发明名称 |
Process for producing magnetic metal powder and coating for magnetic recording medium |
摘要 |
A magnetic metal powder, having a large specific surface are, a high coercive force, a high dispersibility and an excellent corrosion resistance, is produced by converting an aciculate goethite having a silicon and/or aluminum compound layer formed thereon or an aciculate goethite modified with a metal other than iron into magnetite, forming thereon a nonferrous transition metal compound layer, further forming thereon a silicon or aluminum compound layer, and reducing the coated magnetite to prepare a magnetic metal powder mainly composed of iron and having on the surface thereof a layer containing a nonferrous transition metal element, characterized in that the formation of the silicon and/or aluminum compound layer on the aciculate goethite and/or the formation of the nonferrous transition metal layer on the magnetite are conducted while conducting dispersion by means of a disperser.
|
申请公布号 |
US5185093(A) |
申请公布日期 |
1993.02.09 |
申请号 |
US19910674910 |
申请日期 |
1991.03.26 |
申请人 |
KAO CORPORATION |
发明人 |
ICHIKAWA, HIROAKI;KADONO, YASUO;KOJIMA, KATSUO;NAKAMURA, HIROYUKI;AOKI, YOSHIO |
分类号 |
B22F9/22;G11B5/706;G11B5/712;G11B5/84;H01F1/06 |
主分类号 |
B22F9/22 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|