摘要:
A magnetic powder for the manufacture of sintered magnets of the RE-T-B family, where RE represents at least one rare earth, T represents at least one transition element and B represents boron, the powder possibly containing other minor elements, is constituted by a mixture of two powders (A) and (B):a) Powder (A) consists of grains with a quadratic structure RE.sub.2 T.sub.14 B, T being mainly iron with Co/Fe
摘要翻译:用于制造RE-TB族烧结磁体的磁粉,其中RE表示至少一种稀土,T表示至少一种过渡元素,B表示硼,可能含有其它次要元素的粉末由混合物 的两种粉末(A)和(B):a)粉末(A)由具有二次结构RE2T14B的晶粒组成,T主要是Co / Fe <8%的铁,并且可能含有高达0.5%的Al 至少0.05%的Cu和至少4%的V族,Nb,Hf,Mo,Cr,Ti,Zr,Ta,W和不可避免的杂质中的至少一种元素,Fisher粒度在3.5至5μm之间 ; b)粉末(B)富含RE,含有Co,并且具有以下重量组成:RE 52-70%,包含至少40%(绝对值)的一种或多种轻稀土,选自 La,Ce,Pr,Nd,Sm,Eu; 氢含量(重量ppm)大于130%的RE; Co 20-35%; Fe 0-20%; B = 0-0.2%; Al 0.1-4%; 和不可避免的杂质,所述粉末的Fisher粒度在2.5至3.5μm之间。 粉末(B)可以通过将含有Co的富含RE的粉末(C)与富B粉末(D)混合来制备。