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21. 发明授权

US5061412A Process for producing a magnet of strontium ferrite having high performance 失效
标题翻译：具有高性能的锶铁氧体磁体的制造方法
公开(公告)号：US5061412A
公开(公告)日：1991-10-29
申请号：US501883
申请日：1990-03-30
申请人： Kunio Okumori , Kazuo Terada
发明人： Kunio Okumori , Kazuo Terada
IPC分类号： C04B35/26
CPC分类号： C04B35/2683 , Y10S264/58
摘要： An iron ore or mill scale is crushed to form a powder having an average particle diameter not exceeding 12 microns. The powder is heated at a temperature of 600.degree. C. to 900.degree. C. in the presence of oxygen to form an iron oxide containing at least 98.0% of Fe.sub.2 O.sub.3. The iron oxide is mixed with strontium oxide or carbonate. The mixture is calcined to form strontium ferrite. The calcined product is pulverized, the crushed material is molded in a magnetic field, and the molded product is sintered to yield a magnet of strontium ferrite having a high level of performance.
摘要翻译：将铁矿石或粉碎物粉碎以形成平均粒径不超过12微米的粉末。在氧气存在下，将该粉末在600〜900℃的温度下加热，形成含有至少98.0％的Fe 2 O 3的氧化铁。氧化铁与氧化锶或碳酸盐混合。将混合物煅烧形成锶铁氧体。将煅烧产物粉碎，将破碎的材料在磁场中模制，并将模制产品烧结以产生具有高性能水平的锶铁氧体磁体。

22. 发明授权

US5053156A Process for producing ferrite powder for ferrite magnets 失效
标题翻译：铁氧体磁铁用铁氧体粉末的制造方法
公开(公告)号：US5053156A
公开(公告)日：1991-10-01
申请号：US618937
申请日：1990-11-28
申请人： Kunio Okumori , Kazuo Terada
发明人： Kunio Okumori , Kazuo Terada
IPC分类号： C01G49/00 , C04B35/26 , H01F1/34
CPC分类号： C04B35/2683
摘要： A process for producing ferrite powder for high performance ferrite magnets is claimed, which comprises: milling magnetite or mill scale into a powder comprising particles of specified particle size; oxidizing the milled product to obtain a powder containing 98.0% or higher Fe.sub.2 O.sub.3 ; further adding thereto iron oxide originated from iron chloride or iron sulfide together with an oxide or a carbonate of Sr or Ba; and calcining the resulting powder mixture.The present invention provides a low-cost process for producing ferrite powder for ferrite magnets having high pellet strength as well as high magnetic properties, from which a high performance Sr-ferrite magnet as well as Ba-ferrite magnet suitable for use in automobile motors can be readily produced by simply molding the powder under a magnetic field and sintering.
摘要翻译：一种用于生产用于高性能铁氧体磁体的铁氧体粉末的方法，其特征在于，它包括：将磁铁矿或磨料粉碎成包含特定粒度的颗粒的粉末; 氧化研磨产物得到含有98.0％或更高的Fe 2 O 3的粉末; 进一步添加源自氯化铁或硫化铁的氧化铁与Sr或Ba的氧化物或碳酸盐; 并煅烧所得的粉末混合物。本发明提供了一种用于制造铁氧体磁铁铁氧体粉末的低成本方法，其具有高的颗粒强度以及高的磁性能，其中适用于汽车电动机的高性能Sr-铁氧体磁体以及Ba-铁氧体磁体可由该方法通过在磁场下简单地成型粉末并烧结容易地制造。

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