PRODUCTION OF PALLADIUM COATED SILVER POWDER

摘要

PURPOSE: To provide a method for producing palladium coated silver powder, by which particle diameter can be arbitrarily controlled while keeping sharp particle size distribution. CONSTITUTION: A mixture of L-ascorbic acid with a hydrazine compd. is added as a reducing agent to an aq. soln. of silver-ammine chloride having >=10g/l concn. of ammonium chloride, silver particles are formed at 30-70 deg.C and the objective palladium coated silver powder is obtd. by coating the silver particles with palladium. The particle size distribution can be controlled to the range of 0.3-1.0μm.