Effect of abrasive grain size on surface particle deposition behaviour of PTFE/bronze composites during abrasive wear

In this study, we explored the effects of abrasive grain size, applied load and sliding speed on the particle distribution density of polytetrafluoroethylene/bronze composite at the worn surface. Wear tests were performed against different sandpapers under varied loads and speeds. Results show that the surface density can be divided into three types, namely, lesser than, close to and more than the original volume fraction value of particle (15%), as the grain size decreases. This finding can be explained by the change in wear mechanisms. Micro-ploughing is the main mechanism of all the abrasive wears. When the grain size is large, the peeling-off of bronze particles occurs. On the contrary, when the grain size is small, the ‘rolling-effect’ of debris happens.