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1. 发明授权

US4753675A 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：US4753675A
公开(公告)日：1988-06-28
申请号：US920018
申请日：1986-10-17
申请人： Stanford R. Ovshinsky , Stephen J. Hudgens , David D. Allred , Gregory DeMaggio , Russell C. Custer
发明人： Stanford R. Ovshinsky , Stephen J. Hudgens , David D. Allred , Gregory DeMaggio , Russell C. Custer
IPC分类号： B01J19/12 , B22F9/00 , B22F9/28 , H01F1/057 , H05B6/80 , C22B1/00
CPC分类号： H01F1/0571 , B01J19/126 , B22F9/004 , B22F9/28 , H05B6/80 , B01J2219/0894 , B01J2219/1227
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 growing microwave powder or snow. The microwave powder or snow is grown by introducing a reaction gas comprised of precursor compounds of the magnetic material into a substantially enclosed reaction vessel. The reaction gas is energized by providing a source of microwave energy coupled to the substantially enclosed reaction vessel while maintaining the reaction gas pressure high enough to form the powdery microwave polymerizate, condensate, or precipitate, i.e., microwave snow. The solid particles of microwave snow 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 of 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。凝固过程是通过生长微波粉或雪来实现的。通过将由磁性材料的前体化合物构成的反应气体引入基本上封闭的反应容器中来生长微波粉末或雪。反应气体通过提供耦合到基本上封闭的反应容器的微波能量来激励，同时保持反应气体压力足够高以形成粉末微波聚合物，冷凝物或沉淀物，即微波雪。微波雪的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中，雾化的固体颗粒被热处理以形成由晶界相遇的晶粒构成的固体材料。晶粒和晶界具有磁性材料的形态。

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