新規潤滑剤としてのイオン液体
スポンサーリンク
概要
- 論文の詳細を見る
Ionic liquids are expected to be used as advanced lubricants because of their low volatility, high thermal stability, and high oxidation stability. It is well known that halogen-containing ionic liquids exhibit excellent lubricity for metals. On the other hand, there is concern about the corrosiveness of ionic liquids caused by tribo-chemical reactions. Formation of the metal-fluoride boundary layer reduced friction; however, corrosion occurred on the worn surfaces after the sliding. In order to apply the ionic liquids as lubricants, it is necessary to prevent the corrosiveness. It is an effective method to control the sliding atmosphere such as in vacuum, because the hydrofluoric acid, which is produced by the reaction between metal fluoride and contaminating water from the atmosphere, causes the corrosion. The phosphorus element in the halogen-containing ionic liquids composed of a phosphate anion or phosphonium cation also inhibits the corrosion. The halogen-free ionic liquids do not cause any remarkable corrosion, though they show inferior lubricity compared with the halogen-containing ionic liquids. It is one of the important solutions to find the best combination of the halogen-free ionic liquid and the sliding material. The lubricity of ionic liquids shows domination in vacuum. Especially, the superior performance is possessed as a space lubricant compared with the conventional lubricants. The view in the future as the lubricant fluids is introduced with the basic tribological properties of the ionic liquids.
著者
-
佐々木 信也
Department of Mechanical Engineering, Tokyo University of Science
-
近藤 ゆりこ
Department of Mechanical Engineering, Tokyo University of Science
-
小山 貴大
Department of Mechanical Engineering, Tokyo University of Science