An investigation of thermal and tribological behaviors of PTFE-based silicon composites filled with AlN and flake graphite particles

作者：Xi, Xiang; Xia, Yan-Qiu^*

来源：Journal of Applied Polymer Science, 2017, 134(36): 45263.

DOI：10.1002/app.45263

• composites
• electrical properties
• friction
• thermal properties
• wear and lubrication

The thermal and tribological properties of silicon composites were improved by choosing polytetrafluoroethylene (PTFE) as a thickener and alumina nitride (AlN) and flake graphite (FG) as thermal conductive additives, producing AlN-modified, FG-modified, and AlN/FG-modified PTFE-based thermal silicon composites (AlN-PTSC, FG-PTSC, and AlN/FG-PTSC, respectively). Three-dimensional network-configuration representative volume element models were built to investigate the thermal properties of these composites by applying a Monte Carlo, controllable, spatial distribution algorithm. The composites' thermal conductivity and volume resistance were also measured. Tribological tests were conducted using a ball-on-disk reciprocating friction and wear tester. Scanning electron microscopy and energy dispersive spectroscopy were used to analyze the morphologies and elements of worn surfaces. The results showed that AlN/FG-PTSC possessed the best thermal properties, which were ascribed to a compact thermal conductive network; thermal conductivity was 88.8% and 44.8% greater than the highest value of AlN-PTSC and FG-PTSC, respectively. The numerical values of thermal conductivity were in a good agreement with experimental results. The optimal electrical tribological properties of AlN/FG-PTSC were ascribed to the functions of thermal and electrical properties combined, which could be helpful in abating the arc erosion on friction contacts.

• 出版日期2017-9-20
• 单位华北电力大学（保定）; 华北电力大学