【作者】 王洋； 胡铮； 张万昊； 张坤； 魏炳忱；

【Author】 Wang Yang;Hu Zheng;Zhang Wanhao;Zhang Kun;Wei Bingchen;Key Laboratory of Microgravity (National Microgravity Laboratory) Institute of Mechanics Chinese Academy of Sciences;School of Engineering Science University of Chinese Academy of Sciences;Science and Technology on Vehicle Transmission Laboratory China North Vehicle Research Institute;

【机构】 中国科学院力学研究所国家微重力实验室； 中国科学院大学工程科学学院； 中国北方车辆研究所车辆传动重点实验室；

【摘要】 本文对铜基粉末冶金刹车片进行热处理,首先利用销盘定速摩擦磨损试验机检验摩擦材料的短时摩擦学性能,同时通过SAE2台架试验研究实际工况下的长时接合摩擦性能。采用扫描电子显微镜(SEM)及维氏硬度实验分析了表面摩擦层热处理处理前后的微观结构和磨损形貌以及宏观硬度变化。结果表明,热处理试样摩擦区域表面相对光滑和平整,并未出现明显的犁沟状损伤;试样的宏观硬度增加,且硬度分布更均匀。动摩擦因数显著提高,且随时间的变化趋势更加平稳。这说明热处理对铜基摩擦层的短时摩擦性能以及实际工况下的长时摩擦性能有一定的改善。更多还原

【Abstract】 The effect of heat treatment on friction properties of Cu-based powder metallurgy brake pads was studied. Firstly, the short-term friction properties of friction layer are tested by pin-disc friction and wear test. Meanwhile, the long-term friction performance is investigated by SAE2 test. Scanning electron microscope(SEM) was used to characterize the microstructures and wear morphology of friction layer before and after heat treatment. The results show that the surface of the friction layer after treatment is more smooth and flat, without obvious furrow damage. Meanwhile, the macroscopic hardness of the friction layer after treatment increased obviously, and Weibull statistical analysis results also indicate that the friction layer is more homogeneous after treatment. Moreover, the dynamic friction coefficient of friction layer after treatment is significantly improved, and the change trend with time is more stable. The experimental results demonstrated that the short-term friction properties of Cu-based friction materials as well as the long-term friction performance of vehicle brake pads can be significantly improved by heat treatment.更多还原