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Abstract
The tribological properties of three grades of polyimide (PI) and one grade of poly(amide-imide) (PAI) polymers are evaluated in a tetrafluoroethane (HFC-134a) environment. Friction coefficient, wear, and interface surface morphology are evaluated at temperatures of 20° and 120°C, sliding velocities from 0.127 to 3.75 m/s, contact pressures from 1.72 to 13.8 MPa, and counterface surface roughness of 0.06 and 0.40 μ Ra. Tests were conducted under dry or boundary lubricated conditions. Limited testing indicate that the polymers under study do not chemically degrade in HFC-134a environment. For the polymer grades tested, the combination of graphite and FIFE as filler materials provide the best wear characteristics in this environment. As expected, the environmental temperature has a strong effect on both the friction coefficient and the wear. Under boundary lubricated conditions, the presence of a liquid lubricant provides one order of magnitude lower wear compared to the wear obtained in dry sliding conditions. Results from tests conducted in air, argon, and HFC-134a show that the tribological properties of the polymers tested do not seem to be significantly influenced by the environment.
Presented at the 50th Annual Meeting in Chicago, Illinois May 14–19, 1995
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Presented at the 50th Annual Meeting in Chicago, Illinois May 14–19, 1995
