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. 26, 2015
Filed:
Mar. 28, 2011
Izumi Ozeki, Ibaraki, JP;
Katsuya Kume, Ibaraki, JP;
Keisuke Hirano, Ibaraki, JP;
Tomohiro Omure, Ibaraki, JP;
Keisuke Taihaku, Ibaraki, JP;
Takashi Ozaki, Ibaraki, JP;
Izumi Ozeki, Ibaraki, JP;
Katsuya Kume, Ibaraki, JP;
Keisuke Hirano, Ibaraki, JP;
Tomohiro Omure, Ibaraki, JP;
Keisuke Taihaku, Ibaraki, JP;
Takashi Ozaki, Ibaraki, JP;
NITTO DENKO CORPORATION, Osaka, JP;
Abstract
There are provided a permanent magnet and a manufacturing method thereof enabling carbon content contained in magnet particles to be reduced in advance before sintering even when wet milling is employed. Coarsely-milled magnet powder is further milled by a bead mill in a solvent together with an organometallic compound expressed with a structural formula of M-(OR)(M represents V, Mo, Zr, Ta Ti W or Nb, R represents a substituent group consisting of a straight-chain or branched-chain hydrocarbon, X represents an arbitrary integer) so as to uniformly adhere the organometallic compound to particle surfaces of the magnet powder. Thereafter, a compact body of compacted magnet powder is held for several hours in hydrogen atmosphere at 200 through 900 degrees Celsius to perform hydrogen calcination process. Thereafter, through sintering process, a permanent magnetis formed.