原油介质中FKM/NBR混炼胶磨损行为研究

Research on Wear Behavior of FKM / NBR Blends under Crude Oil Lubrication

在MPV-600型磨粒磨损试验机上研究相同硬度的氟橡胶和丁腈橡胶及其配比为5∶5和2∶8的混炼胶试样在原油介质润滑条件下的磨损行为,分析在不同载荷、转速下混炼橡胶与金属摩擦副的动态摩擦磨损特性,以期得到性能优异的FKM/NBR混炼胶用于螺杆泵定子。利用体式显微镜观察橡胶试样的磨损形貌,初步分析其磨损机制。结果表明:在原油润滑条件下配比为2∶8的混炼胶具有较低的磨损量和较小的稳态摩擦因数,其磨损量略高于氟橡胶;在原油润滑条件下丁腈橡胶的磨损机制是以磨粒磨损为主,而混炼胶和氟橡胶则以疲劳磨损为主。

The wear behaviors of FKM and NBR and their blends （5：5 and 2：8 ） with the same hardness were investi- gated in the MPV-600 type abrasive wear tester under base oil lubrication conditions. By changing the load and speed, com- parative analysis was performed for dynamic friction and wear characteristics of the rubber and metal in order to obtain the FKM/NBR blends used as the stator rubber of progressing cavity pump. Wear morphology of the rubber was observed using the stereo microscope in order to analyze the wear mechanism. Experimental results show that the blend rubber with the ra- tio of 2：8 of FKM and NBR has lower wear loss and smaller frictional coefficient, its wear is slightly higher than that of FKM under oil lubrication conditions. The wear mechanism of NBR belongs to abrasive wear, and the wear mechanism of FKM and blend rubbers are the fatigue wear under oil lubrication conditions.