Research On Fretting Wear Of TC11and Surface Modified Layers In Seawater And High Temperature Conditions

Application of surface modification is expected to be an ideal solution to mitigate frettingdamage. In this study, different surface modification experiments were used on Titanium alloyTC11to obtain MAO coating, N ion implanted layer and DLC multilayers film. Phasecomposition and microstructure were examined by using X-ray diffracmeter (XRD), Ramanspectroscopy, scanning electron microscopy (SEM) and Energy Dispersive Spectrometer(EDS). Fretting wear performances of TC11and three kinds of surface modification layers insimulated seawater/pure water and high temperature/room temperature environment werestudied on the SRV-IV fretting wear machine. And effects of modification on the frictioncoefficient, wear resistance and abrasion mechanism were investigated.Results show that with the application of these surface modifications, the fretting wearresistances are improved. MAO coating has rough and porous surface, which is mainlycomposed of anatase and rutile TiO2phase. There is a higher coefficient of friction at thebeginning for its surface characteristics. Hardness of Ion implantation modified layer increasessignificantly. Furthmore, the strengthen effect and compressive stress are beneficial to enhancethe anti-fretting Properties. DLC multilayer films with high hardness and good binding forcecan effectively shield TC11from seawater and oxygen, so that it can inhibit the corrosion andoxidation wear. It is indicated that modified layers could cause the decrease of frictioncoefficient and wear volume compared with TC11. The reductions of wear volume are obvious,and the defending effect of DLC multilayer film is most outstanding. Especially, the frictioncoefficient in seawater is significantly lower than that of pure water. It is worth mentioned thatwear reduction of TC11in seawater compared with in pure water, which suggests that there’s anegative interaction for Titanium between corrosion and wear. However, wear volumes ofmodified layers are slightly higher than the values in pure water. And all that wear volumes ofmodified layers in high temperature are slightly higher than that of room temperature.