Four PTFE/PI-PAI coatings filled with different contents of VN were designed to improve the tribological properties of engine bearing bush. These composite coatings were prepared on copper alloy substrates by liquid spraying. The tribological properties of these coatings at different temperatures and different lubrication ways were studied. Results show that the wear mechanisms of these coatings under dry sliding wear are transformed from adhesive wear at room temperature to abrasive wear at high temperatures under 8 wt% and 12 wt% VN. The coating under 4 wt% VN has the best wear resistance. As the content of VN exceeds 8 wt%, the hardness and tribological properties of these polymer coatings are decreased due to the agglomerated materials. The CoFs (coefficients of friction) of these composite coatings under 0 wt% VN and 4 wt% VN at 150 °C are lower than those at room temperature. On the contrary, as the VN exceeds 8 wt%, these CoFs under high temperature are higher than those at room temperature. The wear rate of the composite coating under 4 wt% VN increases with the temperature under oil lubrication. However, the wear rates of these coatings under dry sliding wear show a trend of first decrease and then increase with temperature. The non-uniformly softened polymers and VN, agglomeration of large particle materials, and the characteristics of oil viscosity under rising temperature and different frictional contact are the main reasons.

设计了四种填充不同VN含量的PTFE/PI-PAI涂层，以改善发动机轴瓦的摩擦学性能。这些复合涂层是通过液体喷涂在铜合金基材上制备的。研究了这些涂层在不同温度和不同润滑方式下的摩擦学性能。结果表明，这些涂层在干滑动磨损下的磨损机制已从室温下的粘着磨损转变为在 8 wt% 和 12 wt% VN 下的高温下的磨粒磨损。4 wt% VN以下的涂层具有最好的耐磨性。当 VN 的含量超过 8 wt% 时，这些聚合物涂层的硬度和摩擦学性能会因材料团聚而降低。这些复合涂层在 0 wt% VN 和 4 wt% VN 在 150 °C 下的 CoFs（摩擦系数）低于室温。相反，当VN超过8 wt%时，这些高温下的CoFs高于室温下的。4 wt% VN下复合涂层的磨损率随着油润滑温度的升高而增加。然而，这些涂层在干滑动磨损下的磨损率随温度呈先下降后上升的趋势。聚合物和VN的不均匀软化、大颗粒材料的团聚、升温下油品粘度的特性和不同的摩擦接触是主要原因。这些高温下的 CoF 比室温下的高。4 wt% VN下复合涂层的磨损率随着油润滑温度的升高而增加。然而，这些涂层在干滑动磨损下的磨损率随温度呈先下降后上升的趋势。聚合物和VN的不均匀软化、大颗粒材料的团聚、升温下油品粘度的特性和不同的摩擦接触是主要原因。这些高温下的 CoF 比室温下的高。4 wt% VN下复合涂层的磨损率随着油润滑温度的升高而增加。然而，这些涂层在干滑动磨损下的磨损率随温度呈先下降后上升的趋势。聚合物和VN的不均匀软化、大颗粒材料的团聚、升温下油品粘度的特性和不同的摩擦接触是主要原因。