エタノール中およびn-ウンデカン中の窒化ケイ素の摩擦摩耗特性に対するオレイン酸の効果

抄録

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.