发明授权
- 专利标题: Highly magnetic iron oxide powder
- 专利标题(中): 高磁性氧化铁粉末
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申请号: US928230申请日: 1986-11-06
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公开(公告)号: US4822509A公开(公告)日: 1989-04-18
- 发明人: Jeries I. Bishara , Anthony J. Vaccaro , Eric J. Rudd
- 申请人: Jeries I. Bishara , Anthony J. Vaccaro , Eric J. Rudd
- 申请人地址: FL Boca Raton
- 专利权人: ELTECH Systems Corporation
- 当前专利权人: ELTECH Systems Corporation
- 当前专利权人地址: FL Boca Raton
- 主分类号: C01G49/02
- IPC分类号: C01G49/02 ; G11B5/706 ; C01G49/06
摘要:
A highly magnetic isotropic iron oxide powder with a uniform particle size distribution and particle size in the range from 0.005 to 0.2 micrometer consists of a mixed iron oxide exhibiting gamma (Fe.sub.2 O.sub.3) and ferrite (Fe.sub.3 O.sub.4) structure, having the empirical formula Fe.sub.72-x O.sub.96, where x has a value between 2 to 7, an aspect ratio of at most 2:1 and a temperature coefficient of coercivity of less than -0.7% per degree Celcius. The mixed oxide is optionally a cobalt-modified mixed iron oxide containing 2-6% by weight of cobalt and is obtained by heating ultrafine, ferrite particles in a controlled, oxidizing atmosphere at a temperature of 240.degree. C. to 320.degree. C. for a period of one to three hours.
公开/授权文献
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