Research on Wear Behavior of NBR by 45 Steel in Crude Oil Medium
NBR is the essential material selected for the stator of progressing cavity pump which is used for oil extraction. The premature failure of NBR is the primary cause for shortening working life of the pump. Wear behavior of NBR and its mechanism by 45 steel were studied in crude oil medium using a MPV-600-type compute-controlled abrasive wear test machine. Through the friction test found at constant low load, and at constant temperature, the friction coefficient is along with the rotational speed increased first and then decreased and then increased; At constant low speed, and at constant temperature, friction coefficient decreases as the force increases; The friction coefficient increases with rising temperature first and then drops; The main wear mechanism of the rubber in crude oil is wet abrasive wear. The test results on the rational selection of working parameters to improve rubber metal friction pair of whole life have practical significance.