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.
Type:
Grant
Filed:
December 9, 2005
Date of Patent:
May 27, 2008
Assignee:
Shanxi Huiqiang Magnetic Material Manufacturing Co., Ltd.
Inventors:
Min Zhang, Fengrui Zhang, Zhendong Kang, Sanwen Qi
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.
Type:
Application
Filed:
December 9, 2005
Publication date:
April 27, 2006
Applicant:
Shanxi Huiqiang Magnetic Material Manufacturing Co., Ltd.
Inventors:
Min Zhang, Fengrui Zhang, Zhendong Kang, Sanwen Qi