不同润湿性钛合金表面在不同介质中的摩擦学行为∗

摘要

采用低表面能修饰和涂覆SiO2,制备具有不同润湿性的 Ti6Al4V表面。采用 HSR-2M高速往复摩擦试验机探讨其在水(蒸馏水)、海水(人工配制)和油(十六烷)介质中的摩擦学行为。结果表明,低表面能修饰或涂覆SiO2均使Ti6Al4V表面由亲水变为疏水,但涂覆SiO2可获得更大的接触角和小的滚动角,且更加显著地减小摩擦系数和磨损量(体积)。水、海水和油介质中,摩擦系数分别减小13％,14％和23％,磨损量分别减小65％,24％和76％。试样在油中的摩擦系数和磨损量最小,在海水中的摩擦系数小于水,磨损量大于水。增大摩擦速度可减小摩擦系数和磨损量。%Ti6Al4V alloy surface with different wettability was built by modification with low surface energy and coating Nano-SiO2 powders.Tribological performance was studied by SR-2M high speed reciprocating friction test machine in water (distilled water),seawater (artificial),and oil (hexadecane).It is shown that Ti6Al4V alloy surface can change from hydrophilic to hydrophobic by low surface energy modification or coating nano-SiO2 powders,while the surfaces coated nano-SiO2 contact angles and smaller roll have greater angles,and re-duce the friction coefficient and wear loss (volume)more significantly.Friction coefficients reduced by 1 3%, 14% and 23%,and wear losses (volume)reduced by 65%,24% and 76% respectively in water,seawater,and oil.Specimen in oil has the smallest friction coefficient and wear loss.The friction coefficient of specimen in sea-water is smaller than that in water while the wear loss has the opposite phenomena.Friction coefficients and wear losses decrease as the increment of the friction velocity.