舰船螺旋桨轴与轴承之间不良的润滑状态会导致严重磨损和异常噪声，对其可靠性和隐身性带来隐患。文中选取表面润湿性不同的聚四氟乙烯（PTFE）和聚甲醛（POM）在6 种工况水环境下进行环-块摩擦试验，分析其摩擦学特性。使用带有高精度振动加速度传感器的摩擦试验装置采集其振动信号，通过小波包分解和重解对信号特征进行增强，拉曼光谱表征试验前后材料摩擦面的分子结构。结果表明，高载荷下PTFE比磨损率随转速增大呈现线性变化，POM则出现显著的指数变化；材料在摩擦前后的表面均未发生化学变化，铜环没有擦伤和转移到材料表面；POM在低转速下的摩擦振动更大，高转速下则相反；转速达到1000 r/min时，POM产生了稳定的水膜，显示了良好的水润滑效果。
Poor lubrication between the ship's propeller shaft and the bearing causes serious wear and abnormal noise, which brings danger to its reliability and stealth. In this paper, polytetrafluoroethylene (PTFE) and polyoxymethylene (POM) plastics with different surface wettability were selected to conduct ring-block friction test under six working conditions in water environment to analyze their tribological characteristics. The vibration signal was collected by the friction test device with the high- precision vibration acceleration sensor, and the signal characteristics were enhanced by wavelet packet decomposition and reorganization. The molecular structure of the friction surface of the materials before and after the test was characterized by Raman spectrum. The results show that the specific wear rate of PTFE under high load changes linearly with the increase of speed, while POM shows a significant exponential change. There is no chemical change on the surface of the materials after friction, and the copper rings are not scratched and transferred to the surface of the materials. Compared with PTFE, the frictioninduced vibration of POM is more severe at low speed and slighter at high speed. When the speed reaches 1000 r/min, the stable water film exists on the surface of POM, which shows good water lubrication.
刘吟松, 帅长庚, 陆 刚, 杨 雪, 汪 鑫.不同表面润湿性水润滑材料的摩擦特性[J].高分子材料科学与工程,2022,38(7):111-120.复制