Abstract
Light-controlled friction and lubrication has a wide prospect in industry and life. The friction coefficient of water lubrication between silicon nitride and titanium dioxide was found to be significantly changed by ultraviolet treatment from superlubricity to near lubrication failure. Under fully flooded conditions, the relative difference in wettability between wear and non-wear zone determined film formation of water lubrication, and its change after ultraviolet treatment aroused the failure of lubrication. While for the starved water lubrication, ultraviolet treatment slowed down the tribo-chemical reaction rate to form smaller particles on wear area, which was more conducive to lubrication and even reduced to superlubricity. Such enormous changes of water lubrication in macroscale may throw a new light on light-controlled friction and lubrication.
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