Lubrication Mechanism of Halogen-Free Ionic Liquids

Ionic liquids have potential for use as novel high-performance lubricants because of their attractive characteristics such as low volatility, high-thermal stability, and oxidation stability. It is known that ionic liquids exhibit excellent lubricity for metals because of halogen constituents in thei...

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Autores principales:	Shouhei Kawada, Seiya Watanabe, Ryo Tsuboi, Shinya Sasaki, Braham Prakash
Formato:	article
Lenguaje:	EN
Publicado:	Japanese Society of Tribologists 2017
Materias:	ionic liquid hydrogenated free diamond-like carbon tof-sims halogen-free afm Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/38dca57396294ee8ad83fee4758c5716
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spelling	oai:doaj.org-article:38dca57396294ee8ad83fee4758c57162021-11-05T09:20:03ZLubrication Mechanism of Halogen-Free Ionic Liquids1881-219810.2474/trol.12.155https://doaj.org/article/38dca57396294ee8ad83fee4758c57162017-08-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/trol/12/4/12_155/_pdf/-char/enhttps://doaj.org/toc/1881-2198Ionic liquids have potential for use as novel high-performance lubricants because of their attractive characteristics such as low volatility, high-thermal stability, and oxidation stability. It is known that ionic liquids exhibit excellent lubricity for metals because of halogen constituents in their molecular structure. However, occurrence of corrosive damage on the contacting surfaces lubricated with the ionic liquids has also been reported. To prevent damage due to corrosion, it is necessary to use halogen-free ionic liquids whose lubricity may be inferior compared with that of halogen-containing ionic liquids. In this study, the lubricity of halogen-free ionic liquids 1-butyl-3-methylimidazolium dicyanamide ([BMIM][DCN]) and 1-butyl-3-methylimidazolium tricyanomethane ([BMIM][TCC]) was evaluated by using a reciprocating sliding friction and wear tester (SRV Optimol)) using an oscillating steel cylinder on H-free DLC disk test configuration under boundary lubrication conditions. The SRV test results showed that H-free DLC with [BMIM][TCC] at 50N exhibited superior lubricity than that with [BMIM][DCN] at the same load. In order to understand the observed, the worn surfaces of test specimens were analyzed by using Raman spectroscopy, the friction coefficient of the film by atomic force microscopy (AFM), and the chemical composition by time of flight secondary ion mass spectrometry (TOF-SIMS). From Raman spectroscopic analysis results, graphitization of the transfer films of both [BMIM][DCN] and [BMIM][TCC] did not occur. From AFM results, the topography of [BMIM][TCC] was smooth as compared with that of [BMIM][DCN]. Thus, it was considered that the surface roughness affected the lubricity. In addition, the tribofilm derived from [BMIM][TCC] also affected the lubricity because it showed low friction coefficient on the flat position. From ToF-SIMS results, it was considered that [BMIM][DCN] itself adsorbed on H-free DLC surface. On the other hand, [BMIM][TCC] is thermally decomposed by friction and generated isolated CN and covering the H-free DLC surface. The tribofilm formed by [BMIM][TCC] exhibited lower friction coefficient than that by [BMIM][DCN].Shouhei KawadaSeiya WatanabeRyo TsuboiShinya SasakiBraham PrakashJapanese Society of Tribologistsarticleionic liquidhydrogenated free diamond-like carbontof-simshalogen-freeafmPhysicsQC1-999Engineering (General). Civil engineering (General)TA1-2040Mechanical engineering and machineryTJ1-1570ChemistryQD1-999ENTribology Online, Vol 12, Iss 4, Pp 155-161 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	ionic liquid hydrogenated free diamond-like carbon tof-sims halogen-free afm Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
spellingShingle	ionic liquid hydrogenated free diamond-like carbon tof-sims halogen-free afm Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999 Shouhei Kawada Seiya Watanabe Ryo Tsuboi Shinya Sasaki Braham Prakash Lubrication Mechanism of Halogen-Free Ionic Liquids
description	Ionic liquids have potential for use as novel high-performance lubricants because of their attractive characteristics such as low volatility, high-thermal stability, and oxidation stability. It is known that ionic liquids exhibit excellent lubricity for metals because of halogen constituents in their molecular structure. However, occurrence of corrosive damage on the contacting surfaces lubricated with the ionic liquids has also been reported. To prevent damage due to corrosion, it is necessary to use halogen-free ionic liquids whose lubricity may be inferior compared with that of halogen-containing ionic liquids. In this study, the lubricity of halogen-free ionic liquids 1-butyl-3-methylimidazolium dicyanamide ([BMIM][DCN]) and 1-butyl-3-methylimidazolium tricyanomethane ([BMIM][TCC]) was evaluated by using a reciprocating sliding friction and wear tester (SRV Optimol)) using an oscillating steel cylinder on H-free DLC disk test configuration under boundary lubrication conditions. The SRV test results showed that H-free DLC with [BMIM][TCC] at 50N exhibited superior lubricity than that with [BMIM][DCN] at the same load. In order to understand the observed, the worn surfaces of test specimens were analyzed by using Raman spectroscopy, the friction coefficient of the film by atomic force microscopy (AFM), and the chemical composition by time of flight secondary ion mass spectrometry (TOF-SIMS). From Raman spectroscopic analysis results, graphitization of the transfer films of both [BMIM][DCN] and [BMIM][TCC] did not occur. From AFM results, the topography of [BMIM][TCC] was smooth as compared with that of [BMIM][DCN]. Thus, it was considered that the surface roughness affected the lubricity. In addition, the tribofilm derived from [BMIM][TCC] also affected the lubricity because it showed low friction coefficient on the flat position. From ToF-SIMS results, it was considered that [BMIM][DCN] itself adsorbed on H-free DLC surface. On the other hand, [BMIM][TCC] is thermally decomposed by friction and generated isolated CN and covering the H-free DLC surface. The tribofilm formed by [BMIM][TCC] exhibited lower friction coefficient than that by [BMIM][DCN].
format	article
author	Shouhei Kawada Seiya Watanabe Ryo Tsuboi Shinya Sasaki Braham Prakash
author_facet	Shouhei Kawada Seiya Watanabe Ryo Tsuboi Shinya Sasaki Braham Prakash
author_sort	Shouhei Kawada
title	Lubrication Mechanism of Halogen-Free Ionic Liquids
title_short	Lubrication Mechanism of Halogen-Free Ionic Liquids
title_full	Lubrication Mechanism of Halogen-Free Ionic Liquids
title_fullStr	Lubrication Mechanism of Halogen-Free Ionic Liquids
title_full_unstemmed	Lubrication Mechanism of Halogen-Free Ionic Liquids
title_sort	lubrication mechanism of halogen-free ionic liquids
publisher	Japanese Society of Tribologists
publishDate	2017
url	https://doaj.org/article/38dca57396294ee8ad83fee4758c5716
work_keys_str_mv	AT shouheikawada lubricationmechanismofhalogenfreeionicliquids AT seiyawatanabe lubricationmechanismofhalogenfreeionicliquids AT ryotsuboi lubricationmechanismofhalogenfreeionicliquids AT shinyasasaki lubricationmechanismofhalogenfreeionicliquids AT brahamprakash lubricationmechanismofhalogenfreeionicliquids
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Lubrication Mechanism of Halogen-Free Ionic Liquids

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