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1. 发明授权

US4723994A Method of preparing a magnetic material 失效
标题翻译：磁性材料的制备方法
公开(公告)号：US4723994A
公开(公告)日：1988-02-09
申请号：US919931
申请日：1986-10-17
申请人： Stanford R. Ovshinsky , Hellmut Fritzsche , Julius J. Harwood , Alan M. Kadin , John E. Keem
发明人： Stanford R. Ovshinsky , Hellmut Fritzsche , Julius J. Harwood , Alan M. Kadin , John E. Keem
IPC分类号： B22F9/08 , B22F9/14 , H01F1/057 , H01F1/02
CPC分类号： H01F1/0574 , B22F9/08 , B22F9/14 , H01F1/0571
摘要： A method of forming a magnetic material. The magnetic material is a solid mass of grains, and has magnetic parameters characterized by: (1) a maximum magnetic energy product, (BH).sub.max, greater than 15 megagaussoersteds; and (2) a remanence greater than 9 kilogauss. The magnetic material is prepared by a two step solidification, heat treatment process. The solidification process is carried out by: (a) providing a molten precursor alloy; (b) atomizing the molten alloy through nozzle means to form individual droplets of the molten alloy; and (c) quenching the droplets of the molten alloy to form solid particles of the alloy. The solid particles have a morphology characterized as being one or more of (i) amorphous; (ii) microcrystalline; or (iii) polycrystalline. The grains within the solid have, at this stage of the process, an average grain characteristic dimension less than that of the heat treated magnetic material. In the second, or heat treating, stage of the process, the atomized solid particles are heat treated to form a solid material comprised or grains meeting at grain boundaries. The grains and grain boundaries have the morphology of the magnetic material.
摘要翻译：一种形成磁性材料的方法。磁性材料是固体颗粒，具有磁性参数，其特征在于：（1）最大磁能积（BH）max，大于15兆比特; 和（2）大于9千字节的剩磁。磁性材料通过两步固化，热处理工艺制备。凝固过程通过以下步骤进行：（a）提供熔融前体合金; （b）通过喷嘴装置使熔融合金雾化以形成熔融合金的单个液滴; 和（c）淬灭熔融合金的液滴以形成合金的固体颗粒。固体颗粒具有以下特征的形态：（i）无定形的一种或多种; （ii）微晶; 或（iii）多晶。在该过程的这个阶段，固体颗粒的平均颗粒特征尺寸小于热处理的磁性材料的平均颗粒特征尺寸。在该方法的第二阶段或热处理阶段，雾化的固体颗粒被热处理以形成在晶界处相遇的固体材料或颗粒。晶粒和晶界具有磁性材料的形态。

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