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    • 2. 发明授权
    • Magnetic materials and method of making them
    • 磁性材料及其制作方法
    • US5634987A
    • 1997-06-03
    • US367171
    • 1995-04-05
    • Pengzhen ZhangRobert A. BuckleyHywel A. DaviesAzwar Manaf
    • Pengzhen ZhangRobert A. BuckleyHywel A. DaviesAzwar Manaf
    • C21D6/00B22F9/00C22C38/00H01F1/053H01F1/057H01F1/06
    • H01F1/0571B22F9/007
    • A method for the preparation of a two-phase magnetic material that includes as the major phase a crystalline alloy of one or more rare earth metals, boron and iron, substantially all of the crystallites of which have a size of less than 35 nanometers, and as the minor phase .alpha.-Fe, involves the steps of (i) melt spinning an alloy consisting of up to 12 atomic percent of one or more rare earth metals, 3 to 7 atomic percent of boron and the balance iron or a mixture of iron and cobalt; (ii) quenching the melt spun alloy form step (i) under conditions such that a mixture of crystalline and amorphous material is produced, (iii) subjecting the material from step (ii) to an annealing treatment under conditions such that controlled crystal growth occurs to provide the crystalline alloy phase, substantially all of which has a particle size of less than 35 nanometers, the resulting materials having a remanence in excess of the theoretical value of 0.8 Tesla.
    • PCT No.PCT / GB93 / 01476 Sec。 371日期1995年04月5日 102(e)日期1995年4月5日PCT提交1993年7月15日PCT公布。 出版物WO94 / 02950 日期1994年2月3日一种用于制备二相磁性材料的方法,其包括作为主相的一种或多种稀土金属,硼和铁的晶体合金,其基本上所有的微晶的尺寸较小 并且作为次相α-Fe,涉及以下步骤:(i)将由至多12原子%的一种或多种稀土金属,3至7原子%的硼和余量的铁组成的合金熔融纺丝 或铁和钴的混合物; (ii)在制备结晶和无定形材料的混合物的条件下使步骤(i)的熔融纺丝合金淬火,(iii)使来自步骤(ii)的材料在受控晶体生长发生的条件下进行退火处理 以提供晶体合金相,其基本上全部具有小于35纳米的粒度,所得材料具有超过理论值0.8特斯拉的剩磁。