JOURNAL OF JAPANESE SOCIETY OF TRIBOLOGISTS
Online ISSN : 2189-9967
Print ISSN : 0915-1168
ISSN-L : 0915-1168
Volume 62 , Issue 4
Special Issue on Recent Trends in Sealing Technology
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Announcement
Contents
Winners of 2016
Special Issue on Recent Trends in Sealing Technology
Explanation
Technical Information Tribo-Tool Development for the Breakthrough
Short Paper
  • Hidetaka NANAO, Yasushi HOSHI, Koji TAKIWATARI, Shigeyuki MORI
    2017 Volume 62 Issue 4 Pages 296-299
    Published: April 15, 2017
    Released: April 15, 2017
    [Advance publication] Released: February 03, 2017
    JOURNALS FREE ACCESS

    In situ observation of lubricant films formed with greases was carried out at EHL (Elastohydrodynamic Lubrication) conditions with a micro-FTIR (Fourier Transform Infrared Spectroscopy). Three urea greases were used and 12 mass percent of the thickener was added in PAO (Poly-α-Olefin). From the in situ IR spectra, the film thickness and the concentration of thickener were estimated from the absorbance of C-H stretching vibration and the ratio of absorbance of N-H and C-H stretching vibration, respectively. Tribo-tests were carried out in sliding/rolling conditions, typically between 0% SRR (Slide/Roll Ratio) and 70% SRR. The traction coefficients were measured with a torque meter attached to the ball shaft. Each thickener was concentrated on ball and disk surfaces. It was found that the concentration of thickener at the Hertzian contact region was dependent on thickener itself under sliding/rolling conditions. It was suggested that an adhesion film by grease thickener had affected on the traction coefficient.

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