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    • 5. 发明授权
    • Method for the preparation of alloys of the rare earth metals of the
SE.sub. Fe.sub.17-x TM.sub.x N.sub.y type
    • 制备SE2Fe17-xTMxNy型稀土金属合金的方法
    • US5482572A
    • 1996-01-09
    • US140777
    • 1993-10-21
    • Horst EggertMichael Steinhorst
    • Horst EggertMichael Steinhorst
    • C22C33/02C22C1/04H01F1/059
    • H01F1/0596C22C1/0441
    • A method for the preparation of alloys of the SE.sub.2 Fe.sub.17-x TM.sub.xN.sub.y type where SE stands for a rare earth metal, including Y or a mixture of these metals, while TM stands for Co, Ni, Cu, Zr, Ga, Hf, Ta, Nb, Ti, Si, A1, V, Mo, Cr, Zn or Sn or a mixture of these metals, x=0 to 10, y=>0 to 5 is described. The preparation involves calciothermal reduction of a finely divided, homogeneous mixture of the alloying components, subsequent diffusion of the components, followed by nitriding and separating the calcium oxide and excess calcium formed. The method is characterized by:a) Preparation of an alloy of the SE.sub.2 Fe.sub.17-x TM.sub.x bya1) Adjusting the exothermic reaction of the calciothermal reduction by the oxide content of the reaction mixture, so that T.sub.M >TR .gtoreq.0.9 T.sub.M where T.sub.M is the melting temperature of the intermetallic phase, and T.sub.R is the reaction temperature,a2) Using a reaction mixture having components, excepting calcium, of an average particle size of .ltoreq.75 .mu.m,a3) tempering the reaction product at the end at a temperature at least 0.7 times the melting temperature T.sub.M of the desired alloy, but less than the melting temperature T.sub.M,b) Subsequently nitriding the alloy obtained with nitrogen or a mixture of nitrogen and hydrogen or NH.sub.3.
    • 一种制备SE2Fe17-xTMxNy型合金的方法,其中SE代表稀土金属,包括Y或这些金属的混合物,而TM代表Co,Ni,Cu,Zr,Ga,Hf,Ta,Nb ,Ti,Si,Al,V,Mo,Cr,Zn或Sn或这些金属的混合物,x = 0〜10,y => 0〜5。 该制备涉及合金组分的精细分散的均匀混合物的煅烧还原,随后部分的扩散,随后氮化和分离形成的氧化钙和过量的钙。 该方法的特征在于:a)通过a1)制备SE2Fe17-xTMx的合金通过反应混合物的氧化物含量来调节热电还原的放热反应,使得TM> TR> / = 0.9 TM,其中TM是 金属间化合物相的熔融温度,TR为反应温度,a2)使用平均粒径为<75μm的成分除钙以外的反应混合物,a)将反应产物末端回火 温度至少为所需合金的熔融温度TM的0.7倍,但小于熔融温度TM,b)随后氮化氮气或氮气和氢气或NH 3的混合物获得的合金。