碳纤维增强摩擦材料的摩擦表面层

利用D-MS摩擦磨损试验机研究了碳纤维增强摩擦材料的摩擦磨损性能,并利用扫描电镜和能谱仪对其表面结构和微区成分进行了观察和测定,对热重分析试验的结果和摩擦磨损性能试验的结果进行了分析。结果表明:碳纤维摩擦材料在100～300℃内随温度升高摩擦磨损性能无明显降低,摩擦因数有所提高。碳纤维摩擦材料摩擦表面可分为富铁层、热力疏松层、变形强化层三层。摩擦表面工作层对材料表面获得稳定的摩擦磨损性能起重要作用。碳纤维的高导热性对材料的摩擦表面层结构有重要影响,它有利于减少热影响表面层深度,在本试验条件下,摩擦热影响表面层的深度约为0.55mm。

Friction surface layer of carbon fiber reinforced friction material

The friction and wear behaviors of the carbon fiber reinforced friction material(CFRFM) were investigated using a D-MS tester.The microstructures and constitutions of the CFRFM surface layer were measured using scanning electronic microscope and energy dispersive spectroscopy respectively;and their influence factors were analyzed according to the experiment results of thermo gravimetric analysis and tribological properties.The experimental results showed that the tribological properties of CFRFM do not reduce evidently,and friction coefficient has a small amount of increase during temperature rising from 100 to 300 ℃.The surface of CFRFM consists of three layers: iron-rich layer,which plays an important role in improving tribological properties of the material surface,thermodynamic loosened layer,and deformation reinforced layer.High heat conductivity,favorable to decrease the depth of the heat affected layer on the friction surface,has an important effect on the surface structure of CFRFM,under present experimental conditions,the depth of the heat affected layer is about 0.55 mm.