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采用模压法在 TiNi 合金表面获得了微凹坑织构,通过织构几何参数的变化调控材料的摩擦学性能。结果表明,周向和径向间距增大,TiNi 合金的摩擦系数和比磨损率均呈现先减小后增大的趋势,而深/径比逐渐增大,使得 TiNi 合金的摩擦系数和比磨损率呈现先增大后减小的趋势。滑动速度增加,TiNi 合金试盘的摩擦系数几乎都呈现先减小后增大的趋势,与 Stribeck 曲线描述的一致。织构参数微坑深/径比为 0.06,径向间距为 1.5 mm,周向间距为 15°时,表现出较优的摩擦学性能,摩擦系数为 0.098,比磨损率为 0.87 × 10-5mm3/(N·m)。由此可见,合适的织构参数和形貌可以降低摩擦系数和减小磨损,因为摩擦过程中微坑会产生动压和捕捉磨屑而减少表面损伤,增强耐磨性。
Micro-dimple texture was obtained on the TiNi alloy surface by embossing method, and the tribological properties of the TiNi alloy were controlled by the change of texture geometric parameters. The results show that the friction coefficient and specific wear rate of TiNi alloy first decrease and then increase with the increase of circumferential and radial spacing, and the ratio of depth to diameter increases gradually, which makes the friction coefficient and specific wear of TiNi alloy Rate showed the first increase and then decrease. With the increase of sliding velocity, the friction coefficient of TiNi alloy test plate tends to decrease firstly and then increase, which is consistent with the description of Stribeck curve. The texture parameters of micro-pit depth / diameter ratio of 0.06, the radial spacing of 1.5 mm, the circumferential spacing of 15 °, showed excellent tribological properties, the friction coefficient of 0.098, the specific wear rate of 0.87 × 10-5mm3 / (N · m). Thus, the appropriate texture parameters and morphology can reduce the friction coefficient and reduce wear and tear, because the micro-pits during the friction will produce dynamic pressure and capture debris to reduce surface damage and enhance wear resistance.