The effect of SiC particle size on the properties of Cu–SiC composites

Abstract

SiC particulate-reinforced copper composites were prepared by powder metallurgy (PM) method and conventional atmospheric sintering. Scanning electron microscope (SEM), X-ray diffraction (XRD) techniques were used to characterize the sintered composites. The effect of SiC content and particle size on the relative density, hardness and electrical conductivity of composites were investigated. The relative densities of Cu–SiC composites sintered at 700°C for 2h are ranged from 97.3% to 91.8% for SiC with 1μm particle size and from 97.5% to 95.2% for SiC with 5μm particle size. Microhardness of composites ranged from 143 to 167HV for SiC having 1μm particle size and from 156 to 182HV for SiC having 5μm particle size. The electrical conductivity of composites changed between 85.9% IACS and 55.7% IACS for SiC with 1μm particle size, between 87.9% IACS and 65.2% IACS for SiC with 5μm particle size.