Study on Modification of Boron Carbide Particles for Reinforced Copper Matrix Composites

摘要

The method of vaporizing plating a containing titanium metal coating on B_4C particles was introduced and the B_4C particles reinforced copper matrix composites were fabricated by powder metallurgy. The microstructure of the coating and the interface of composite were investigated based by X-ray diffraction, DSC and SEM etc. The experimental results showed that the microstructure of surface layer of coated B_4C particles was B_4C→TiB_2→TiN in turn from inner to outer surface. Differential Thermal Analysis (DTA) indicated that the new phase appeared on the surface of B_4C_p after coating. Thermogravimetry Analysis (TGA) showed that the thermal stability of B_4C_p after coating was higher than that before coating. The density, conductance and wear resistance of the coating particles reinforced composite were better than that of the uncoated particles reinforced composite. The interface and worn surface of composites were observed and analyzed. The results indicated that the coating modification of B_4C particles significantly improved the interfacial bonding property of composite. The wettability between the particles and matrix was good.