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:
Mar. 06, 2012
Filed:
Dec. 19, 2007
Hiroshi Nagata, Ibaraki, JP;
Kyuzo Nakamura, Kanagawa, JP;
Takeo Katou, Kanagawa, JP;
Atsushi Nakatsuka, Kanagawa, JP;
Ichirou Mukae, Kanagawa, JP;
Masami Itou, Kanagawa, JP;
Ryou Yoshiizumi, Kanagawa, JP;
Yoshinori Shingaki, Ibaraki, JP;
Hiroshi Nagata, Ibaraki, JP;
Kyuzo Nakamura, Kanagawa, JP;
Takeo Katou, Kanagawa, JP;
Atsushi Nakatsuka, Kanagawa, JP;
Ichirou Mukae, Kanagawa, JP;
Masami Itou, Kanagawa, JP;
Ryou Yoshiizumi, Kanagawa, JP;
Yoshinori Shingaki, Ibaraki, JP;
Ulvac, Inc., Kanagawa, JP;
Abstract
By eliminating the necessity of a prior step for cleaning a sintered magnet before adhering Dy and/or Tb to the surface of the sintered magnet S, the productivity of a permanent magnet having diffused Dy and/or Tb into grain boundary phase is improved. Iron-boron-rare earth based sintered magnet (S) disposed in a processing chamber () is heated to a predetermined temperature. An evaporating material (V) which is made of a hydride containing at least one of Dy and Tb is disposed in the same or in another processing chamber and is evaporated to cause the evaporated evaporating material to the surface of the sintered magnet. Metal atoms of Dy and/or Tb are diffused into grain boundary phase of the sintered magnet.