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. 15, 2018
Filed:
Mar. 25, 2015
Hitachi Metals, Ltd., Tokyo, JP;
Noriyuki Nozawa, Mishima-gun, JP;
HITACHI METALS, LTD., Tokyo, JP;
Abstract
Disclosed is a method for manufacturing an R-T-B based sintered magnet, which includes the steps of: preparing an R-T-B based sintered magnet material; and performing a heat treatment by heating the R-T-B based sintered magnet material at a temperature of 450° C. or higher and 470° C. or lower for 4 hours or more and 12 hours or less, wherein the R-T-B based sintered magnet material is represented by the formula of: uRwBxGayCuzAlqM (100−u−w−x−y−z−q) T, the content of RH is 5% or less by mass in the R-T-B based sintered magnet, 29.5≤u≤32.0, 0.86≤w≤0.93, 0.2≤x≤1.0, 0.3≤y≤1.0, 0.05≤z≤0.5, 0≤q≤0.1, and a relationship of p<0 is satisfied when p=[B]/10.811×14−[Fe]/55.847−[Co]/58.933.