In Situ Observation of EHL Films of Greases by Micro Infrared Spectroscopy
In situ observation of lubricant films formed with greases was performed with a micro Fourier transform infrared spectrometer (FT-IR) under elastohydrodynamic lubrication (EHL) conditions between a steel ball and a single-crystal silicon disk. Twelve mass percent of lithium stearate or aromatic-type...
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Japanese Society of Tribologists
2019
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oai:doaj.org-article:e690afb9e66743dfa508beb1e02b6fa32021-11-05T09:18:04ZIn Situ Observation of EHL Films of Greases by Micro Infrared Spectroscopy1881-219810.2474/trol.14.53https://doaj.org/article/e690afb9e66743dfa508beb1e02b6fa32019-06-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/trol/14/2/14_53/_pdf/-char/enhttps://doaj.org/toc/1881-2198In situ observation of lubricant films formed with greases was performed with a micro Fourier transform infrared spectrometer (FT-IR) under elastohydrodynamic lubrication (EHL) conditions between a steel ball and a single-crystal silicon disk. Twelve mass percent of lithium stearate or aromatic-type urea compound were added as thickener to polyalphaolefin base oil. Peaks relating to CH, C=O and NH were monitored in the FT-IR analysis. The film thickness and the concentration of thickener were estimated from the absorbance of CH and the ratio of absorbance of C=O and CH. Two-dimensional distribution of the thickness and the concentration around EHL contact was obtained at a resolution of 50 μm. It was found that the concentration of thickener at EHL contact area was dependent on the type of thickener. Although the concentration of Li grease decreased at the EHL contact area, that of urea increased even at low entrainment speed. The thickener of urea grease was concentrated on the ball and the disk surfaces. The film thickness at EHL contact of each grease can be explained by the concentration of thickener at the contact. Lubricating characteristics of urea grease are discussed based on the concentration of thickener at the EHL contact.Yasushi HoshiKoji TakiwatariHidetaka NanaoHitoshi YashiroShigeyuki MoriJapanese Society of Tribologistsarticlegreasethickenerfilm thicknessconcentrationehlin situftirPhysicsQC1-999Engineering (General). Civil engineering (General)TA1-2040Mechanical engineering and machineryTJ1-1570ChemistryQD1-999ENTribology Online, Vol 14, Iss 2, Pp 53-59 (2019) |
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DOAJ |
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grease 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 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 Hitoshi Yashiro Shigeyuki Mori In Situ Observation of EHL Films of Greases by Micro Infrared Spectroscopy |
| description |
In situ observation of lubricant films formed with greases was performed with a micro Fourier transform infrared spectrometer (FT-IR) under elastohydrodynamic lubrication (EHL) conditions between a steel ball and a single-crystal silicon disk. Twelve mass percent of lithium stearate or aromatic-type urea compound were added as thickener to polyalphaolefin base oil. Peaks relating to CH, C=O and NH were monitored in the FT-IR analysis. The film thickness and the concentration of thickener were estimated from the absorbance of CH and the ratio of absorbance of C=O and CH. Two-dimensional distribution of the thickness and the concentration around EHL contact was obtained at a resolution of 50 μm. It was found that the concentration of thickener at EHL contact area was dependent on the type of thickener. Although the concentration of Li grease decreased at the EHL contact area, that of urea increased even at low entrainment speed. The thickener of urea grease was concentrated on the ball and the disk surfaces. The film thickness at EHL contact of each grease can be explained by the concentration of thickener at the contact. Lubricating characteristics of urea grease are discussed based on the concentration of thickener at the EHL contact. |
| format |
article |
| author |
Yasushi Hoshi Koji Takiwatari Hidetaka Nanao Hitoshi Yashiro Shigeyuki Mori |
| author_facet |
Yasushi Hoshi Koji Takiwatari Hidetaka Nanao Hitoshi Yashiro Shigeyuki Mori |
| author_sort |
Yasushi Hoshi |
| title |
In Situ Observation of EHL Films of Greases by Micro Infrared Spectroscopy |
| title_short |
In Situ Observation of EHL Films of Greases by Micro Infrared Spectroscopy |
| title_full |
In Situ Observation of EHL Films of Greases by Micro Infrared Spectroscopy |
| title_fullStr |
In Situ Observation of EHL Films of Greases by Micro Infrared Spectroscopy |
| title_full_unstemmed |
In Situ Observation of EHL Films of Greases by Micro Infrared Spectroscopy |
| title_sort |
in situ observation of ehl films of greases by micro infrared spectroscopy |
| publisher |
Japanese Society of Tribologists |
| publishDate |
2019 |
| url |
https://doaj.org/article/e690afb9e66743dfa508beb1e02b6fa3 |
| work_keys_str_mv |
AT yasushihoshi insituobservationofehlfilmsofgreasesbymicroinfraredspectroscopy AT kojitakiwatari insituobservationofehlfilmsofgreasesbymicroinfraredspectroscopy AT hidetakananao insituobservationofehlfilmsofgreasesbymicroinfraredspectroscopy AT hitoshiyashiro insituobservationofehlfilmsofgreasesbymicroinfraredspectroscopy AT shigeyukimori insituobservationofehlfilmsofgreasesbymicroinfraredspectroscopy |
| _version_ |
1718444441888358400 |