Numerical Analysis of Surface Force of Diamond-Like Carbon Surface Coated with Monolayer Lubricant Film

Diamond-like carbon (DLC) is widely used as a hard, protective layer with a relatively low surface energy. In the head‒disk interface in magnetic disk drives, however, the DLC layer is coated with a monolayer perfluoropolyether lubricant with a high bond ratio to avoid DLC‒DLC contact and to secure...

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Autor principal:	Kyosuke Ono
Formato:	article
Lenguaje:	EN
Publicado:	Japanese Society of Tribologists 2018
Materias:	surface force analysis rough surface adhesive contact asperity meniscus pressure van der waals pressure head-disk interface diamond-like carbon molecularly thin lubricant film bond ratio surface-modification coating 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/9c3411efcb1040dba9a24a95d3da21ff
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spelling	oai:doaj.org-article:9c3411efcb1040dba9a24a95d3da21ff2021-11-05T09:18:50ZNumerical Analysis of Surface Force of Diamond-Like Carbon Surface Coated with Monolayer Lubricant Film1881-219810.2474/trol.13.301https://doaj.org/article/9c3411efcb1040dba9a24a95d3da21ff2018-12-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/trol/13/6/13_301/_pdf/-char/enhttps://doaj.org/toc/1881-2198Diamond-like carbon (DLC) is widely used as a hard, protective layer with a relatively low surface energy. In the head‒disk interface in magnetic disk drives, however, the DLC layer is coated with a monolayer perfluoropolyether lubricant with a high bond ratio to avoid DLC‒DLC contact and to secure head/disk wear reliability. In this study, we theoretically analyzed the effect of lubricant thickness and bond ratio on the adhesion force between the head‒disk interface (HDI) in a mono/submono-layer thickness regime. It was found that the adhesion force had the lowest sensitivity to lubricant thickness variations at a 0.85 bond ratio. In addition, the maximum adhesion force was minimized when the lubricant thickness was ~0.6 nm for the measured parameter values of the HDI. This suggests that the current lubricant thickness of 1.0–1.2 nm can be reduced to 0.6 nm, accompanied by a slight decrease in the adhesion force and a slight increase in the resistance against any variation in its thickness. This tribo-surface-modification concept can be applied to surface-modification coatings in other fields such as micro/nano-electromechanical systems. The compatibility of the theoretical surface energy function with experimental data indicates the validity and consistency of this theory.Kyosuke OnoJapanese Society of Tribologistsarticlesurface force analysisrough surface adhesive contactasperity meniscus pressurevan der waals pressurehead-disk interfacediamond-like carbonmolecularly thin lubricant filmbond ratiosurface-modification coatingPhysicsQC1-999Engineering (General). Civil engineering (General)TA1-2040Mechanical engineering and machineryTJ1-1570ChemistryQD1-999ENTribology Online, Vol 13, Iss 6, Pp 301-310 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	surface force analysis rough surface adhesive contact asperity meniscus pressure van der waals pressure head-disk interface diamond-like carbon molecularly thin lubricant film bond ratio surface-modification coating Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
spellingShingle	surface force analysis rough surface adhesive contact asperity meniscus pressure van der waals pressure head-disk interface diamond-like carbon molecularly thin lubricant film bond ratio surface-modification coating Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999 Kyosuke Ono Numerical Analysis of Surface Force of Diamond-Like Carbon Surface Coated with Monolayer Lubricant Film
description	Diamond-like carbon (DLC) is widely used as a hard, protective layer with a relatively low surface energy. In the head‒disk interface in magnetic disk drives, however, the DLC layer is coated with a monolayer perfluoropolyether lubricant with a high bond ratio to avoid DLC‒DLC contact and to secure head/disk wear reliability. In this study, we theoretically analyzed the effect of lubricant thickness and bond ratio on the adhesion force between the head‒disk interface (HDI) in a mono/submono-layer thickness regime. It was found that the adhesion force had the lowest sensitivity to lubricant thickness variations at a 0.85 bond ratio. In addition, the maximum adhesion force was minimized when the lubricant thickness was ~0.6 nm for the measured parameter values of the HDI. This suggests that the current lubricant thickness of 1.0–1.2 nm can be reduced to 0.6 nm, accompanied by a slight decrease in the adhesion force and a slight increase in the resistance against any variation in its thickness. This tribo-surface-modification concept can be applied to surface-modification coatings in other fields such as micro/nano-electromechanical systems. The compatibility of the theoretical surface energy function with experimental data indicates the validity and consistency of this theory.
format	article
author	Kyosuke Ono
author_facet	Kyosuke Ono
author_sort	Kyosuke Ono
title	Numerical Analysis of Surface Force of Diamond-Like Carbon Surface Coated with Monolayer Lubricant Film
title_short	Numerical Analysis of Surface Force of Diamond-Like Carbon Surface Coated with Monolayer Lubricant Film
title_full	Numerical Analysis of Surface Force of Diamond-Like Carbon Surface Coated with Monolayer Lubricant Film
title_fullStr	Numerical Analysis of Surface Force of Diamond-Like Carbon Surface Coated with Monolayer Lubricant Film
title_full_unstemmed	Numerical Analysis of Surface Force of Diamond-Like Carbon Surface Coated with Monolayer Lubricant Film
title_sort	numerical analysis of surface force of diamond-like carbon surface coated with monolayer lubricant film
publisher	Japanese Society of Tribologists
publishDate	2018
url	https://doaj.org/article/9c3411efcb1040dba9a24a95d3da21ff
work_keys_str_mv	AT kyosukeono numericalanalysisofsurfaceforceofdiamondlikecarbonsurfacecoatedwithmonolayerlubricantfilm
_version_	1718444425554690048

Numerical Analysis of Surface Force of Diamond-Like Carbon Surface Coated with Monolayer Lubricant Film

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