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Fusaro, Peter C.; James, Tom

doi:10.1057/9780230510968_6

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“…Because of self-lubricating ability and strength, PI should replace engineering materials under high load, sliding velocity, and temperature. While PI demonstrated excellent sliding properties under vacuum [4], they strongly depend on the development of a transfer film on the counterface under ambient atmosphere: low friction and wear rates are often not observed own to differences between smooth and lumpy transfer [5]. The tribological properties of PI can be controlled by reinforcements or internal lubrication with graphite [6] or molybdenium disulphide (MoS 2 ) [7].…”

Section: Introductionmentioning

confidence: 99%

Tribological properties of PTFE‐filled thermoplastic polyimide at high load, velocity, and temperature

Samyn

Schoukens

2009

Polymer Composites

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The effect of 20 wt% polytetrafluoroethylene (PTFE) fillers on the friction and wear properties of thermoplastic polyimides (TP) are investigated, under dry sliding in line contact against steel under 50 to 200 N, 0.3 to 1.2 m/s, and 60 to 2608C. Besides the lubricating mechanisms of PTFE based on mechanical shear, the thermal and tribophysical interactions in the sliding interface are considered in this research by using thermoanalytical measurements, Raman spectroscopy, and calculating the maximum polymer sliding temperature T*. The effect of hydrolysis of the TP bulk material, causing high friction at 100 to 1408C, is covered by PTFE. A transition at pv-values 2.2 MPa m/s (T* ¼ 1208C) is due to thermally controlled sliding of PTFE, while a transition at pv-values 3.2 MPa m/s (T* ¼ 1808C) remains controlled by degradation of the TP bulk material into monomer fractions. The reduced coefficient of friction in the presence of PTFE leads to smaller degradation and orientation of the molecular back-bone and side-chains within the TP structure. The formation of a homogeneously mixed transfer film is only observed at 180 to 2608C. The PTFE forms a fibrillar structure during wear at high sliding velocities, while they wear as separate particles at high normal loads.

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Section: Introductionmentioning

confidence: 99%