乏油环境下氧化铝填充氟橡胶的高温摩擦性能研究

Study on High Temperature Friction Properties of Fluorine Rubber Filled with Alumina in Oil-Deficient Environment

为了探究高温乏油环境下氟橡胶(FKM)摩擦性能的变化规律并改善其摩擦性能,在FKM中加入氧化铝(Al_(2)O_(3)),通过机械共混法制备得到FKM/Al_(2)O_(3)复合材料,在常温和200℃高温乏油环境下对比分析FKM/Al_(2)O_(3)复合材料与FKM材料在不同载荷下的摩擦学性能。结果表明:高载荷和高温使得FKM的摩擦因数、粗糙度和磨痕深度增大,因而乏油环境下FKM的摩擦性能大幅下降;Al_(2)O_(3)粒子的加入提高了FKM在常温和高温下的基体硬度,使得FKM/Al_(2)O_(3)复合材料在相同条件下相比FKM的摩擦因数、粗糙度和磨痕深度均有减小;Al_(2)O_(3)作为补强材料提高了FKM基体在高温乏油环境下的摩擦性能,复合材料表面分层剥离现象明显减少。复合材料表面元素分析结果表明,Al_(2)O_(3)粒子在FKM表面形成了固体润滑膜,改善了FKM在高温乏油环境下的摩擦性能。

In order to explore the change law of friction properties of fluorine rubber(FKM)under high temperature and oil-deficient environment and improve its friction properties,alumina(Al_(2)O_(3)) was added into FKM,and FKM/Al_(2)O_(3) composites were prepared by mechanical blending method.The tribological properties of the FKM/Al_(2)O_(3) composites and FKM under different loads were compared and analyzed under the oil-deficient environment at normal temperature and 200 ℃ high temperature.The results show that the addition of Al_(2)O_(3) particles improves the matrix hardness of FKM at normal temperature and high temperature,therefore the friction coefficient,roughness and wear scar depth of FKM/Al_(2)O_(3) composites were reduced under the same conditions compared with FKM.Al_(2)O_(3) as reinforcing material improves the friction performance of FKM matrix in high temperature and oil-deficient environment,and the delamination phenomenon of composite surface is obviously reduced.The results of surface element analysis of the composites show that a solid lubricating film is formed by Al_(2)O_(3) particles on the FKM surface,which improves the friction performance of FKM in the environment of high temperature and oil-deficient.