The Frictional Properties of Polytetrafluoroethylene Coatings Rubbing a Polyether Polyurethane Material

[+] Author and Article Information
W. A. March, J. P. Kolcun

Chemical Engineering, Rockwell Manufacturing Co., Pittsburgh, Pa.

A. J. Krzysik

University of Pittsburgh, Pittsburgh, Pa.

J. Eng. Ind 92(4), 743-748 (Nov 01, 1970) (6 pages) doi:10.1115/1.3427840 History: Received July 16, 1970; Online July 15, 2010


The frictional properties of several polytetrafluoroethylene (PTFE) coatings versus a 70 Shore D polyether polyurethane valve seat material were evaluated in ambient air, dry mica, and water immersion conditions. Plots were made of coefficient of friction versus time. The frictional properties of one of the coatings was dependent on its thermal history during curing. Of particular interest was the maximum and reversal in coefficient of friction noted for some of the coatings. From the data obtained in the mica immersions an estimate of the comparative wear life of the coatings was made. The mechanism involved in visco-elastic friction is discussed.

Copyright © 1970 by ASME
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