Microstructure and Wear Resistance of WS2/W Composite Coating on TC4 Titanium Alloy Surface

Abstract

Abstract In order to achieve the demand for improving the wear resistance of titanium alloy surfaces, a combination of magnetron sputtering (PVD), chemical vapor deposition (CVD) and thermal vulcanization methods is used to prepare highly wear-resistant WS2/W Composite coating on the surface of TC4 titanium alloy. Scanning electron microscope (SEM), X-ray diffractometer (XRD) and X-ray energy dispersive spectrometer (EDS) were used to characterize the micro-morphology, microstructure and chemical composition of the composite coating. The micro-hardness and wear resistance of the composite coating were tested. The results show that the thickness of each layer of the WS2/W composite coating prepared by the experiment is about 16μm and 60μm respectively, the coating structure is dense, and the interface between the layers is obvious. The average micro-hardness of WS2 layer and W layer are 110.4HV and 740.1HV respectively. The surface friction factor of WS2/W composite coating is 0.15, which is about 18% of the matrix (0.85). The wear rate is 1.184 × 10-6mm3·mm-1, which is about 45% of the substrate (1.628 × 10-6mm3·mm-1), which has better wear resistance and anti-friction characteristics.