22C 38/08 (2006.01); C22C 38/04 (2006.01); H01F 1/08 (2006.01); B22F 3/24 (2006.01); B22F 1/00 (2006.01); B22F 9/04 (2006.01);
U.S. Cl.
CPC ...
H01F 41/0266 (2013.01); C22C 38/002 (2013.01); C22C 38/005 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/08 (2013.01); C22C 38/10 (2013.01); C22C 38/12 (2013.01); C22C 38/14 (2013.01); C22C 38/16 (2013.01); C22C 38/18 (2013.01); H01F 1/0577 (2013.01); H01F 1/086 (2013.01); H01F 41/0246 (2013.01); H01F 41/0293 (2013.01); B22F 1/0011 (2013.01); B22F 9/04 (2013.01); B22F 2003/242 (2013.01); B22F 2009/044 (2013.01); B22F 2998/10 (2013.01); C22C 2202/02 (2013.01);
Abstract

A method for producing a sintered R-iron (Fe)-boron (B) magnet, the method including: (1) producing a sintered magnet R1-Fe—B-M, where R1 is neodymium (Nd), praseodymium (Pr), terbium (Tb), dysprosium (Dy), gadolinium (Gd), holmium (Ho), or a combination thereof; M is titanium (Ti), vanadium (V), chromium (Cr), manganese (Mn), cobalt (Co), nickel (Ni), gallium (Ga), calcium (Ca), copper (Cu), Zinc (Zn), silicon (Si), aluminum (Al), magnesium (Mg), zirconium (Zr), niobium (Nb), hafnium (Hf), tantalum (Ta), tungsten (W), molybdenum (Mo), or a combination thereof; (2) removing oil, washing using an acid solution, activating, and washing using deionized water the sintered magnet, successively; (3) mixing a superfine terbium powder, an organic solvent, and an antioxidant to yield a homogeneous slurry, coating the homogeneous slurry on the surface of the sintered magnet; and (4) sintering and aging the sintered magnet.

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