Viscosity Loss in PFPE Lubricant for Space Applications under EHL Conditions

An unbranched perfluoropolyether (PFPE) 815Z is the current ball bearing lubricant for space applications. Measurements of elastohydrodynamic lubrication (EHL) oil film thickness have been carried out to assess the lubricating performance of PFPE with average molecular weight of 9200 using an optica...

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Autores principales:	Sobahan Mia, Hidekazu Komiya, Shinichiro Hayashi, Shigeki Morita, Nobuyoshi Ohno, Shingo Obara
Formato:	article
Lenguaje:	EN
Publicado:	Japanese Society of Tribologists 2007
Materias:	viscosity loss pfpe space application thrust ball bearing molecular decomposition ehl 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/b3caffdd3229434d882372474a275275
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spelling	oai:doaj.org-article:b3caffdd3229434d882372474a2752752021-11-05T09:29:57ZViscosity Loss in PFPE Lubricant for Space Applications under EHL Conditions1881-219810.2474/trol.2.54https://doaj.org/article/b3caffdd3229434d882372474a2752752007-06-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/trol/2/2/2_2_54/_pdf/-char/enhttps://doaj.org/toc/1881-2198An unbranched perfluoropolyether (PFPE) 815Z is the current ball bearing lubricant for space applications. Measurements of elastohydrodynamic lubrication (EHL) oil film thickness have been carried out to assess the lubricating performance of PFPE with average molecular weight of 9200 using an optical interferometric technique under mean Hertzian pressure 0.45 GPa. The film thickness of 815Z became less than predicted film thickness from Hamrock and Dowson formula for EHL central film thickness. There are two main explanations why PFPE is inferior to mineral oil in their ability to form EHL films, temporary viscosity loss and permanent viscosity loss. In order to elucidate the results, measurements of permanent viscosity loss under mean Hertzian pressure from 0.41 GPa to 2.67 GPa have been carried out using the thrust ball bearing. There results show that the degree of the permanent viscosity loss depends on Hertzian pressure, occurrence of permanent viscosity loss of 36 % with 2.67 GPa and 2 % with 0.41 GPa.Sobahan MiaHidekazu KomiyaShinichiro HayashiShigeki MoritaNobuyoshi OhnoShingo ObaraJapanese Society of Tribologistsarticleviscosity losspfpespace applicationthrust ball bearingmolecular decompositionehlPhysicsQC1-999Engineering (General). Civil engineering (General)TA1-2040Mechanical engineering and machineryTJ1-1570ChemistryQD1-999ENTribology Online, Vol 2, Iss 2, Pp 54-58 (2007)
institution	DOAJ
collection	DOAJ
language	EN
topic	viscosity loss pfpe space application thrust ball bearing molecular decomposition ehl Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
spellingShingle	viscosity loss pfpe space application thrust ball bearing molecular decomposition ehl Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999 Sobahan Mia Hidekazu Komiya Shinichiro Hayashi Shigeki Morita Nobuyoshi Ohno Shingo Obara Viscosity Loss in PFPE Lubricant for Space Applications under EHL Conditions
description	An unbranched perfluoropolyether (PFPE) 815Z is the current ball bearing lubricant for space applications. Measurements of elastohydrodynamic lubrication (EHL) oil film thickness have been carried out to assess the lubricating performance of PFPE with average molecular weight of 9200 using an optical interferometric technique under mean Hertzian pressure 0.45 GPa. The film thickness of 815Z became less than predicted film thickness from Hamrock and Dowson formula for EHL central film thickness. There are two main explanations why PFPE is inferior to mineral oil in their ability to form EHL films, temporary viscosity loss and permanent viscosity loss. In order to elucidate the results, measurements of permanent viscosity loss under mean Hertzian pressure from 0.41 GPa to 2.67 GPa have been carried out using the thrust ball bearing. There results show that the degree of the permanent viscosity loss depends on Hertzian pressure, occurrence of permanent viscosity loss of 36 % with 2.67 GPa and 2 % with 0.41 GPa.
format	article
author	Sobahan Mia Hidekazu Komiya Shinichiro Hayashi Shigeki Morita Nobuyoshi Ohno Shingo Obara
author_facet	Sobahan Mia Hidekazu Komiya Shinichiro Hayashi Shigeki Morita Nobuyoshi Ohno Shingo Obara
author_sort	Sobahan Mia
title	Viscosity Loss in PFPE Lubricant for Space Applications under EHL Conditions
title_short	Viscosity Loss in PFPE Lubricant for Space Applications under EHL Conditions
title_full	Viscosity Loss in PFPE Lubricant for Space Applications under EHL Conditions
title_fullStr	Viscosity Loss in PFPE Lubricant for Space Applications under EHL Conditions
title_full_unstemmed	Viscosity Loss in PFPE Lubricant for Space Applications under EHL Conditions
title_sort	viscosity loss in pfpe lubricant for space applications under ehl conditions
publisher	Japanese Society of Tribologists
publishDate	2007
url	https://doaj.org/article/b3caffdd3229434d882372474a275275
work_keys_str_mv	AT sobahanmia viscositylossinpfpelubricantforspaceapplicationsunderehlconditions AT hidekazukomiya viscositylossinpfpelubricantforspaceapplicationsunderehlconditions AT shinichirohayashi viscositylossinpfpelubricantforspaceapplicationsunderehlconditions AT shigekimorita viscositylossinpfpelubricantforspaceapplicationsunderehlconditions AT nobuyoshiohno viscositylossinpfpelubricantforspaceapplicationsunderehlconditions AT shingoobara viscositylossinpfpelubricantforspaceapplicationsunderehlconditions
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Viscosity Loss in PFPE Lubricant for Space Applications under EHL Conditions

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