Evaluation of Tribological Properties of PTFE-Composite Material and its Application to Maintenance-Free Bearing

基于PTFE的复合材料的摩擦和穿戴行为在各种实验条件下进行了评估。所获得的结果如以下所示：1.在10米/秒以上的滑动速度上，摩擦系数恒定在0.3。wear rate of the composite was of the order of 10 -6 D1（mm D13 D1/Nm）。因此，该复合物并没有将其转化为灾难性的服装，因为它在严重的滑动条件下。在小说之后，复合物的矩阵被大量的精细和棕色氧化物颗粒覆盖。玻璃纤维被抛光，变成扁平的。我建议这些嵌入的氧化物颗粒和玻璃纤维填充物加强了复合表面。基于PTFE的复合材料的摩擦和穿戴并不强烈依赖于匹配表面粗糙度。即使是表面粗糙度也会比石油薄膜厚度大，混合润滑也会持久。进一步的，混合润滑剂在100-150℃的高温下保持，并在0.02-0.04中有效地保持。因此，基于PTFE的组合具有高容量来维护混合润滑剂。由于在磨损测试中产生的磨损碎片的数量太小，而磨损碎片没有被激光差异粒度分析仪检测到清楚。检测到的磨损碎片体积小，0.4微米。因此，它是由基于PTFE的复合材料组成的，其润滑穿着非常小，而基于PTFE的复合材料具有很高的潜力，作为维护自由滑动轴承的实际用途。

Friction and wear behavior of PTFE-based composite was evaluated under various experimental conditions. The obtained results were as follows :1. At the sliding velocity above 10m/s, friction coefficient was constant at 〜0.3. The wear rate of the composite was of the order of 10ィイD1-6ィエD1(mmィイD13ィエD1/Nm). Thus the composite did not transit to a catastrophic wear such as seizure under the severe sliding condition. After friction, matrix of the composite was covered with much fine and brown oxide particles. Glass fibers were polished and became flat. It is suggested that these embedded oxide particles and glass fiber fillers strengthened the composite surface.2. Friction and wear of PTFE-based composite was not strongly dependent on the mating surface roughness. Even if the surface roughness became larger than the oil film thickness, mixed lubrication persisted. Further, mixed lubrication was maintained at high temperature of 100-150℃ and friction coefficient was 0.02-0.04. Thus PTFE-based composite had a high capacity for maintaining mixed lubrication.3. As the amount of wear debris generated in the wear test was too small, wear debris was not detected clearly by laser diffraction particle size analyzer. Size of detected wear debris was small and 0.4μm. Thus it was concluded that lubricated wear of PTFE-based composite was very small.From above results, it was concluded that the PTFE-based composite had a high potential for the practical use as the maintenance-free sliding bearing.