Analysis of Wear Track on DLC Coatings after Sliding with MoDTC-Containing Lubricants

Wear of DLC coating has been great concern in DLC/Steel sliding surface lubricated by molybdenum dithiocarbamate (MoDTC) containing lubricants. However, in order to design lubrication system with DLC and MoDTC, the mechanism of this issue is needed to be clarified. In this study, the roller-on-disc...

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Autores principales:	Kenji Ohara, Kiyoshi Hanyuda, Yasushi Kawamura, Kentaro Omura, Imari Kameda, Noritsugu Umehara, Hiroyuki Kousaka
Formato:	article
Lenguaje:	EN
Publicado:	Japanese Society of Tribologists 2017
Materias:	dlc wear lubrication xps 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/0a86aaf7bc0c482bb05dca01c4e5e461
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spelling	oai:doaj.org-article:0a86aaf7bc0c482bb05dca01c4e5e4612021-11-05T09:20:26ZAnalysis of Wear Track on DLC Coatings after Sliding with MoDTC-Containing Lubricants1881-219810.2474/trol.12.110https://doaj.org/article/0a86aaf7bc0c482bb05dca01c4e5e4612017-07-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/trol/12/3/12_110/_pdf/-char/enhttps://doaj.org/toc/1881-2198Wear of DLC coating has been great concern in DLC/Steel sliding surface lubricated by molybdenum dithiocarbamate (MoDTC) containing lubricants. However, in order to design lubrication system with DLC and MoDTC, the mechanism of this issue is needed to be clarified. In this study, the roller-on-disc oscillation friction test by SRV friction tester was conducted to provide the hypothesis about the mechanism of wear of DLC with MoDTC. In friction test, DLC coatings (a-C:H and ta-C) were coated on discs. Counterpart was the SUJ2 bearing steel roller. It was found that MoDTC in lubricants accelerated the wear of the both two DLC coatings and it was dramatic especially for a-C:H coating. In order to clarify the enhancement mechanism of MoDTC for wear of DLC coatings, the surface analysis on DLC coatings and steel roller was conducted with XPS (X-ray Photoelectron Spectroscopy) and surface profile meter. As a result, sp2 ratio increased layer was observed on the a-C:H coating with XPS and the surface roughness of wear track was larger than out of wear track after sliding with MoDTC containing lubricant. On the other hand, ta-C did not show the increasing of sp2 ratio and the surface roughness of wear track decreased after sliding with and without MoDTC containing lubricant. For both DLC coatings, tribofilm generated from MoDTC was also observed on the counter SUJ2 roller surface with XPS. Depth profile of chemical elements of the tribofilm on the steel roller with XPS contributed to clarify the distribution of Molybdenum compound as MoO3 and Mo2C. Top surface was MoO3 and the interface between the SUJ2 roller and tribfilm was Mo2C. The authors provide the hypothetical model about a tribo-chemical reaction between both DLC coatings as ta-C or a-C:H and tribofilm from MoDTC.Kenji OharaKiyoshi HanyudaYasushi KawamuraKentaro OmuraImari KamedaNoritsugu UmeharaHiroyuki KousakaJapanese Society of TribologistsarticledlcwearlubricationxpsPhysicsQC1-999Engineering (General). Civil engineering (General)TA1-2040Mechanical engineering and machineryTJ1-1570ChemistryQD1-999ENTribology Online, Vol 12, Iss 3, Pp 110-116 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	dlc wear lubrication xps Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
spellingShingle	dlc wear lubrication xps Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999 Kenji Ohara Kiyoshi Hanyuda Yasushi Kawamura Kentaro Omura Imari Kameda Noritsugu Umehara Hiroyuki Kousaka Analysis of Wear Track on DLC Coatings after Sliding with MoDTC-Containing Lubricants
description	Wear of DLC coating has been great concern in DLC/Steel sliding surface lubricated by molybdenum dithiocarbamate (MoDTC) containing lubricants. However, in order to design lubrication system with DLC and MoDTC, the mechanism of this issue is needed to be clarified. In this study, the roller-on-disc oscillation friction test by SRV friction tester was conducted to provide the hypothesis about the mechanism of wear of DLC with MoDTC. In friction test, DLC coatings (a-C:H and ta-C) were coated on discs. Counterpart was the SUJ2 bearing steel roller. It was found that MoDTC in lubricants accelerated the wear of the both two DLC coatings and it was dramatic especially for a-C:H coating. In order to clarify the enhancement mechanism of MoDTC for wear of DLC coatings, the surface analysis on DLC coatings and steel roller was conducted with XPS (X-ray Photoelectron Spectroscopy) and surface profile meter. As a result, sp2 ratio increased layer was observed on the a-C:H coating with XPS and the surface roughness of wear track was larger than out of wear track after sliding with MoDTC containing lubricant. On the other hand, ta-C did not show the increasing of sp2 ratio and the surface roughness of wear track decreased after sliding with and without MoDTC containing lubricant. For both DLC coatings, tribofilm generated from MoDTC was also observed on the counter SUJ2 roller surface with XPS. Depth profile of chemical elements of the tribofilm on the steel roller with XPS contributed to clarify the distribution of Molybdenum compound as MoO3 and Mo2C. Top surface was MoO3 and the interface between the SUJ2 roller and tribfilm was Mo2C. The authors provide the hypothetical model about a tribo-chemical reaction between both DLC coatings as ta-C or a-C:H and tribofilm from MoDTC.
format	article
author	Kenji Ohara Kiyoshi Hanyuda Yasushi Kawamura Kentaro Omura Imari Kameda Noritsugu Umehara Hiroyuki Kousaka
author_facet	Kenji Ohara Kiyoshi Hanyuda Yasushi Kawamura Kentaro Omura Imari Kameda Noritsugu Umehara Hiroyuki Kousaka
author_sort	Kenji Ohara
title	Analysis of Wear Track on DLC Coatings after Sliding with MoDTC-Containing Lubricants
title_short	Analysis of Wear Track on DLC Coatings after Sliding with MoDTC-Containing Lubricants
title_full	Analysis of Wear Track on DLC Coatings after Sliding with MoDTC-Containing Lubricants
title_fullStr	Analysis of Wear Track on DLC Coatings after Sliding with MoDTC-Containing Lubricants
title_full_unstemmed	Analysis of Wear Track on DLC Coatings after Sliding with MoDTC-Containing Lubricants
title_sort	analysis of wear track on dlc coatings after sliding with modtc-containing lubricants
publisher	Japanese Society of Tribologists
publishDate	2017
url	https://doaj.org/article/0a86aaf7bc0c482bb05dca01c4e5e461
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Analysis of Wear Track on DLC Coatings after Sliding with MoDTC-Containing Lubricants

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