Rare earth-based permanent magnet
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专利名称：Rare earth-based permanent magnet 发明人：Ken Ohashi,Yoshio Tawara
申请号：US07/554073
申请日：19900716
公开号：US05034146A
公开日：
19910723
专利内容由知识产权出版社提供
摘要：The magnetic properties or, in particular, coercive force of a sintered permanent magnet composed of a light rare earth element, boron and iron can be greatly improved without affecting the residual magnetic flux by the admixture of a relatively small amount of additive elements including heavy rare earth elements, aluminum, titanium, vanadium, niobium and molybdenum. In the inventive magnets, the distribution of the additive element is not uniform but localized in the vicinity of the grain boundaries of the matrix particles. Such a localized distribution of the additive elements is obtain by sintering a powder mixture composed of a powder of an alloy of the base ingredients and a powder containing the additive element or elements.
申请人：SHIN-ETSU CHEMICAL CO., LTD.
代理机构：Hopgood, Calimafde, Kalil, Blaustein & Judlowe
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