The wear characteristics of impregnated graphite under different paired pairs
The friction and wear properties of impregnated graphite were explored by TRB3 friction testing machine,and the GCr15 steel ball,Si3N4,and Al2O3 ceramic ball were used as friction pairs in the form of ball/plane contact.The friction coefficient,wear volume,wear mark contour,and surface morphology of the grinding mark were characterized and analyzed by scanning electron microscope and laser confocal mi-croscope.The friction scratches and wear characteristics of impregnated graphite under different normal loads were explored aiming to establish an energy wear model to explore the changing mechanism of con-tact state during wear and predict the wear process.The results showed that with the gradual increase of hardness of the upper specimen,the friction coefficient gradually increases under low loads and decreases under high loads.Under different friction pair effects,the surface of graphite presents separately shallow surface wear marks similar to"U"-shaped,"V"-shaped,and"W"-shaped contours,respectively.The main wear mechanisms between graphite and GCr15,Si3N4 and Al2O3 pairing pairs are adhesive wear,ab-rasive wear,and slight oxidation wear.Material transfer,peeling,and furrow phenomena are evident be-tween the surfaces of the friction pair.
万方数据
维普
