The Run-in Process for Stable Friction Fade-Out and Tribofilm Analyses by SEM and Nano-Indenter

It was shown in previous reports by authors that friction coefficients of the level of 0.0001 were achieved when ZrO2 (Y-PSZ: yttria partially stabilized zirconia) pins were slid against diamond-like carbon (DLC) films in H2-gas environment under heavy applied load of 63.7 N (friction fade-out, FFO)...

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Autores principales:	Masataka Nosaka, Yushi Morisaki, Tomoaki Fujiwara, Hideaki Tokai, Masahiro Kawaguchi, Takahisa Kato
Formato:	article
Lenguaje:	EN
Publicado:	Japanese Society of Tribologists 2017
Materias:	dlc run-in zirconia h2 gas environment catalytic reaction friction fade-out tribofilm contact stiffness 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/17e67232841c464aa78777fe07b9b2bc
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spelling	oai:doaj.org-article:17e67232841c464aa78777fe07b9b2bc2021-11-05T09:19:54ZThe Run-in Process for Stable Friction Fade-Out and Tribofilm Analyses by SEM and Nano-Indenter1881-219810.2474/trol.12.274https://doaj.org/article/17e67232841c464aa78777fe07b9b2bc2017-12-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/trol/12/5/12_274/_pdf/-char/enhttps://doaj.org/toc/1881-2198It was shown in previous reports by authors that friction coefficients of the level of 0.0001 were achieved when ZrO2 (Y-PSZ: yttria partially stabilized zirconia) pins were slid against diamond-like carbon (DLC) films in H2-gas environment under heavy applied load of 63.7 N (friction fade-out, FFO). It was also shown that FFO continued long when the main H2-gas flow was mixed with a small amount of aqueous-alcohol vapor. A tribofilm was formed at the contact area of ZrO2 surface, and it was considered that the aqueous-alcohol vapor made the tribofilm strong. In the present research, the run-in process for achieving more stable FFO is investigated by varying the run-in pattern consisting of load step-up and aqueous-alcohol vapor addition, and the stable FFO continuing several hours is realized reproducibly. Then, before and after the FFO onset, the contact area on ZrO2 surface is observed by SEM, and nano-indentation hardness of tribofilm is measured. It will be shown that a substance made of hydrocarbons with low melting temperature, low electrical conductivity and low nano-indentation hardness such as hydrocarbon polymers is formed on the tribofilm, suggesting the evolution of hydrocarbon gas at the sliding surface.Masataka NosakaYushi MorisakiTomoaki FujiwaraHideaki TokaiMasahiro KawaguchiTakahisa KatoJapanese Society of Tribologistsarticledlcrun-inzirconiah2 gas environmentcatalytic reactionfriction fade-outtribofilmcontact stiffnessPhysicsQC1-999Engineering (General). Civil engineering (General)TA1-2040Mechanical engineering and machineryTJ1-1570ChemistryQD1-999ENTribology Online, Vol 12, Iss 5, Pp 274-280 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	dlc run-in zirconia h2 gas environment catalytic reaction friction fade-out tribofilm contact stiffness Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
spellingShingle	dlc run-in zirconia h2 gas environment catalytic reaction friction fade-out tribofilm contact stiffness Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999 Masataka Nosaka Yushi Morisaki Tomoaki Fujiwara Hideaki Tokai Masahiro Kawaguchi Takahisa Kato The Run-in Process for Stable Friction Fade-Out and Tribofilm Analyses by SEM and Nano-Indenter
description	It was shown in previous reports by authors that friction coefficients of the level of 0.0001 were achieved when ZrO2 (Y-PSZ: yttria partially stabilized zirconia) pins were slid against diamond-like carbon (DLC) films in H2-gas environment under heavy applied load of 63.7 N (friction fade-out, FFO). It was also shown that FFO continued long when the main H2-gas flow was mixed with a small amount of aqueous-alcohol vapor. A tribofilm was formed at the contact area of ZrO2 surface, and it was considered that the aqueous-alcohol vapor made the tribofilm strong. In the present research, the run-in process for achieving more stable FFO is investigated by varying the run-in pattern consisting of load step-up and aqueous-alcohol vapor addition, and the stable FFO continuing several hours is realized reproducibly. Then, before and after the FFO onset, the contact area on ZrO2 surface is observed by SEM, and nano-indentation hardness of tribofilm is measured. It will be shown that a substance made of hydrocarbons with low melting temperature, low electrical conductivity and low nano-indentation hardness such as hydrocarbon polymers is formed on the tribofilm, suggesting the evolution of hydrocarbon gas at the sliding surface.
format	article
author	Masataka Nosaka Yushi Morisaki Tomoaki Fujiwara Hideaki Tokai Masahiro Kawaguchi Takahisa Kato
author_facet	Masataka Nosaka Yushi Morisaki Tomoaki Fujiwara Hideaki Tokai Masahiro Kawaguchi Takahisa Kato
author_sort	Masataka Nosaka
title	The Run-in Process for Stable Friction Fade-Out and Tribofilm Analyses by SEM and Nano-Indenter
title_short	The Run-in Process for Stable Friction Fade-Out and Tribofilm Analyses by SEM and Nano-Indenter
title_full	The Run-in Process for Stable Friction Fade-Out and Tribofilm Analyses by SEM and Nano-Indenter
title_fullStr	The Run-in Process for Stable Friction Fade-Out and Tribofilm Analyses by SEM and Nano-Indenter
title_full_unstemmed	The Run-in Process for Stable Friction Fade-Out and Tribofilm Analyses by SEM and Nano-Indenter
title_sort	run-in process for stable friction fade-out and tribofilm analyses by sem and nano-indenter
publisher	Japanese Society of Tribologists
publishDate	2017
url	https://doaj.org/article/17e67232841c464aa78777fe07b9b2bc
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The Run-in Process for Stable Friction Fade-Out and Tribofilm Analyses by SEM and Nano-Indenter

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