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, 2012
Filed:
Jul. 25, 2008
Tomoori Odaka, Osaka, JP;
Hideyuki Morimoto, Osaka, JP;
Kohshi Yoshimura, Osaka, JP;
Shigeru Takaki, Osaka, JP;
Shinichiro Sakashita, Osaka, JP;
Tomoori Odaka, Osaka, JP;
Hideyuki Morimoto, Osaka, JP;
Kohshi Yoshimura, Osaka, JP;
Shigeru Takaki, Osaka, JP;
Shinichiro Sakashita, Osaka, JP;
Hitachi Metals, Ltd., Tokyo, JP;
Abstract
An R—Fe—B based rare-earth sintered magnet according to the present invention includes, as a main phase, crystal grains of an RFeB type compound that includes Nd, which is a light rare-earth element, as a major rare-earth element R. The magnet includes a heavy rare-earth element RH (which is at least one of Dy and Tb) that has been introduced through the surface of the sintered magnet by diffusion. The magnet has a region in which the concentration of the heavy rare-earth element RH in a grain boundary R-rich phase is lower than at the surface of the crystal grains of the RFeB type compound but higher than at the core of the crystal grains of the RFeB type compound.