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:
Sep. 29, 2009
Filed:
Apr. 07, 2005
Hiroshi Hasegawa, Chichibu, JP;
Shiro Sasaki, Hanno, JP;
Uremu Hosono, Oyama, JP;
Masaaki Yui, Chichibu, JP;
Hiroshi Hasegawa, Chichibu, JP;
Shiro Sasaki, Hanno, JP;
Uremu Hosono, Oyama, JP;
Masaaki Yui, Chichibu, JP;
Showda Denko K.K., Tokyo, JP;
Abstract
The present invention is an alloy lump for R-T-B type sintered magnets, including an RTB columnar crystal and an R-rich phase (in which R is at least one rare earth element including Y, T is Fe or Fe with at least one transition metal element except for Fe, and B is boron or boron with carbon), in which in the as-cast state, R-rich phases nearly in the line-like or rod-like shape (the width direction of the line or rod is a short axis direction) are dispersed in the cross section, and the area percentage of the region where RTB columnar crystal grains have a length of 500 μm or more in the long axis direction and a length of 50 μm or more in the short axis direction is 10% or more of the entire alloy.