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:
Aug. 20, 2013
Filed:
Aug. 17, 2011
Takashi Takami, Saitama, JP;
Hiroshi Iwasaki, Saitama, JP;
Yoshinori Kobayashi, Saitama, JP;
Naoki Mochi, Saitama, JP;
Ryuji Gotoh, Gunma, JP;
Takashi Takami, Saitama, JP;
Hiroshi Iwasaki, Saitama, JP;
Yoshinori Kobayashi, Saitama, JP;
Naoki Mochi, Saitama, JP;
Ryuji Gotoh, Gunma, JP;
Hitachi Metals, Ltd., Tokyo, JP;
Abstract
A method for producing a sintered ferrite magnet having an M-type ferrite structure and represented by: CaRBaFeCo, (by atomic ratio), where 0.3≦1−x−y≦0.65, 0.2≦x≦0.65, 0.001≦y≦0.2, 0.03≦z≦0.65, 4≦n≦7, and 1−x−y>y. The method includes mixing a Ca compound, an R element compound, a Ba compound, an iron compound and a Co compound as starting materials; calcining the starting materials to obtain calcined bodies; pulverizing the calcined bodies to obtain a calcined powder; providing recycled materials having an M-type ferrite structure and being represented by the above formula; pulverizing the recycled materials to obtain a recycled material powder; mixing the recycled material powder with the calcined powder to form a moldable material; molding the moldable material to obtain green bodies; and sintering the green bodies to obtain the sintered ferrite magnet.