【摘要】 在CA6140型车床配置的高速摩擦磨损试验装置上进行滑动摩擦磨损试验,研究了WC-10Co和WC-12Co硬质合金与7050-T7451铝合金摩擦副的摩擦磨损特性,采用扫描电子显微镜和X射线能量色散谱仪观察和分析硬质合金的磨损表面形貌及其元素的扩散现象.结果表明,随着法向载荷和转速的提高,2种硬质合金的摩擦系数均呈下降趋势.在相同条件下,WC-12Co比WC-10Co的摩擦系数稍高,而摩擦温度和磨损体积损失低于WC-10Co.超细晶粒硬质合金的主要磨损机制为Co粘结相塑性变形、WC晶粒脱落造成的磨粒磨损和粘结磨损并伴有少量的扩散磨损.更多还原

【Abstract】 Sliding friction and wear tests were carried out in a special tribometer assembled on CA6140 turning lathe to investigate the friction and wear properties of two different cemented carbides(WC-10Co and WC-12Co) against aluminum alloy 7050-T7451.The morphological analyses of the worn surface were made by scanning electron microscope and the diffusion behavior of elements was analyzed by X-ray energy spectrometer.The friction coefficients of two cemented carbides decreased with the increase of normal load and sliding speed.Under the same friction condition,the friction coefficient of WC-12Co was larger than that of WC-10Co,but the friction temperature and the wear volume loss of WC-12Co were lower than that of WC-10Co.The main wear mechanisms of ultra-fine grain cemented carbide were abrasive wear and adhesive wear caused by the plastic deformation of cobalt binder phase and by the removals of some tungsten carbide grains,accompanied with diffusive wear.更多还原