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。
摘要:
The invention relates to Fe Nd B type alloys for permanent magnets, the permanent magnets thus obtained and a method of producing them.They have high magnetic characteristics with good temperature resistance and good resistance to atmospheric corrosion.They comprise, in at%, 12 to 18% of rare earths, 3 to 30% of Co, 5.9 to 12% of B, 2 to 10% of V, some Al and Cu, the remainder being iron and unavoidable impurities. The V can be substituted by other refractory elements (Nb, W, Cr, Mo, Ti, Zr, Hf, Ta).The method mainly involves sintering at between 1050 and 1110.degree. C. followed by annealing at between 850 and 1050.degree. C. and/or artificial ageing at between 560.degree. C. and 850.degree. C.
摘要:
The invention relates to a method of obtaining friable and relatively inert TR Fe B type magnetic materials in divided form which lead to magnets having improved corrosion resistance. This method involves treating the material in an atmosphere containing (or capable of containing) hydrogen under the following conditions of absolute pressure (P) and of temperature (T.degree. C.): if P.ltoreq.Pa, 250 Pa, 250+100 log (P/Pa)
摘要翻译:本发明涉及一种获得脆性和相对惰性的TR Fe B型磁性材料的方法,其分为多种形式,其导致具有改善的耐腐蚀性的磁体。 该方法包括在绝对压力(P)和温度(T℃)的以下条件下在含有(或能够含有)氢气的气氛中处理材料:如果P <250,则 Pa,250 + 100log(P / Pa)
摘要:
The invention concerns a method of protecting magnetic powders and permanent magnets containing at least one rare earth, at least one transition metal and boron from oxidation and atmospheric corrosion, by the introduction of gaseous fluorine during the grinding of the powders. It is characterized in that the fluorine is introduced by a mixture of F.sub.2 +N.sub.2 during the fine grinding of the powders, the mixture containing from 1 to 100 ppm (by volume) of fluorine, and preferably from 1 to 10 ppm. The powders thus obtained are far less reactive and the densified magnets are far more resistant to atmospheric corrosion than non fluorinated powders and magnets obtained therefrom.