Process of producing composite powder coated with noble metal
AssigneeNihon Kogyo Kabushiki Kaisha
InventorsYoshio Kawasumi, Mitsuo Takahashi
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Abstract
Composite powder coated with a noble metal is produced by adding a powder of a metal or alloy baser than the noble metal to a powder of a metallic sulfide, carbon, activated charcoal, metallic carbide, or metallic oxide, and then adding to the resulting mixture a solution containing the noble metal with stirring. The particles of the composite powder are coated with the noble metal that results from a cementation reaction.
Claims11
A process of producing a composite powder coated with a noble metal, which comprises adding a powder of a metal or alloy baser than the noble metal to a starting powder of a metallic sulfide, carbon, activated charcoal, metallic carbide, or metallic oxide, and then adding to the resulting mixture a solution containing said noble metal with stirring, whereby said starting powder particles are coated with said noble metal that results from a cementation reaction.
A process of producing a composite powder coated with a noble metal comprising the steps of:
- providing preliminarily granulated and sized starting powder of a metallic sulfide, carbon, activated charcoal, metallic carbide or metallic oxide,
- mixing the starting powder with powder of a metal or alloy baser than the noble metal, and
- adding to the mixture produced solution containing said noble metal in such manner that the funicular (II) region is reached in about 20 seconds to 10 minutes and then the slurry region is reached in 5 to 10 seconds,
- whereby the starting powder particles are coated with noble metal that results from a cementation reaction.
Dependencies are inferred from the claim text.