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:
Nov. 24, 2020
Filed:
Aug. 11, 2014
Hitachi Metals, Ltd., Tokyo, JP;
Takeshi Nishiuchi, Mishima-gun, JP;
Takayuki Kanda, Mishima-gun, JP;
Rintaro Ishii, Mishima-gun, JP;
Futoshi Kuniyoshi, Mishima-gun, JP;
Teppei Satoh, Mishima-gun, JP;
HITACHI METALS, LTD., Tokyo, JP;
Abstract
To provide an R-T-B based sintered magnet having high Band high Hwhile suppressing the content of Dy. Disclosed is an R-T-B based sintered magnet represented by the formula: uRwBxGayCuzAlqM(balance)T, where R is composed of light rare-earth element(s) RL and heavy rare-earth element(s) RH, RL is Nd and/or Pr, RH is Dy and/or Tb, T is Fe, and 10% by mass or less of Fe is capable of being replaced with Co, M is Nb and/or Zr, inevitable impurities being included, and u, w, x, y, z and q are expressed in terms of % by mass; RH accounts for 5% by mass or less of the R-T-B based sintered magnet, 0.4≤x≤1.0, 0.07≤y≤1.0, 0.05≤z≤0.5, 0≤q≤0.1, and 0.100≤y/(x+y)≤0.340; v=u−(6α+10β+8γ), where the amount of oxygen (% by mass) is α, the amount of nitrogen (% by mass) is β, and the amount of carbon (% by mass) is γ; and v and w satisfy the following inequality expressions: v≤32.0, 0.84≤w≤0.93, and −12.5w+38.75≤v≤−62.5w+86.125.