Tribology of Graphite-Filled Polystyrene

Abstract

Self-lubricating polymer compounds are currently used for a wide range of applications such as bearings, gears, and water meters. Under severe conditions such as high pressure, high velocity, and/or high temperatures, the material fails (PV limit). In this study, we investigated the effect of graphite on the tribological properties of polystyrene (PS) with "ball-on-three-plates" tests. Graphite-filled PS plates were produced via an internal mixer and compression molding. Unhardened steel (1.4401) and nylon (PA66) balls were used for the tribological tests. Our results indicate that graphite loading, graphite type, and particle size have a big influence on the friction coefficient, the wear resistance, and the PV limit of PS both against steel and PA66. In particular, primary synthetic graphite performs better than secondary synthetic graphite due to the higher degree of crystallinity.

The tribological properties of lubricating greases produced on vegetable base and modified of polytetrafluoroethylene

“…) with a concentric plate-ball contact point, in which three fixed cuboid steel plates were pressed with adequate force through a ball fixed in the spindle, rotating at the appropriate speed. The tribological device enables the execution of tests in the temperature range of -40÷200°C [21][22][23][24][25][26]. The balls with a diameter of 12.7 mm and plates with dimensions of 15 × 5 × 2 mm were made of bearing steel ŁH 15 (Ra = 0,3 µm; hardness 60-63 HRC).…”

“…The balls with a diameter of 12.7 mm and plates with dimensions of 15 × 5 × 2 mm were made of bearing steel ŁH 15 (Ra = 0,3 µm; hardness 60-63 HRC). During the tests, immersion lubrication was used [21][22][23]. Tribological tests (measurement of wear limit -Goz) were carried out at the tribosystem at 39.24 N, rotational speed of 500 rpm, during 3600 s and temperature of 20 o C. Before starting the tribological attachment, the plates were placed in the holder, pressed with springs, lubricant was introduced (approx.5 cm 3 ) and stabilized for 60 s at a set temperature.…”

Effect of Expanded Graphite on Mechanical and Tribological Properties of Polyamide 6/Glass Fibre Composites

“…The COF and wear of polystyrene (PS) against steel were much higher than those against PA66. Besides, the graphite particle size played an important role against steel, but not against PA66 [15].…”

Uniformly distributed graphite with dual attributes to achieve enhanced mechanical and tribological properties of PEK-C/graphite composites via a precipitation method

“…The tribological and mechanical properties of composites are influenced by their phase structure, including filler size, amount, shape and distribution, and the interface strength between the matrix resin and filler. [10][11][12][13][14][15] Lu et al illustrated that the frictional coefficient and wear rate of PEEK were obviously decreased when graphite was added. 6 The relationship between graphite size and the performance of composites with graphite has been investigated by Shang and Zhao et al 3 They reported that both the anti-wear and mechanical properties of PEEK/ graphite composites were enhanced as the particle size decreased from 150 to 10 mm.…”