Dowa Mining Co., Ltd.

Akito Inoue

Kenichi Inoue

Kazushi Sano

Seiichi Hisano

Kazuhisa Saito

Hiroshi Miyazawa

Akio Sawabe

There is provided a composite plated product which has a large content of carbon and a large quantity of carbon particles on the surface thereof and which has an excellent wear resistance, by sufficiently dispersing carbon particles in a silver plating solution without using any additives such as dispersing agents and without coating the surface of carbon particles. A wet oxidation treatment for carbon particles is carried out by adding an oxidizing agent to water in which the carbon particles are suspended, and the carbon particles treated by the wet oxidation treatment are added to a cyanide containing silver plating solution for electroplating a substrate to form a coating of a composite material, which contains the carbon particles in a silver layer, on the substrate.

Composite plated product and method for producing same

A ferromagnetic powder containing iron as the principal component and containing more than 5 to 50 at. % Co, 0.1 to 30 at. % Al, 0.1 to 10 at. % of a rare earth element inclusive of Y, 0.05% by weight or less of an element belonging to Group 1 of the Periodic Table, and 0.1% by weight or less (inclusive of 0% by weight) of an element belonging to Group 2 of the Periodic Table, the powder comprising flat acicular particles having a mean major axis length of 0.01 to 0.40 &mgr;m and a crystallite diameter as determined by X-ray diffraction (Dx) of 50 to 250 angstrom, provided that the cross section diameter in the minor axis direction cut perpendicular to the major axis has a larger width and a smaller width, and that this cross section ratio in the minor axis direction, which is a larger width to smaller width ratio, uniformly yields a value of greater than 1, preferably 1.5 or higher, and the powder yielding a &sgr; /Dx ratio of 0.7 or higher, wherein, &sgr; represents the saturation magnetization and Dx represents the crystallite size determined by X-ray diffraction.

Ferromagnetic powder

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Honjo, Japan

Akito Inoue