Microstructure and wear resistance of Ti-based composite coating reinforced by in-situ synthesized TiC and TiB₂ particulates on surface of Ti6Al4V alloy with arc cladding

Ti-based composite coating reinforced by in-situ synthesized TiC and TiB₂ particulates was prepared with prealloyed powder of B4 C and Ni60 A on the surface of Ti6Al4 V alloy by means of argon arc cladding. The microstructure was examined by using X-ray diffraction and scanning electron microscope. The microhardness of composite coating was measured using the microhardness meter and the wear resistance was analyzed using the wear testing machine in the condition of dry sliding wear at room temperature. The results show that the main phases in the coating were TiC and TiB₂. The TiC and TiB₂ particles distributed uniformly. The size of TiC was about 2-3 μm and that of TiB₂ was 3-5 μm. The microhardness of the coating was about HV1200. The wear resistance of composite coating was improved about 20 times, compared with that of Ti6Al4 V alloy substrate in the condition of dry sliding wear at room temperature.