发明名称 |
Manufacture of acicular ferromagnetic iron particles |
摘要 |
A process for the manufacture of acicular ferromagnetic iron particles by heating a goethite, provided with a shape-stabilizing surface coating, at 250 DEG -450 DEG C. in an atmosphere containing water vapor at a partial pressure of not less than 30 mbar, to give alpha-iron(III) oxide, and reducing this material with hydrogen at 275 DEG -425 DEG C., and the use of the iron particles thus obtained as magnetic material in the production of magnetic recording media.
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申请公布号 |
US4344791(A) |
申请公布日期 |
1982.08.17 |
申请号 |
US19800174267 |
申请日期 |
1980.07.31 |
申请人 |
BASF AKTIENGESELLSCHAFT |
发明人 |
STECK, WERNER;SARNECKI, WILHELM;MAROSI, LASZLO;OHLINGER, MANFRED;LOESER, WERNER |
分类号 |
G11B5/706;B22F9/22;C09D5/23;C09D7/12;H01F1/06;(IPC1-7):C22B5/12;C22C1/04 |
主分类号 |
G11B5/706 |
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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