半金属摩擦材料与灰铸铁滑动摩擦表面层特性的分析研究

半金属摩擦材料具有摩擦系数稳定，耐磨性好，对环境污染小和对偶件表面损伤小等优点，但其在摩擦热和界面应力等因素作用下，表层会发生弹性变形，塑性变形，元素扩散，组分转移和摩擦化学反应等现象，因此，利用扫描电子显微镜Ｘ射线能量色散谱和差热－热重分析，对铜纤维增强的半金属摩擦材料与灰铸铁滑动摩擦表面层的特性作了分析研究，考察了表面层特性对摩擦损行为的影响。结果表明，在给定的试验条件下，半金属摩擦材料摩擦表

Study on Worn Surface Layers of the Friction Pair Consisting of Semimetallic Friction Materials and Grey Cast lron

Semimetallic friction materials are a new kind of engineering materials which deserveto be developed.They have many advantages,such as stable friction coefficient,excellent wear-resistance,little environmental pollution and little damage to counterpart. But,the action offriction heat,interface stress and some other factors make elastic deformation,element diffusionand ingredient transfer take place in worn surface layers.Thereforce,the characteristics of wornsurface layers of the sliding friction pair consisting of the semimetailic friction material reinforcedwith brass fibers and grey cast iron were investigated , and the influences of worn surface layers onfriction-wear behavior were analyzed by scanning electron microscope(SEM),energy dispersiveanalysis of X-ray(EDX) and differential thermal analysis-thermogravimetric analysis( DTA-TGA). The results showed that under the given experimental conditions,the surface layer with richiron and poor copper was formed in the surface worn region of the semimetallic friction material,the depth of organic ingredient pyrolysis caused by friction heat in worn surfaces was atout 0.35mm; the semimetallic friction material containing 15%-20%of Cu had better wear-resistance,and can form a even and continuous transfer film of copper; crack peeling was the importantmechanism of the counterpart.The experimental results also provided a scientific basis for the studyand application of semimnetallic friciton materials.