不同压力下聚四氟乙烯复合材料的磨损行为

STUDY ON WEAR BEHAVIOR OF PTFE COMPOSITES UNDER VARIOUS LOAD

对炭纤维等无机填料增强的聚四氟乙烯(PTFE)复合材料在低、中、高压下的摩擦磨损行为进行了研究。利用扫描电子显微镜分析了材料的磨损状况,利用差热扫描量热分析仪、X射线衍射仪对材料的热性能及结晶性能进行了分析,并与材料的摩擦、磨损性能相联系。研究结果表明,高压摩擦环境中,蠕变的发生是加速PTFE复合材料磨损、恶化材料性能的主要原因;高比表面填料的加入会提高复合材料的熔化热,有助于降低材料的磨损率;结晶度的提高对增强复合材料的耐蠕变性有明显的效果。

The tribological behavior of polytetrafluroethylene (PTFE) composites filled with carbon fibers(CF)etc fillers was studied under different load. Composite microstructures and modes failure were investiged by SEM. The fusion heat and the degree of crystallinity of the various composites were got by DSC and XRD, which were related to the tribological performance. These results indicate that the creep fracture is the main reason of early failure of PTFE composites under high load; and the addition of fillers with high specific surface area will cause an increase in the fusion heat of PTFE composites, then that makes the wear rate decrease; the crystallinity of PTFE matrix has distinctly effect on the resistance of creep distortion.