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:
Dec. 05, 2023
Filed:
May. 17, 2019
Tdk Corporation, Tokyo, JP;
TDK CORPORATION, Tokyo, JP;
Abstract
The R-T-B-based magnet contains one or more kinds of rare earth elements (R), a transition metal element (T) including iron or iron and Co as an essential element, B, an element M that is Ga or Ga and Al, and C. When ratios of the number of atoms of R, T, B, M, and C are set as a, b, c, d, and e, respectively, relationships of 14%≤a≤20%, 70%≤b≤82%, 4%≤c≤7%, 0.009≤d/b≤0.035, and 0.025≤e/b≤0.055 are satisfied. The R-T-B-based magnet includes main phase crystal grains having an RTB-type tetragonal structure, and a grain boundary phase including an R-T-M-C phase. When ratios of R, T, M, and C in the main phase crystal grains are set as R, T, M, and C, and ratios of R, T, M, and C in the R-T-M-C phase are set as R, T, M, and C, relationships of R>R, T<T, M>M, and C>Care satisfied, and a relationship of 0.07≤M/T≤0.65 is satisfied.