发明名称 |
PROCESS FOR PRODUCING MAGNETIC METAL PARTICLES FOR MAGNETIC RECORDING, AND MAGNETIC RECORDING MEDIUM |
摘要 |
The present invention relates to a process for producing magnetic metal particles for magnetic recording, comprising: heat-treating goethite particles having an aluminum content of 4 to 50 atom % in terms of Al based on whole Fe to obtain hematite particles; and heat-reducing the hematite particles at a temperature of 200 to 600° C., the goethite particles being obtained by adding a peroxodisulfate to a reaction solution comprising: a ferrous salt aqueous solution and a mixed alkali aqueous solution comprising: an alkali hydrogen carbonate aqueous solution or alkali carbonate aqueous solution and an alkali hydroxide aqueous solution before initiation of an oxidation reaction of the reaction solution, and then conducting the oxidation reaction.
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申请公布号 |
US2012042750(A1) |
申请公布日期 |
2012.02.23 |
申请号 |
US201113285035 |
申请日期 |
2011.10.31 |
申请人 |
OHSUGI MINEKO;HARADA TOSHIHARU;MATSUO TAKAHIRO;YAMAMOTO YOSUKE;HAYASHI KAZUYUKI;TODA KOGYO CORPORATION |
发明人 |
OHSUGI MINEKO;HARADA TOSHIHARU;MATSUO TAKAHIRO;YAMAMOTO YOSUKE;HAYASHI KAZUYUKI |
分类号 |
B22F9/20 |
主分类号 |
B22F9/20 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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