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:
Nov. 05, 2019
Filed:
Apr. 04, 2016
Xiamen Tungsten Co., Ltd., Fujian, CN;
Fujian Changting Golden Dragon Rare-earth Co., Ltd., Fujian Province, CN;
Hiroshi Nagata, Fujian, CN;
Jianhong Zhang, Fujian, CN;
XIAMEN TUNGSTEN CO., LTD., Fujian, CN;
FUJIAN CHANGTING GOLDEN DRAGON RARE-EARTH CO., LTD, Changting, Fujian, CN;
Abstract
Disclosed is a Ho and W-containing rare-earth magnet. The rare-earth magnet comprises a RFeB type principal phase, and comprises the following raw material components: R: 28 wt % to 33 wt %, wherein R is a raw-earth element comprising Nd and Ho, and the content of Ho is 0.3 wt % to 5 wt %; B: 0.8 wt % to 1.3 wt %; W: 0.005 wt % to 0.3 wt %, and the balance of T and inevitable purities, wherein T is an element mainly comprising Fe and/or Co. The rare-earth magnet mainly consists of a W-rich grain boundary phase and a Ho-rich principal phase; crystal grain growth of the Ho-containing magnet in a sintering process is constrained by the trace of W, thereby preventing AGG from occurring on the Ho-containing magnet, and obtaining a magnet with high coercivity and high heat resistance.