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The surface of ZrO2 nanoparticles was modified with silane coupling agent KH-560 by dispersing the nanoparticles in 20#machine oil.The tribological performance of the 20#machine oil with ZrO2 nanoparticles was evaluated by a four-ball tester and a thrust-ring machine.The loss of the thrust-ring weight was measured by an electronic balance with a precision of 0.0001 g.The worn surface was examined under a metallographic microscope with 400-times magnification.The results showed that the average friction coefficient decreased by 27.34%,and that the weight loss of the thrust-ring indicated no wear or negative wear,the wear loss after six loads tests being-0.0163 g.The anti-wear(AW)and reducing friction(RF)abilities of the oil with ZrO2 nanoparticles addition were considerably improved,maximizing at an additive concentration of 0.5wt%.
The surface of ZrO2 nanoparticles was modified with silane coupling agent KH-560 by dispersing the nanoparticles in 20 # machine oil. The tribological performance of the 20 # machine oil with ZrO2 nanoparticles was evaluated by a four-ball tester and a thrust-ring machine The loss of the thrust-ring weight was measured by an electronic balance with a precision of 0.0001 g. The worn surface was examined under a metallographic microscope with 400-times magnification. The results showed that the average friction coefficient decreased by 27.34% and that the weight loss of the thrust-ring indicates no wear or negative wear, the wear loss after six loads tests being-0.0163 g. the anti-wear (AW) and reducing friction (RF) abilities of the oil with ZrO2 nanoparticles addition were considerably better, at an additive concentration of 0.5% by weight.