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:
Jun. 02, 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;
Toshinobu Hoshino, 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;
Toshinobu Hoshino, Ibaraki, JP;
Takashi Ozaki, Ibaraki, JP;
NITTO DENKO CORPORATION, Osaka, JP;
Abstract
There are provided a permanent magnet and a manufacturing method thereof capable of decreasing an activity level of a calcined body activated by a calcination process. To fine powder of milled neodymium magnet is added an organometallic compound solution containing an organometallic compound expressed with a structural formula of M−(OR)(M represents Dy or Tb, R represents a substituent group consisting of a straight-chain or branched-chain hydrocarbon,represents an arbitrary integer) so as to uniformly adhere the organometallic compound to particle surfaces of the neodymium magnet powder. Thereafter, desiccated magnet powder is held for several hours in hydrogen atmosphere at 200 through 900 degrees Celsius. Thereafter, the powdery calcined body calcined through the calcination process in hydrogen is held for several hours in vacuum atmosphere at 200 through 600 degrees Celsius for a dehydrogenation process. Thereafter, through powder compaction and sintering process, the powdery calcined body is formed into a permanent magnet.