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GRAIN BOUNDARY ENGINEERING OF SINTERED MAGNETIC ALLOYS AND THE COMPOSITIONS DERIVED THEREFROM
GRAIN BOUNDARY ENGINEERING OF SINTERED MAGNETIC ALLOYS AND THE COMPOSITIONS DERIVED THEREFROM
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机译:烧结合金的晶界工程及其衍生成分
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摘要
The present disclosure is directed at methods of preparing rare earth-based permanent magnets having improved coercivity and remanence, the method comprising one or more steps comprising: (a) homogenizing a first population of particles of a first GBM alloy with a second population of particles of a second core alloy to form a composite alloy preform, the first GBM alloy being substantially represented by the formula: ACbRxCoyCudMz, the second core alloy being substantially represented by the formula G2Fe14B, where AC, R, M, G, b, x, y, and z are defined; (b) heating the composite alloy preform particles to form a population of mixed alloy particles; (c) compressing the mixed alloy particles, under a magnetic field of a suitable strength to align the magnetic particles with a common direction of magnetization and inert atmosphere, to form a green body; (d) sintering the green body; and (e) annealing the sintered body. Particular embodiments include magnets comprising neodymium-iron-boron core alloys, including Nd2Fe14B.
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机译:本公开内容针对制备具有改善的矫顽力和剩磁的稀土基永磁体的方法,该方法包括一个或多个步骤,包括:(a)将第一GBM合金的第一粒子群与第二粒子群均化。第二种芯合金制成复合合金预成型坯,第一种GBM合金基本上由下式表示:AC b Sub> R x Sub> Co y Sub> Cu d Sub> M z Sub>,第二种芯合金基本上由式G 2 Sub> Fe 14 Sub> B表示,其中定义了AC,R,M,G,b,x,y和z; (b)加热复合合金预成型颗粒,以形成大量的混合合金颗粒; (c)在适当强度的磁场下压缩混合合金颗粒,以使磁性颗粒与共同的磁化方向和惰性气氛对准,从而形成生坯; (d)烧结生坯; (e)对烧结体进行退火。具体的实施方式包括包含钕铁硼芯合金的磁体,所述钕铁硼芯合金包括Nd 2 Sub> Fe 14 Sub> B。
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