Tribological Performance of Halogen-Free Ionic Liquids as Lubricants of Hard Coatings and Ceramics
Tribological Performance of Halogen-Free Ionic Liquids as Lubricants of Hard Coatings and Ceramics
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DOI：
10.1007/s11249-013-0159-1
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发表时间：
2013-08-01
影响因子：
3.2
通讯作者：
Sasaki, Shinya
中科院分区：
文献类型：
--
作者：
Kondo, Yuriko;Koyama, Takahiro;Sasaki, Shinya
离子液体具有低挥发性、高热稳定性和高氧化安定性等优点，有望成为新型高性能润滑剂。众所周知，含卤素离子液体对金属具有良好的润滑性。然而，由于卤化物的形成，离子液体的腐蚀性引起了人们的关注。无卤离子液体对金属的润滑性不如含卤离子液体，但不会引起明显的腐蚀效应。在本研究中，使用SRV摆动式滑动试验机评价了硬质涂层和陶瓷用无卤离子液体1-丁基-3-甲基咪唑三氰胺([BMIM][TCC])和1-乙基-3-甲基咪唑二氰胺([EMIM][DCN])的润滑性。离子液体对烧结陶瓷具有良好的润滑性。认为陶瓷的润滑性取决于表面与离子液体之间的化学作用。离子液体对不同的氮化物涂层表现出不同的润滑性能。[EMIM][DCN]比[BMIM][TCC]在CrN上具有更好的减磨效果，其摩擦系数也高于[BMIM][TCC]。含有[EMIM][DCN]的DLC涂层比含有[BMIM][TCC]的涂层具有更好的润滑性，尤其是无氢DLC和[EMIM][DCN]的组合表现出更好的润滑性。XPS分析表明，在[EMIM][DCN]润滑的无氢类金刚石滑动表面上存在两种含氮化合物。
Ionic liquids are expected to be used as new high-performance 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. However, there is a concern about the corrosiveness of ionic liquids caused by the formation of halides. The lubricity of halogen-free ionic liquids for metals is inferior to that of halogen-containing ionic liquids; however, they do not cause any remarkable corrosion effects. In this study, the lubricity of halogen-free ionic liquids-1-butyl-3-methylimidazolium tricyanomethanide ([BMIM] [TCC]) and 1-ethyl-3-methylimidazolium dicyanamide ([EMIM] [DCN])-for hard coatings and ceramics was evaluated using an SRV oscillating sliding tester. Ionic liquids exhibited excellent lubricity for sintered ceramics. It is supposed that the lubricity of ceramics depends on the chemical interaction between the surface and the ionic liquids. Ionic liquids exhibited different lubricating properties with each nitride coating. [EMIM] [DCN] exhibited a better wear reduction than [BMIM] [TCC] on CrN, and its friction coefficient was higher than that of [BMIM] [TCC]. DLC coatings with [EMIM] [DCN] exhibited better lubricity than with [BMIM] [TCC], and the combination of H-free DLC and [EMIM] [DCN] particularly showed excellent lubricity. XPS analysis showed that two kinds of nitrogen compounds were on the sliding surface of H-free DLC lubricated with [EMIM] [DCN].