【摘要】 为提高钛合金的摩擦学性能,采用激光加工技术在Ti6Al4V合金表面分别构建间距为100和300μm的网格和点阵微结构,将SiO₂纳米粒子涂覆在微结构上制备微纳结构。用接触角测量仪测量试样的表面接触角和滚动角;用LEXT OLS4000 3D激光共聚焦显微镜进行表面形貌和磨痕表征,采用多功能摩擦磨损试验机（UMT）进行摩擦学性能测试。结果表明,具有微结构的表面是符合Wenzel状态的疏水表面,涂覆SiO₂具有微纳结构的表面是符合Cassie状态的超疏水表面。微结构间距100μm的表面的疏水性强于300μm,网格表面疏水性强于点阵。随表面疏水性能的增强,磨痕深度变浅。在50 m N载荷条件下,涂覆SiO₂表面的摩擦系数约为激光加工表面的0.6倍,网格表面的摩擦系数约为点阵的0.8倍。在5 N载荷条件下,涂覆SiO₂减小摩擦系数曲线的波动性。更多还原

【Abstract】 In order to improve the tribological properties of titanium alloy,laser processing was used to build grid and dot micro-structure with spacing of 100 and 300 μm on Ti6A14 V alloy surface.Nano-SiO₂ powders were coated on the micro-structures to build micro-nano structures.The contact angles and roll angles were measured by contact angle measurement.The micrograph and wear tracks were investigated by LEXT OLS4000 3D microscope.Tribological performance was evaluated by CETR Universal Micro-Tribometer（UMT）.The results show that the micro structure surface is in hydrophobic state that is in accordance with the Wenzel model,while the surface with the micro-nano structure formed by coating the nano-SiO₂ is in super hydrophobic state that is in accordance with the Cassie model.The hydrophobic performance of micro-structure surface with spacing of 100 μm is stronger than that of 300 μm,and the hydrophobic performance of grid surface is stronger than that of dot surface.As the hydrophobic performance improves,the depth of the grinding crack becomes shallower.When the load is 50 mN,the friction coefficient of the surface coated with SiO₂ is about 0.6 times of that of laser processing surface,and the friction coefficient of the grid surface is about 0.8 times of that of dot surface.When the load is 5 N,coating SiO₂ can reduce the volatility of the friction coefficient curve.更多还原