| 摘要 |
PURPOSE:To obtain a magnetic powder having good dispersion properties and uniform magnetic characteristics by covering a scaled powder having a specific grain diameter and a small specific gravity with an iron alloy. CONSTITUTION:By adjusting the particle size distribution of a scaled powder such as mica, mica-like iron oxide or alumina flakes, the grain diameter is made to be 1-100mum. If the grain diameter is less than 1mum, the cohesion becomes large, and if larger than 100mum, the smoothness disappears. After this scaled powder is dispersed into water and activated with palladium chloride using an electroless plating method, it is moved into a mixed water solution in which predetermined amounts of salts of iron, nickel and cobalt are dissolved, and a reducing agent is added. Thus, the scaled powder surface is covered with 10-80 wt.% of iron-nickel or iron-cobalt alloy in which iron occupies 10-90 wt.% of the alloy. If the magnetic powder obtained is changed to a paint, good dispersion properties and uniform magnetic characteristics are obtained.
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