Effect of TiB₂ particle size on the material transfer behaviour of Cu–TiB₂ composites

Abstract

Cu-5.8vol.-%TiB 2 composites reinforced with different sized TiB 2 particles were prepared by spark plasma sintering (SPS). The arc erosion resistance was examined using a JF04C electrical contact instrument. The results indicate that the TiB 2 particle size and contact currents have important effects on the material transfer mode. Both lower mass loss and relative mass transfer was observed in the Cu-5.8vol.-%TiB 2 composites reinforced with fine TiB 2 particles (10 um, 30 um) compared to those with coarse TiB 2 particles (70 um, 110 um). The investigation and analysis of the microstructure and arc erosion mechanism show uniform distribution of fine TiB 2 particles in the copper matrix can significantly improve the viscosity of the molten pool and decrease the splashing of molten Cu.