Patent ID: 6027576
Filing Date: 2000-02-22
Classification: H01F

Abstract:
A method for manufacturing a permanent magnet, comprising the steps of:a) mixing a powder of a magnetic base alloy of the general formulaSE.sub.2 T.sub.14 B,wherein SE is at least one rare earth element, including Y, and T is selected from the group consisting of Fe and a combination of Fe and Co, wherein Co does not exceed 40 weight % of the combination of Fe and Co,and a powder of a first binder alloy of a general formulaSE.sub.a Fe.sub.b Co.sub.c B.sub.d Ga.sub.eand a powder of a second binder alloy of a general formulaSE.sub.a Fe.sub.b Co.sub.c B.sub.d Ga.sub.ewherein 15<a<40, 0<b.ltoreq.80, 5.ltoreq.c.ltoreq.85, 0<d.ltoreq.20, 0<e.ltoreq.20 and a+b+c+d+e=100, and wherein the second binder alloy contains approximately 2.5 weight % fewer rare earth elements and approximately 1.5 weight % less gallium compared to the first binder alloy, in a weight ratio of base alloy to binder alloys between 99:1 to 90:10 to obtain a mixture;b) compressing the mixture to obtain a compressed mixture; andc) sintering the compressed mixture in an environment selected from the group consisting of a vacuum and an inert gas atmosphere.