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US 12,394,546 B2Granted
Method for producing magnet powder and sintered magnet produced by the same
AssigneeLG Chem, Ltd.
InventorsJinhyeok Choe, Soon Jae Kwon, Hyounsoo Uh, Kwang Won Jeon, Seung Ho Moon, Jakyu Chun
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Abstract
A method for producing a magnet powder is provided in the present disclosure. The method includes synthesizing a R—Fe—B-based magnet powder by a reduction-diffusion process, coating an antioxidant film onto a surface of the R—Fe—B-based magnet powder, and immersing and cleaning the R—F—B-based magnet powder in an aqueous solvent or a non-aqueous solvent, wherein R is Nd, Pr, Dy or Tb, and wherein the antioxidant film includes a compound containing at least one amino group.
Claims7
A method for producing a magnet powder comprising:
- synthesizing a R—Fe—B-based magnet powder by a reduction-diffusion process;
- coating an antioxidant film onto a surface of the R—Fe—B-based magnet powder;
- and
- immersing and cleaning the R—Fe—B-based magnet powder in an aqueous solvent or a non-aqueous solvent, and
- wherein coating the antioxidant film onto the surface of the R—Fe—B-based magnet powder is performed before immersing and cleaning the R—Fe—B-based magnet powder,
- wherein R is Nd, Pr, Dy or Tb,
- wherein the antioxidant film includes a compound containing at least one amino group, and
- wherein the compound includes at least one selected from the group consisting of ethylene diamine and 2-ethylhexyloxy propyl amine.
5 more elements
Dependencies are inferred from the claim text.