SILVER-COATED COPPER POWDER AND ITS MANUFACTURING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a silver-coated copper powder which has excellent electric conductivity and hardly causes deterioration with age in electric conductivity even if allowed to stand in the open atmosphere and also to provide its manufacturing method. SOLUTION: The silver-coated copper powder in which a silver layer is formed on the surface of copper powder, is characterized in that the relationship between the product X (where 0.1≤X≤150 is satisfied) of the weight percent of silver in the silver-coated copper powder and the weight cumulative particle diameter D50by laser diffraction/scattering type particle size distribution measurement and the L* by the color difference measurement of the silver-coated copper powder satisfies (63+0.35X-2×10-3X2)-L*≤0. COPYRIGHT: (C)2004,JPO