In Situ Observation of Transient Responses in Grease Lubrication by Micro Infrared Spectroscopy

In situ observation of lubricant films formed with greases was carried out at EHL conditions with a micro-FTIR. Three urea compounds were used as a thickener and 12 mass percent of the thickener was added in PAO, respectively. From the IR spectra, CH and NH stretching vibration peaks were observed f...

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Autores principales:	Yasushi Hoshi, Koji Takiwatari, Hidetaka Nanao, Shigeyuki Mori
Formato:	article
Lenguaje:	EN
Publicado:	Japanese Society of Tribologists 2020
Materias:	grease urea thickener film thickness concentration ehl in situ ftir 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/8a5427a0c09a444a939e302011cced5f
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spelling	oai:doaj.org-article:8a5427a0c09a444a939e302011cced5f2021-11-05T09:08:00ZIn Situ Observation of Transient Responses in Grease Lubrication by Micro Infrared Spectroscopy1881-219810.2474/trol.15.201https://doaj.org/article/8a5427a0c09a444a939e302011cced5f2020-07-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/trol/15/4/15_201/_pdf/-char/enhttps://doaj.org/toc/1881-2198In situ observation of lubricant films formed with greases was carried out at EHL conditions with a micro-FTIR. Three urea compounds were used as a thickener and 12 mass percent of the thickener was added in PAO, respectively. From the IR spectra, CH and NH stretching vibration peaks were observed from urea greases. The film thickness and the concentration of thickener were estimated from the absorbance of CH and the ratio of absorbance of NH and CH. Two-dimensional distribution of the thickness and the concentration around Hertzian contact was obtained at the resolution of 50 μm. The thickener of urea grease was concentrated on ball and disk surfaces. It was found that the concentrate on thickener at Hertzian contact region was dependent on thickener itself. Time dependence of the thickness and the concentration at Hertzian contact were obtained at the resolution of 45 s under shearing conditions. The film thickness of urea greases at Hertzian contact was greatly decreased by shearing and the film thickness and the concentration were recovered when the condition was changed to rolling. This behavior was supposed with detachment and growth of the adhered film of the thickener. Lubricating characteristics of urea greases were discussed based on the concentration of thickener at Hertzian contact.Yasushi HoshiKoji TakiwatariHidetaka NanaoShigeyuki MoriJapanese Society of Tribologistsarticlegreaseureathickenerfilm thicknessconcentrationehlin situftirPhysicsQC1-999Engineering (General). Civil engineering (General)TA1-2040Mechanical engineering and machineryTJ1-1570ChemistryQD1-999ENTribology Online, Vol 15, Iss 4, Pp 201-208 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	grease urea thickener film thickness concentration ehl in situ ftir Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
spellingShingle	grease urea thickener film thickness concentration ehl in situ ftir Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999 Yasushi Hoshi Koji Takiwatari Hidetaka Nanao Shigeyuki Mori In Situ Observation of Transient Responses in Grease Lubrication by Micro Infrared Spectroscopy
description	In situ observation of lubricant films formed with greases was carried out at EHL conditions with a micro-FTIR. Three urea compounds were used as a thickener and 12 mass percent of the thickener was added in PAO, respectively. From the IR spectra, CH and NH stretching vibration peaks were observed from urea greases. The film thickness and the concentration of thickener were estimated from the absorbance of CH and the ratio of absorbance of NH and CH. Two-dimensional distribution of the thickness and the concentration around Hertzian contact was obtained at the resolution of 50 μm. The thickener of urea grease was concentrated on ball and disk surfaces. It was found that the concentrate on thickener at Hertzian contact region was dependent on thickener itself. Time dependence of the thickness and the concentration at Hertzian contact were obtained at the resolution of 45 s under shearing conditions. The film thickness of urea greases at Hertzian contact was greatly decreased by shearing and the film thickness and the concentration were recovered when the condition was changed to rolling. This behavior was supposed with detachment and growth of the adhered film of the thickener. Lubricating characteristics of urea greases were discussed based on the concentration of thickener at Hertzian contact.
format	article
author	Yasushi Hoshi Koji Takiwatari Hidetaka Nanao Shigeyuki Mori
author_facet	Yasushi Hoshi Koji Takiwatari Hidetaka Nanao Shigeyuki Mori
author_sort	Yasushi Hoshi
title	In Situ Observation of Transient Responses in Grease Lubrication by Micro Infrared Spectroscopy
title_short	In Situ Observation of Transient Responses in Grease Lubrication by Micro Infrared Spectroscopy
title_full	In Situ Observation of Transient Responses in Grease Lubrication by Micro Infrared Spectroscopy
title_fullStr	In Situ Observation of Transient Responses in Grease Lubrication by Micro Infrared Spectroscopy
title_full_unstemmed	In Situ Observation of Transient Responses in Grease Lubrication by Micro Infrared Spectroscopy
title_sort	in situ observation of transient responses in grease lubrication by micro infrared spectroscopy
publisher	Japanese Society of Tribologists
publishDate	2020
url	https://doaj.org/article/8a5427a0c09a444a939e302011cced5f
work_keys_str_mv	AT yasushihoshi insituobservationoftransientresponsesingreaselubricationbymicroinfraredspectroscopy AT kojitakiwatari insituobservationoftransientresponsesingreaselubricationbymicroinfraredspectroscopy AT hidetakananao insituobservationoftransientresponsesingreaselubricationbymicroinfraredspectroscopy AT shigeyukimori insituobservationoftransientresponsesingreaselubricationbymicroinfraredspectroscopy
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In Situ Observation of Transient Responses in Grease Lubrication by Micro Infrared Spectroscopy

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