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US 12,586,700 B2Granted
Method for manufacturing anisotropic rare earth bulk magnet, and anisotropic rare earth bulk magnet manufactured thereby
AssigneeKorea Institute of Materials Science
InventorsJung Goo Lee, Hee Ryoung Cha, Ga Yeong Kim, Tae Hoon Kim, Young Kuk Kim, Youn Kyoung Baek
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Abstract
Proposed are a method of manufacturing an anisotropic rare-earth bulk magnet, the method being capable of suppressing formation of ReFe2 phase, and an anisotropic rare-earth bulk magnet having excellent magnetic properties.
Claims14
A method of manufacturing an anisotropic rare-earth bulk magnet, the method comprising steps of:
- preparing amorphous magnetic powders, each containing Re—Fe—B;
- manufacturing an isotropic bulk magnet by press-sintering the amorphous magnetic powders;
- and
- manufacturing an anisotropic bulk magnet by hot-deforming the isotropic bulk magnet,
- wherein the Re contains Nd and Ce, and the anisotropic bulk magnet contains a weight fraction of ReFe2 phase that satisfies Equation 1:
- P≤A*X−3
- where, P is a weight fraction (wt %) of the ReFe2 phase with respect to the entire anisotropic bulk magnet, X is a fraction of the number of moles of Ce with respect to the total number of moles of the Re, and A is 13 to 15.
4 more elements
Dependencies are inferred from the claim text.