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The surface of ZrO 2 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 ZrO 2 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...
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