Thermally sprayed coatings have been used in various fields of industry for enhancing\nsurface characteristics of materials and extending their service life. The contact\nsurface of some mechanical equipment such as the fine pulverization equipment\nwhich is used in the woody biomass production process is required to have wear resistance\nin the water environment. Thermally sprayed coatings would be a good candidate\nto improve surface wear resistance under water lubrication. The objective of\nthis study was to evaluate the tribological performance of thermally sprayed coatings\nunder water lubrication. Thermally sprayed coatings which were classified into WC,\nWB and Ni spraying of three categories were compared with water-lubricated sliding\ntest at a sliding velocity of 0.02 m/s and mean pressure of p0 = 10 MPa with a ringon-\ndisk apparatus. Thermally sprayed coatings showed comparatively high friction\ncoefficient and well wear resistance under water lubrication. WC contained coatings\nshowed better wear resistance than WB and Ni coatings. Thermally sprayed coatings\nshowed obviously different mechanical properties and tribological behaviors, and the\neffect of wettability and hardness on tribological characteristics was discussed under\nwater lubrication. Friction coefficient increased as the surface contact angle of thermally\nsprayed coatings increased. The wear rate decreased as the surface hardness of\nthermally sprayed coatings increased. Wear resistance of thermally sprayed coatings\nwas excellent under water lubrication. WC contained coatings showed lower wear\nrate than WB and Ni coatings. WC-14CoCr coating showed the lowest wear rate.
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