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Tribological Performance of Halogen-Free Ionic Liquids as Lubricants of Hard Coatings and Ceramics

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An Erratum to this article was published on 04 July 2013

Abstract

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].

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Authors and Affiliations

  1. Tokyo University of Science, 6-3-1 Niijyuku, Katsushika-ku, Tokyo, 125-8585, Japan

    Yuriko Kondo, Takahiro Koyama, Ryo Tsuboi & Shinya Sasaki

  2. AIST, 1-2-1 Namiki, Tsukuba, Ibaraki, 305-8564, Japan

    Miki Nakano, Koji Miyake & Shinya Sasaki

Authors
  1. Yuriko Kondo
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  2. Takahiro Koyama
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  3. Ryo Tsuboi
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  4. Miki Nakano
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  5. Koji Miyake
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  6. Shinya Sasaki
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Correspondence to Shinya Sasaki.

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Kondo, Y., Koyama, T., Tsuboi, R. et al. Tribological Performance of Halogen-Free Ionic Liquids as Lubricants of Hard Coatings and Ceramics. Tribol Lett 51, 243–249 (2013). https://doi.org/10.1007/s11249-013-0159-1

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  • DOI: https://doi.org/10.1007/s11249-013-0159-1

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