水/油润滑条件下PTFE复合材料的摩擦学性能

Tribological Properties of PTFE Composites under Water and Oil Lubrication Conditions

将碳纤维(CF)和锡青铜粉(Cu)分别添加到聚四氟乙烯(PTFE)中制备了两种PTFE复合材料,并将其与42CrMo钢环形成摩擦副,研究了两种PTFE复合材料在干摩擦、水润滑和油润滑条件下的摩擦学性能,并用扫描电子显微镜观察了两种复合材料的磨损表面形貌,分析了磨损机理。结果表明:在干摩擦和油润滑条件下,随着碳纤维含量的增加,CF/PTFE复合材料的摩擦因数增大,磨痕宽度减小;两种PTFE复合材料在干摩擦条件下的摩擦因数最大,油润滑条件下的摩擦因数最小;而且在油润滑条件下,两种PTFE复合材料的磨痕宽度最小;水润滑条件下的摩擦因数比干摩擦的的要小,但磨痕宽度比干摩擦时的要大;CF/PTFE复合材料的磨损机理主要为疲劳磨损,犁沟形貌不明显;Cu/PTFE复合材料的磨损机理主要为磨料磨损,犁沟形貌明显,伴有疲劳磨损。

Two kinds of polytetrafluoroethylene（PTFE）based composites were prepared by adding carbon fibers（CF）and bronze powders（Cu）respectively,and then they were matched with 42 CrMo steel rings to form friction pairs.The tribological properties of these two PTFE composites were studied under dry friction,water lubrication and oil lubrication conditions.The worn surface morphology of the composites was observed by SEM,and the wear mechanism was analyzed.The results show that under dry friction and oil lubrication conditions,the friction coefficient of CF/PTFE composites increased with the increase of carbon fiber content,while the scar width decreased.The friction coefficient of the two composites was maximum under dry friction condition and was minimum under oil lubrication condition.And under the oil lubrication condition,the scar width of the two PTFE composites was minimum.The friction coefficient under the water lubrication condition was smaller than that under dry friction condition,but the scar width was bigger.The wear mechanism of CF/PTFE composites was mainly fatigue wear,and the furrow morphology was not obvious.The wear mechanism of Cu/PTFE composites was mainly abrasive wear accompanied by fatigue wear,and the furrow morphology was obvious.