Patent ID: 8481115
Filing Date: 2013-07-09
Classification: B22F,C22C,Y10T

Abstract:
1. A method for producing coated, fine metal particles each having a Ti oxide coating and a silicon oxide coating formed in this order on a metal core particle comprising the steps of mixing powder comprising TiC and TiN with oxide powder of a metal M meeting the relation of ΔG M-O >ΔG TiO2 , wherein ΔG M-O represents the standard free energy of forming an oxide of the metal M; heat-treating the resultant mixed powder in a non-oxidizing atmosphere to reduce said oxide of the metal M with said powder comprising TiC and TiN, while coating the resultant metal M particles with Ti oxide; coating the Ti-oxide-coated surface with silicon oxide; and classifying the resultant particles such that they have a median diameter d50 of 0.4-0.7 μm, and a variation coefficient (=standard deviation/average particle size) of 35% or less, which indicates a particle size distribution range.