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. 09, 2022
Filed:
Jun. 05, 2020
Shin-etsu Chemical Co., Ltd., Tokyo, JP;
Tetsuya Ohashi, Echizen, JP;
Tetsuya Kume, Echizen, JP;
Koichi Hirota, Echizen, JP;
Hajime Nakamura, Echizen, JP;
SHIN-ETSU CHEMICAL CO., LTD., Tokyo, JP;
Abstract
An R—Fe—B base sintered magnet is provided comprising a main phase containing an HR rich phase of (R',HR)(Fe,(Co))B wherein R′ is an element selected from yttrium and rare earth elements exclusive of Dy, Tb and Ho, and essentially contains Nd, and HR is an element selected from Dy, Tb and Ho, and a grain boundary phase containing a (R′,HR)—Fe(Co)-Mphase in the form of an amorphous phase and/or nanocrystalline phase, the (R′,HR)—Fe(Co)-Mphase consisting essentially of 25-35 at % of (R′,HR), 2-8 at % of Mwhich is at least one element selected from Si, Al, Mn, Ni, Cu, Zn, Ga, Ge, Pd, Ag, Cd, In, Sn, Sb, Pt, Au, Hg, Pb, and Bi, up to 8 at % of Co, and the balance of Fe. The HR rich phase has a higher HR content than the HR content of the main phase at its center. The magnet produces a high coercivity despite a low content of Dy, Tb and Ho.