响应面法对一种新型摩擦材料的性能优化及其磨损机理

Optimization of Tribological Properties and Its Wear Mechanism of a New Type Friction Materials with Response Surface Methodology

采用响应面法结合Design-Expert软件对一种有机高摩擦复合材料进行研究,在MMS-2A摩擦磨损试验机上测试材料的摩擦性能,并建立制备工艺参数与摩擦因数、比磨损率之间的二次回归模型。结果表明:二次回归模型的预测值与实验值之间的相关性可达91.97%与87.85%,具有较好的拟合精度;热压工艺中成型温度与成型时间具有显著的交互作用。通过金相显微镜、SEM、3D激光共聚焦显微镜、洛氏硬度计等对磨损表面进行形貌观察和磨损机理分析,发现成型压力、成型温度与成型时间影响复合材料的界面性能,致使摩擦材料表现出不同的摩擦磨损特性。由响应面法结合磨损机理分析得到该材料制备的最优工艺参数为:成型压力19~25MPa,成型温度165~174℃,成型时间18~22min。

Preparation technology of an organic high friction composite materials was optimized by RSM(response surface methodology)and Design-Expert software.The friction tests were performed by MMS-2A friction tester.The quadratic regression model was established between process parameters and friction coefficient and wear rate.The results show that the correlation between predictive value and test value of the quadratic regression models has good fitting precision which are 91.97%and 87.85%respectively.There is strong interaction between molding temperature and holding time in the hot-pressing technology.Macro and micro surface morphologies were observed by the metallurgical microscope,scanning electron microscope,3D measuring laser microscopy and hardness tester.The interfacial properties of the composites are affected by hot pressing process,which determine the tribological properties of composites.The optimum process parameters can be optimized by response surface methodology with the analysis of the wear mechanism,and the optimum hot pressing process are 19-25MPa,165-174℃,18-22min.