The Pressure-Viscosity Coefficient of a Perfluorinated Polyether Over a Wide Temperature Range-Reference-Cited by-同舟云学术

The Pressure-Viscosity Coefficient of a Perfluorinated Polyether Over a Wide Temperature Range

Published:2000-03-22 Issue:1 Volume:123 Page:50-53
ISSN:0742-4787
Container-title:Journal of Tribology
language:en
Short-container-title:

Author:

Bair Scott¹

Affiliation:

1. Tribology and Rheology Laboratory, George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332-3273

Abstract

An unbranched perfluoropolyether is the current ball bearing lubricant for deep space flight. We report measurements of viscosity to moderate pressures for the calculation of pressure-viscosity coefficients to temperatures as low as −40°C. A free volume model predicts that a minimum pressure-viscosity coefficient exists at higher temperature. The existence of a minimum αoT is confirmed by viscometry at temperatures to 180°C.

Publisher

ASME International

Subject

Surfaces, Coatings and Films,Surfaces and Interfaces,Mechanical Engineering,Mechanics of Materials

Link

http://asmedigitalcollection.asme.org/tribology/article-pdf/123/1/50/5513559/50_1.pdf

Reference8 articles.

1. Jones, Jr., W. R. , 1995, “Properties of Perfluoropolyethers for Space Applications,” STLE Tribol. Trans., 38, p. 33.

2. Blok, H., 1963, “Inverse Problems in Hydrodynamic Lubrication and Design Directives for Lubricated Flexible Surfaces,” Proceedings of the International Symposium on Lubrication and Wear, McCutchan Publishing Corporation, Berkeley, CA, p. 66.

3. Bair, S. , 1993, “An Experimental Verification of the Significance of the Reciprocal Asymptotic Isoviscous Pressure,” ASLE Tribol. Trans., 36, No. 2, pp. 154–155.

4. Yasutomi, S., Bair, S., and Winer, W. O., 1984, “An Application of a Free Volume Model to Lubricant Rheology 1-Dependence on Temperature and Pressure,” ASME J. Tribol., 106, No. 2, pp. 291–302.

5. Cook, R. L., Herbst, C. A., and King, H. E., 1993, “High-Pressure Viscosity of Glass-Forming Liquids Measured by the Centrifugal Force Diamond Anvil Cell Viscometer,” J. Phys. Chem., 97, No. 10, p. 23592359.

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