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. 21, 2006
Filed:
Jan. 15, 2004
Yoshinobu Honkura, Tokai, JP;
Norihiko Hamada, Tokai, JP;
Chisato Mishima, Tokai, JP;
Aichi Steel Corporation, Aichi-ken, JP;
Abstract
A method for manufacturing an anisotropic magnet powder includes a high-temperature hydrogenation process of holding an RFeB-based alloy containing rare earth elements (R), B and Fe as main ingredients in a treating atmosphere under a first treating pressure (P) of which a hydrogen partial pressure ranges from 10 to 100 kPa and at a first treating temperature (T) which ranges from 953 to 1133 K, a structure stabilization process of holding the RFeB-based alloy after the high-temperature hydrogenation process under a second treating pressure (P) of which a hydrogen partial pressure is 10 or more and at a second treating temperature (T) which ranges from 1033 to 1213 K such that the condition T>Tor P>Pis satisfied, a controlled evacuation process of holding the RFeB-based alloy after the structure stabilization process in a treating atmosphere under a third treating pressure (P) of which a hydrogen partial pressure ranges from 0.1 to 10 kPa and at a third treating temperature (T) which ranges from 1033 to 1213 K, and a forced evacuation process of removing residual hydrogen (H) from the RFeB-based alloy after the controlled evacuation process. With this method, the magnetic properties of the anisotropic magnet powder can be improved.