The adsorption behavior and lubrication behavior of oleic acid on Si3N4 in ethanol and in hydrocarbons were investigated. The adsorption behavior was evaluated by contact angle measurement and by thin layer chromatography. The results suggested that oleic acid was adsorbed by Si3N4 both in ethanol solution of oleic acid and in n-undecane solution of oleic acid. The results also suggested that the adsorbed oleic acid was eluted from the oxidized surface of Si3N4 more easily with ethanol than with n-hexane. The lubrication behavior was examined by using a pin-on-disk machine. Si3N4 disk was slid against Si3N4 pin in ethanol, in n-undecane, in ethanol solution of oleic acid and in n-undecane solution of oleic acid. The addition of oleic acid resulted in decrease in friction and wear of Si3N4 both in ethanol and in n-undecane. In ethanol solution of oleic acid, ethoxysilane gel, which was tribochemical reaction product, and adsorbed oleic acid seemed to act as boundary lubrication film. In n-undecane solution of oleic acid, adsorbed oleic acid and friction polymer seemed to act as boundary lubrication film.
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