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. 26, 2019
Filed:
Dec. 30, 2013
Xiamen Tungsten Co., Ltd., Xiamen, Fujian, CN;
Hiroshi Nagata, Fujian, CN;
Chonghu Wu, Fujian, CN;
XIAMEN TUNGSTEN CO., LTD., Xiamen, Fujian, CN;
Abstract
A manufacturing method of rare earth magnet based on heat treatment of fine powder includes the following: an alloy for the rare earth magnet is firstly coarsely crushed and then finely crushed by jet milling to obtain a fine powder; the fine powder is heated in vacuum or in inert gas atmosphere at a temperature of 100° C.˜1000° C. for 6 minutes to 24 hours; then the fine powder is compacted under a magnet field and is sintered in vacuum or in inert gas atmosphere at a temperature of 950° C.˜1140° C. to obtain a sintered magnet; and machining the sintered magnet to obtain a magnet; then the magnet performs a RH grain boundary diffusion at a temperature of 700° C.˜1020° C. An oxidation film forms on the surface of all of the powder.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile