Effect of Particle Sizes on Wear and Vibration Properties of Polyurethane Composites Under Sand Water Lubrication Environments

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The tribological and vibration properties of polyurethane-carnauba wax composites (PUCW10) against copper disks in water-lubricated environments containing sand particles with three different sizes were studied. The results show that the severe abrasive wear of sand particles leads to the highest average friction coefficient (0.431) and wear loss (0.036 g) of PUCW10 against the copper disk in water-lubricated environment with 300 mesh sand particles, which are 71.03% and 227.3% higher than those in pure water environment, respectively. The embedding of particles also leads to the serious vibration of grinding system, but the vibration intensity will be weakened with the decrease of rigid asperity at the interface. The change of interface state caused by the easy embedding of small size particles on the surface of PUCW10 is the main reason for the difference of tribological properties under different particle size environments.