Process of producing multilayer-coated composite powder
AssigneeNihon Kogyo Kabushiki Kaisha
InventorsYoshio Kawasumi, Mitsuo Takahashi
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Abstract
A multilayer-coated composite powder is produced by a first step of treating a core powder to be coated with first metallic ions and a metallic powder for reducing the first ions and thereby forming a single-layer coated powder, and a second step of treating the single-layer-coated powder with either only second metallic ions other than the first metallic ions or the second ions in the presence of a metallic powder for reducing the second ions. Where necessary, the second step is repeated the number of times required for forming a predetermined number of coating layers.
Claims9
A process for producing a multilayer-coated composite powder, which comprises a first step of coating treating a starting core powder with first metallic ions and a metallic powder for reducing the first ions to thereby forming a single-layer coated powder by cementation reaction, a second step of coating treating the single-layer coated powder either with only second metallic ions other than said first metallic ions or with said second ions in the presence of a metallic powder for reducing said second ions to form a double-layer coated powder by cementation reaction, and, where necessary, an additional step of steps for repeating said second step according to the number of coating layers required.
Dependencies are inferred from the claim text.