【摘要】 为探究织构在人工关节表面生物陶瓷涂层材料领域的应用效果,基于平均流量模型建立了椭圆形和圆形织构表面在混合润滑状态下的润滑计算模型,采用有限差分法结合数值迭代并通过Matlab编程对模型进行计算求解,得到计算域内的压力分布和织构表面的理论摩擦系数,以此作为织构表面摩擦学性能的判断标准进行比较分析。采用飞秒激光工艺在等离子喷涂HA/ZrO₂生物涂层表面制备了面覆率均为10%的圆形织构和不同排布方式的椭圆形织构,并在UMT-3摩擦磨损试验机上进行往复摩擦试验。结果表明:在HA/ZrO₂生物陶瓷涂层表面制备一定参数的织构阵列,可有效减小其摩擦系数,且长轴平行于上表面运动方向的椭圆形织构能产生更多的额外承载力,具有较优的减磨和抗摩效果。更多还原

【Abstract】 In order to explore the application effect of texture on the surface of bioceramic coating materials of artificial joint, the lubricating calculation model of the elliptical and circular textured surfaces in the mixed lubrication condition was established based on the average flow model, the finite difference method combined with numerical iteration was used and the model was solved through Matlab programming, thus the pressure distribution in the calculation domain and the theoretical friction coefficient of the textured surface were obtained, which can be used as the judgment standard of tribological properties of the texture surface. A femtosecond laser process was used to prepare a circular texture with a surface coverage of 10% and an elliptical texture with a different arrays on the HA/ZrO₂ bio-coating layer sprayed by plasma, and reciprocating friction test was performed on a UMT-3 friction and wear tester. The results show that a certain parameter texture array on the surface of HA/ZrO₂ bioceramic coating can effectively reduce the friction coefficient, and the elliptical texture with its long axis parallel to the movement direction of the upper surface can generate more additional bearing capacity which performde best on wear resistance.更多还原