Rheological Evaluations of Solidified Lubricating Greases and Their Base Oils under Very High Pressure

Some of high-pressure rheology of solidified lubricating greases and their base oils were estimated up to 3.5 GPa by metal microsphere deformation analysis in a diamond-anvil pressure cell (DAC) under the quasi-static compression condition. From aluminum sphere deformation in the greases, the solidi...

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Autores principales:	Yuichi Nakamura, Takashi Yukawa, Sachiko Kubo, Masahito Matsui
Formato:	article
Lenguaje:	EN
Publicado:	Japanese Society of Tribologists 2013
Materias:	lubricating grease high pressure solidification traction coefficient rheology base oil 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/0dc1d64528534abcb7100a47ce1d6ef7
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spelling	oai:doaj.org-article:0dc1d64528534abcb7100a47ce1d6ef72021-11-05T09:24:00ZRheological Evaluations of Solidified Lubricating Greases and Their Base Oils under Very High Pressure1881-219810.2474/trol.8.303https://doaj.org/article/0dc1d64528534abcb7100a47ce1d6ef72013-12-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/trol/8/5/8_303/_pdf/-char/enhttps://doaj.org/toc/1881-2198Some of high-pressure rheology of solidified lubricating greases and their base oils were estimated up to 3.5 GPa by metal microsphere deformation analysis in a diamond-anvil pressure cell (DAC) under the quasi-static compression condition. From aluminum sphere deformation in the greases, the solidification pressures of lithium greases were obtained and were almost the same as those of their base oils. Whereas, the solidification pressures of urea greases were slightly higher than those of their base oils and lithium greases. The solidification pressure was about 0.6 GPa for the traction grease, whereas it was 1.5-1.8 GPa for both PAO greases and MAC greases (space lubricants). Estimated traction coefficients from copper sphere deformation were 0.06-0.07 at 0.6 GPa-2.5 GPa for the traction grease and 0.03-0.04 around 3 GPa for both PAO greases and MAC greases and few difference was found out between greases and their base oils for all the lubricants.Yuichi NakamuraTakashi YukawaSachiko KuboMasahito MatsuiJapanese Society of Tribologistsarticlelubricating grease high pressuresolidificationtraction coefficientrheologybase oilPhysicsQC1-999Engineering (General). Civil engineering (General)TA1-2040Mechanical engineering and machineryTJ1-1570ChemistryQD1-999ENTribology Online, Vol 8, Iss 5, Pp 303-307 (2013)
institution	DOAJ
collection	DOAJ
language	EN
topic	lubricating grease high pressure solidification traction coefficient rheology base oil Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
spellingShingle	lubricating grease high pressure solidification traction coefficient rheology base oil Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999 Yuichi Nakamura Takashi Yukawa Sachiko Kubo Masahito Matsui Rheological Evaluations of Solidified Lubricating Greases and Their Base Oils under Very High Pressure
description	Some of high-pressure rheology of solidified lubricating greases and their base oils were estimated up to 3.5 GPa by metal microsphere deformation analysis in a diamond-anvil pressure cell (DAC) under the quasi-static compression condition. From aluminum sphere deformation in the greases, the solidification pressures of lithium greases were obtained and were almost the same as those of their base oils. Whereas, the solidification pressures of urea greases were slightly higher than those of their base oils and lithium greases. The solidification pressure was about 0.6 GPa for the traction grease, whereas it was 1.5-1.8 GPa for both PAO greases and MAC greases (space lubricants). Estimated traction coefficients from copper sphere deformation were 0.06-0.07 at 0.6 GPa-2.5 GPa for the traction grease and 0.03-0.04 around 3 GPa for both PAO greases and MAC greases and few difference was found out between greases and their base oils for all the lubricants.
format	article
author	Yuichi Nakamura Takashi Yukawa Sachiko Kubo Masahito Matsui
author_facet	Yuichi Nakamura Takashi Yukawa Sachiko Kubo Masahito Matsui
author_sort	Yuichi Nakamura
title	Rheological Evaluations of Solidified Lubricating Greases and Their Base Oils under Very High Pressure
title_short	Rheological Evaluations of Solidified Lubricating Greases and Their Base Oils under Very High Pressure
title_full	Rheological Evaluations of Solidified Lubricating Greases and Their Base Oils under Very High Pressure
title_fullStr	Rheological Evaluations of Solidified Lubricating Greases and Their Base Oils under Very High Pressure
title_full_unstemmed	Rheological Evaluations of Solidified Lubricating Greases and Their Base Oils under Very High Pressure
title_sort	rheological evaluations of solidified lubricating greases and their base oils under very high pressure
publisher	Japanese Society of Tribologists
publishDate	2013
url	https://doaj.org/article/0dc1d64528534abcb7100a47ce1d6ef7
work_keys_str_mv	AT yuichinakamura rheologicalevaluationsofsolidifiedlubricatinggreasesandtheirbaseoilsunderveryhighpressure AT takashiyukawa rheologicalevaluationsofsolidifiedlubricatinggreasesandtheirbaseoilsunderveryhighpressure AT sachikokubo rheologicalevaluationsofsolidifiedlubricatinggreasesandtheirbaseoilsunderveryhighpressure AT masahitomatsui rheologicalevaluationsofsolidifiedlubricatinggreasesandtheirbaseoilsunderveryhighpressure
_version_	1718444328868642816

Rheological Evaluations of Solidified Lubricating Greases and Their Base Oils under Very High Pressure

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