Friction Laws Determination of Random-Textured Surface of Microcrystalline Diamond Coatings, Using the Oscillating Tribometer Technique

Achieving low-friction and robust tribosystems is an open and challenging question to tribologists. In this study, we are considering the diamond films as candidates. Quantification of friction is obtained here using an original technique, so called the oscillating relaxation tribometry. It is based...

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Autores principales:	Michel Belin, Hiroyuki Miki, Toshiyuki Takagi
Formato:	article
Lenguaje:	EN
Publicado:	Japanese Society of Tribologists 2019
Materias:	friction damping relaxation tribometer transient oscillations diamond films textured surfaces 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/938c2f3e29fb477c90028717db7132cc
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spelling	oai:doaj.org-article:938c2f3e29fb477c90028717db7132cc2021-11-05T09:17:49ZFriction Laws Determination of Random-Textured Surface of Microcrystalline Diamond Coatings, Using the Oscillating Tribometer Technique1881-219810.2474/trol.14.109https://doaj.org/article/938c2f3e29fb477c90028717db7132cc2019-07-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/trol/14/3/14_109/_pdf/-char/enhttps://doaj.org/toc/1881-2198Achieving low-friction and robust tribosystems is an open and challenging question to tribologists. In this study, we are considering the diamond films as candidates. Quantification of friction is obtained here using an original technique, so called the oscillating relaxation tribometry. It is based on the study of the oscillating motion of a free-damped 1-DOF mechanical oscillator, the sliding contact acting as a main source of mechanical dissipation (“relaxation”). Therefore, it is possible to determine friction value and its sliding speed dependency, i.e. a kind of “Stribeck curve“ under non-stationary conditions. The interest of such “relaxation tribometer“ is to characterize low friction with an unequalled sensitivity, and to directly obtain the “friction law“ thanks to a robust and rapid experimental test. Polycrystalline diamond films are deposited by the Hot Filament CVD method on SiC substrate, which were partly polished and finished to gradient surface roughness with random-textured asperities. Stainless steel balls of 6.0 mm diameter are used as the rubbing counterface. The normal force is varied between 50 and 300 mN, leading respectively to a maximum Hertzian contact pressure of 0.30 and 0.71 GPa, respectively. Taking into account the experimental setup, the sliding speed is decaying as a damped pseudo-sine motion, the maximum sliding value being set to 0.16 m/s, progressively decaying to 0 when mechanical equilibrium is reached, within a typical duration of 5 s. First results are reported here, using this innovative friction characterization technique. The different contributions to friction of the surface roughness are analyzed and discussed. These results show the major interest of the use of this method to characterize the low-friction behavior of textured diamond films. These results are discussed and the high potential of such textured films in actual tribosystems is presented here.Michel BelinHiroyuki MikiToshiyuki TakagiJapanese Society of Tribologistsarticlefrictiondampingrelaxation tribometertransient oscillationsdiamond filmstextured surfacesPhysicsQC1-999Engineering (General). Civil engineering (General)TA1-2040Mechanical engineering and machineryTJ1-1570ChemistryQD1-999ENTribology Online, Vol 14, Iss 3, Pp 109-114 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	friction damping relaxation tribometer transient oscillations diamond films textured surfaces Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
spellingShingle	friction damping relaxation tribometer transient oscillations diamond films textured surfaces Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999 Michel Belin Hiroyuki Miki Toshiyuki Takagi Friction Laws Determination of Random-Textured Surface of Microcrystalline Diamond Coatings, Using the Oscillating Tribometer Technique
description	Achieving low-friction and robust tribosystems is an open and challenging question to tribologists. In this study, we are considering the diamond films as candidates. Quantification of friction is obtained here using an original technique, so called the oscillating relaxation tribometry. It is based on the study of the oscillating motion of a free-damped 1-DOF mechanical oscillator, the sliding contact acting as a main source of mechanical dissipation (“relaxation”). Therefore, it is possible to determine friction value and its sliding speed dependency, i.e. a kind of “Stribeck curve“ under non-stationary conditions. The interest of such “relaxation tribometer“ is to characterize low friction with an unequalled sensitivity, and to directly obtain the “friction law“ thanks to a robust and rapid experimental test. Polycrystalline diamond films are deposited by the Hot Filament CVD method on SiC substrate, which were partly polished and finished to gradient surface roughness with random-textured asperities. Stainless steel balls of 6.0 mm diameter are used as the rubbing counterface. The normal force is varied between 50 and 300 mN, leading respectively to a maximum Hertzian contact pressure of 0.30 and 0.71 GPa, respectively. Taking into account the experimental setup, the sliding speed is decaying as a damped pseudo-sine motion, the maximum sliding value being set to 0.16 m/s, progressively decaying to 0 when mechanical equilibrium is reached, within a typical duration of 5 s. First results are reported here, using this innovative friction characterization technique. The different contributions to friction of the surface roughness are analyzed and discussed. These results show the major interest of the use of this method to characterize the low-friction behavior of textured diamond films. These results are discussed and the high potential of such textured films in actual tribosystems is presented here.
format	article
author	Michel Belin Hiroyuki Miki Toshiyuki Takagi
author_facet	Michel Belin Hiroyuki Miki Toshiyuki Takagi
author_sort	Michel Belin
title	Friction Laws Determination of Random-Textured Surface of Microcrystalline Diamond Coatings, Using the Oscillating Tribometer Technique
title_short	Friction Laws Determination of Random-Textured Surface of Microcrystalline Diamond Coatings, Using the Oscillating Tribometer Technique
title_full	Friction Laws Determination of Random-Textured Surface of Microcrystalline Diamond Coatings, Using the Oscillating Tribometer Technique
title_fullStr	Friction Laws Determination of Random-Textured Surface of Microcrystalline Diamond Coatings, Using the Oscillating Tribometer Technique
title_full_unstemmed	Friction Laws Determination of Random-Textured Surface of Microcrystalline Diamond Coatings, Using the Oscillating Tribometer Technique
title_sort	friction laws determination of random-textured surface of microcrystalline diamond coatings, using the oscillating tribometer technique
publisher	Japanese Society of Tribologists
publishDate	2019
url	https://doaj.org/article/938c2f3e29fb477c90028717db7132cc
work_keys_str_mv	AT michelbelin frictionlawsdeterminationofrandomtexturedsurfaceofmicrocrystallinediamondcoatingsusingtheoscillatingtribometertechnique AT hiroyukimiki frictionlawsdeterminationofrandomtexturedsurfaceofmicrocrystallinediamondcoatingsusingtheoscillatingtribometertechnique AT toshiyukitakagi frictionlawsdeterminationofrandomtexturedsurfaceofmicrocrystallinediamondcoatingsusingtheoscillatingtribometertechnique
_version_	1718444424475705344

Friction Laws Determination of Random-Textured Surface of Microcrystalline Diamond Coatings, Using the Oscillating Tribometer Technique

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