Elucidation of Lubrication Mechanism of Vegetable Oils and Their Effective Application

From the viewpoint of natural environmental requirement, the applications of biodegradable lubricants are growing. Most of vegetable oils are biodegradable and have good lubricating performance even at high contact pressure conditions in spite of their lower pressure-viscosity coefficient. In vegeta...

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Autores principales:	Teruo Murakami, Hiroshi Sakamoto
Formato:	article
Lenguaje:	EN
Publicado:	Japanese Society of Tribologists 2008
Materias:	biodegradable oil vegetable oil friction polymer antioxidant additive unsaturated fatty acid 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/dbdd2267e4ea443fbe2c138403ab7f1e
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spelling	oai:doaj.org-article:dbdd2267e4ea443fbe2c138403ab7f1e2021-11-05T09:28:53ZElucidation of Lubrication Mechanism of Vegetable Oils and Their Effective Application1881-219810.2474/trol.3.274https://doaj.org/article/dbdd2267e4ea443fbe2c138403ab7f1e2008-10-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/trol/3/5/3_5_274/_pdf/-char/enhttps://doaj.org/toc/1881-2198From the viewpoint of natural environmental requirement, the applications of biodegradable lubricants are growing. Most of vegetable oils are biodegradable and have good lubricating performance even at high contact pressure conditions in spite of their lower pressure-viscosity coefficient. In vegetable oils, however, the optimum suppression of oxidative degradation is required to improve the longevity of vegetable oils. Therefore, it is required to clarify the actual lubrication mechanism in vegetable oils with appropriate antioxidant additives. In this study, the tribological properties of four kinds of vegetable oils of different composition were evaluated in four-ball tests at different sliding speed conditions. As an antioxidant additive, α-tocopherol was used. The types of fatty acids in triglycerides appeared to control the lubricating performance through adsorbed film and friction polymer formation, depending on the operating conditions. Therefore, the paraffinic oils containing fatty acid were tested. It was shown that the influences of fatty acid types on lubricating performance were different depending on sliding speeds. These differences are discussed from the viewpoints of the role of friction polymer and oxidation of oils evaluated by FTIR analyses. Finally, effective application of various vegetable oils is discussed on the basis of relationship between tribological behaviors and operating conditions.Teruo MurakamiHiroshi SakamotoJapanese Society of Tribologistsarticlebiodegradable oilvegetable oilfriction polymerantioxidant additiveunsaturated fatty acidPhysicsQC1-999Engineering (General). Civil engineering (General)TA1-2040Mechanical engineering and machineryTJ1-1570ChemistryQD1-999ENTribology Online, Vol 3, Iss 5, Pp 274-279 (2008)
institution	DOAJ
collection	DOAJ
language	EN
topic	biodegradable oil vegetable oil friction polymer antioxidant additive unsaturated fatty acid Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
spellingShingle	biodegradable oil vegetable oil friction polymer antioxidant additive unsaturated fatty acid Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999 Teruo Murakami Hiroshi Sakamoto Elucidation of Lubrication Mechanism of Vegetable Oils and Their Effective Application
description	From the viewpoint of natural environmental requirement, the applications of biodegradable lubricants are growing. Most of vegetable oils are biodegradable and have good lubricating performance even at high contact pressure conditions in spite of their lower pressure-viscosity coefficient. In vegetable oils, however, the optimum suppression of oxidative degradation is required to improve the longevity of vegetable oils. Therefore, it is required to clarify the actual lubrication mechanism in vegetable oils with appropriate antioxidant additives. In this study, the tribological properties of four kinds of vegetable oils of different composition were evaluated in four-ball tests at different sliding speed conditions. As an antioxidant additive, α-tocopherol was used. The types of fatty acids in triglycerides appeared to control the lubricating performance through adsorbed film and friction polymer formation, depending on the operating conditions. Therefore, the paraffinic oils containing fatty acid were tested. It was shown that the influences of fatty acid types on lubricating performance were different depending on sliding speeds. These differences are discussed from the viewpoints of the role of friction polymer and oxidation of oils evaluated by FTIR analyses. Finally, effective application of various vegetable oils is discussed on the basis of relationship between tribological behaviors and operating conditions.
format	article
author	Teruo Murakami Hiroshi Sakamoto
author_facet	Teruo Murakami Hiroshi Sakamoto
author_sort	Teruo Murakami
title	Elucidation of Lubrication Mechanism of Vegetable Oils and Their Effective Application
title_short	Elucidation of Lubrication Mechanism of Vegetable Oils and Their Effective Application
title_full	Elucidation of Lubrication Mechanism of Vegetable Oils and Their Effective Application
title_fullStr	Elucidation of Lubrication Mechanism of Vegetable Oils and Their Effective Application
title_full_unstemmed	Elucidation of Lubrication Mechanism of Vegetable Oils and Their Effective Application
title_sort	elucidation of lubrication mechanism of vegetable oils and their effective application
publisher	Japanese Society of Tribologists
publishDate	2008
url	https://doaj.org/article/dbdd2267e4ea443fbe2c138403ab7f1e
work_keys_str_mv	AT teruomurakami elucidationoflubricationmechanismofvegetableoilsandtheireffectiveapplication AT hiroshisakamoto elucidationoflubricationmechanismofvegetableoilsandtheireffectiveapplication
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Elucidation of Lubrication Mechanism of Vegetable Oils and Their Effective Application

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