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:
May. 27, 2008
Filed:
Dec. 09, 2005
Applicants:
Min Zhang, Taiyuan, CN;
Fengrui Zhang, Taiyuan, CN;
Zhendong Kang, Taiyuan, CN;
Sanwen Qi, Taiyuan, CN;
Inventors:
Min Zhang, Taiyuan, CN;
Fengrui Zhang, Taiyuan, CN;
Zhendong Kang, Taiyuan, CN;
Sanwen Qi, Taiyuan, CN;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01F 1/057 (2006.01);
U.S. Cl.
CPC ...
Abstract
The present invention provides a tempering process for sintered Nd—Fe—B permanent magnet material, which optimizes the microstructure of the Nd—Fe—B magnet and improves intrinsic coercive force and its consistency by increasing the cooling rate after tempering. After heating to a temper temperature, the magnetic material is cooled in a cooling liquid within a cooling chamber into which a pressurized cooling gas is introduced.