Abstract
The tribological properties of polytetrafluoroethylene (PTFE)/AP (poly(para-phenyleneterephthalamide) (PPTA) pulp) composites under different test conditions (load: 2N, 10N; frequency: 1 Hz, 4 Hz; amplitude: 2 mm, 8 mm) were holistically evaluated. PTFE/AP composites with different AP mass ratios of 3%, 6%, and 12% as a skeleton support material were prepared. The coefficient of friction (COF) and wear rate were determined on a ball-on-disk tribometer. Furthermore, the morphology, element composition, and chemical structure of the transfer membrane were analyzed accordingly. The relationships between load, frequency, amplitude, and tribological properties were further investigated. According to the wear mechanism, AP enables effective improvement in the stiffness and wear resistance, which is also conducive to the formation of transfer films.
Highlights
Polytetrafluoroethylene (PTFE) composites are widely used as lubricating materials on account of good mechanical and tribological properties [1]
With the increase in AP content, the tensile and compressive properties of composites are improved, which undoubtedly plays a positive role in tribological properties
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Summary
Polytetrafluoroethylene (PTFE) composites are widely used as lubricating materials on account of good mechanical and tribological properties [1]. The unique structure of PTFE results in poor wear resistance, which can be overcome by adding fillers to improve tribological properties by means of nanoparticle filling [2,3], fiber material blending [4,5], and surface modification [6]. Fiber reinforcement has demonstrated rapid growth and development This is because the matrix can effectively transfer the load to the fibers to improve the bearing capacity of polymer-based composites [7]. Different from aramid particle-reinforced materials, the main wear form of PTFE/aramid fabric composites is adhesive wear, and the more continuous and uniform transfer film can effectively reduce the wear degree [26]. The silane coupling agent solves the problem of poor adhesion between the fiber and the matrix
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