Friction and Wear Properties of Hard Coatings on Steel Surfaces under Lubrication with a Fully Formulated Oil with a Mo Additive

When various sliding components of combustion engines protected with hard coatings are slid with automotive lubricants, unexpected interfacial phenomena may occur because typical automotive lubricants have been formulated with additives suitable for steel/steel sliding components. Therefore, underst...

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Autores principales:	Kiichi Nakagome, Kaisei Sato, Hikaru Okubo, Seiya Watanabe, Shinya Sasaki
Formato:	article
Lenguaje:	EN
Publicado:	Japanese Society of Tribologists 2021
Materias:	hard coatings lubricant additives tribofilm molybdenum disulfide boundary lubrication 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/ecae48f86e9a4827a3500cff9f433c13
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spelling	oai:doaj.org-article:ecae48f86e9a4827a3500cff9f433c132021-11-05T09:30:56ZFriction and Wear Properties of Hard Coatings on Steel Surfaces under Lubrication with a Fully Formulated Oil with a Mo Additive1881-219810.2474/trol.16.59https://doaj.org/article/ecae48f86e9a4827a3500cff9f433c132021-03-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/trol/16/1/16_59/_pdf/-char/enhttps://doaj.org/toc/1881-2198When various sliding components of combustion engines protected with hard coatings are slid with automotive lubricants, unexpected interfacial phenomena may occur because typical automotive lubricants have been formulated with additives suitable for steel/steel sliding components. Therefore, understanding the effects of hard coatings on the performance of lubricant additives is crucial for further improving the lubrication properties of fully formulated oils through the optimization of additive formulations for hard coatings. In this study, friction tests were performed with a steel surface against steel surfaces coated with two ceramic materials and two diamond-like carbon materials under lubrication with a fully formulated oil. Atomic force microscopy and X-ray photoelectron spectroscopic (XPS) investigation of the steel surfaces after the friction tests revealed that the tribofilms comprised a bottom layer composed of calcium compounds and a top layer composed of phosphorous, zinc, and sulfur compounds. The thickness of each layer, which is closely related to the wear property, depends on the hard coating material. Moreover, XPS analysis focusing on the molybdenum element suggested that rate of chemical kinetics to form MoS2 differs among the hard coating materials, and dominantly affects the frictional property.Kiichi NakagomeKaisei SatoHikaru OkuboSeiya WatanabeShinya SasakiJapanese Society of Tribologistsarticlehard coatingslubricant additivestribofilmmolybdenum disulfideboundary lubricationPhysicsQC1-999Engineering (General). Civil engineering (General)TA1-2040Mechanical engineering and machineryTJ1-1570ChemistryQD1-999ENTribology Online, Vol 16, Iss 1, Pp 59-69 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	hard coatings lubricant additives tribofilm molybdenum disulfide boundary lubrication Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
spellingShingle	hard coatings lubricant additives tribofilm molybdenum disulfide boundary lubrication Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999 Kiichi Nakagome Kaisei Sato Hikaru Okubo Seiya Watanabe Shinya Sasaki Friction and Wear Properties of Hard Coatings on Steel Surfaces under Lubrication with a Fully Formulated Oil with a Mo Additive
description	When various sliding components of combustion engines protected with hard coatings are slid with automotive lubricants, unexpected interfacial phenomena may occur because typical automotive lubricants have been formulated with additives suitable for steel/steel sliding components. Therefore, understanding the effects of hard coatings on the performance of lubricant additives is crucial for further improving the lubrication properties of fully formulated oils through the optimization of additive formulations for hard coatings. In this study, friction tests were performed with a steel surface against steel surfaces coated with two ceramic materials and two diamond-like carbon materials under lubrication with a fully formulated oil. Atomic force microscopy and X-ray photoelectron spectroscopic (XPS) investigation of the steel surfaces after the friction tests revealed that the tribofilms comprised a bottom layer composed of calcium compounds and a top layer composed of phosphorous, zinc, and sulfur compounds. The thickness of each layer, which is closely related to the wear property, depends on the hard coating material. Moreover, XPS analysis focusing on the molybdenum element suggested that rate of chemical kinetics to form MoS2 differs among the hard coating materials, and dominantly affects the frictional property.
format	article
author	Kiichi Nakagome Kaisei Sato Hikaru Okubo Seiya Watanabe Shinya Sasaki
author_facet	Kiichi Nakagome Kaisei Sato Hikaru Okubo Seiya Watanabe Shinya Sasaki
author_sort	Kiichi Nakagome
title	Friction and Wear Properties of Hard Coatings on Steel Surfaces under Lubrication with a Fully Formulated Oil with a Mo Additive
title_short	Friction and Wear Properties of Hard Coatings on Steel Surfaces under Lubrication with a Fully Formulated Oil with a Mo Additive
title_full	Friction and Wear Properties of Hard Coatings on Steel Surfaces under Lubrication with a Fully Formulated Oil with a Mo Additive
title_fullStr	Friction and Wear Properties of Hard Coatings on Steel Surfaces under Lubrication with a Fully Formulated Oil with a Mo Additive
title_full_unstemmed	Friction and Wear Properties of Hard Coatings on Steel Surfaces under Lubrication with a Fully Formulated Oil with a Mo Additive
title_sort	friction and wear properties of hard coatings on steel surfaces under lubrication with a fully formulated oil with a mo additive
publisher	Japanese Society of Tribologists
publishDate	2021
url	https://doaj.org/article/ecae48f86e9a4827a3500cff9f433c13
work_keys_str_mv	AT kiichinakagome frictionandwearpropertiesofhardcoatingsonsteelsurfacesunderlubricationwithafullyformulatedoilwithamoadditive AT kaiseisato frictionandwearpropertiesofhardcoatingsonsteelsurfacesunderlubricationwithafullyformulatedoilwithamoadditive AT hikaruokubo frictionandwearpropertiesofhardcoatingsonsteelsurfacesunderlubricationwithafullyformulatedoilwithamoadditive AT seiyawatanabe frictionandwearpropertiesofhardcoatingsonsteelsurfacesunderlubricationwithafullyformulatedoilwithamoadditive AT shinyasasaki frictionandwearpropertiesofhardcoatingsonsteelsurfacesunderlubricationwithafullyformulatedoilwithamoadditive
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Friction and Wear Properties of Hard Coatings on Steel Surfaces under Lubrication with a Fully Formulated Oil with a Mo Additive

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