Rare-earth magnet material, its manufacture, and rare-earth bond magnet using it

希土類磁石材料およびその製造方法ならびにそれを用いた希土類ボンド磁石

Abstract

(57)【要約】 【課題】 iHcが大きいとともに従来に比べてiHc の温度係数(η)が小さい熱安定性に優れた希土類磁石 材料およびその製造方法ならびにそれを用いた希土類ボ ンド磁石を提供する。 【解決手段】 成分組成がRαFe100-(α+β+γ+δ) MβBγNδであり、単斜晶および/または六方晶の結 晶構造を有したR3(Fe,M,B)29Nyを主相とし て含み、前記RはYを含めた希土類元素のいずれか1種 または2種以上であり、前記MはAl、Ti、V、C r、Mn、Cu、Ga、Zr、Nb、Mo、Hf、T a、Wのいずれか1種または2種以上からなり、前記 α、β、γ、δは原子百分率で下記の範囲にあることを 特徴とする希土類磁石材料。 5≦α≦18 1≦β≦50 0.1≦γ≦5 4≦δ≦30
PROBLEM TO BE SOLVED: To obtain a magnet material having a peculiar large coercive force which has a small temperature coefficient by forming a crystalline structure containing monoclinic and/or hexagonal R3 (Fe, M, B)29 Ny as a main phase by using an R-Fe-B-N magnet material having a specific ratio of components. SOLUTION: A rare-earth magnet material has a composition of RαFe100-(α+β+γ+δ) Mβ Bγ Nδcontaining monoclinic and/or hexagonal R3 (Fe, M, B)29 Ny as a main phase. The R and Y respectively represent one or two or more kinds of rare-earth elements including Y and one or two or more kinds of elements selected from among Al, Ti, V, Cr, Mn, Cu, Ga, Zr, Nb, Mo, Hf, Ta, and W and the α, β, γ, and δ are atomic percentages respectively set at 5<=α<=18, 1<=β<=50, 0.1<=γ<=5, and 4<=δ<=30. Therefore, a rare-earth magnet material and a bond magnet having high Curie temperatures and high thermal stability can be obtained.

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    US-7087185-B2August 08, 2006Seiko Epson CorporationMagnetic powder and isotropic bonded magnet