Abstract
Graphite/graphene particles were employed as functional fillers to modify hybrid polytetrafluoroethylene/polyisophthaloyl metaphenylene diamine (PTFE/Nomex) fabric-reinforced phenolic composites. The tribology behavior was investigated using a ball-on-disk wear tester, together with a 3D digital microscope. The graphite/graphene exhibits the synergetic effect from the results, which not only reduces the friction efficient but also improves the wear resistance of the composites. Moreover, the wear mechanisms were studied by the wear surface microstructure analysis. It is proposed that the synergetic effect includes mainly the positive rolling effect from the graphene and an improved load-carrying capacity brought by graphite. In addition, in order to obtain the optimized formulation to satisfy the bearing application, the influence of graphite and graphene content on the tribological property of the composites was studied in detail. On the basis of that, the application research was carried out on the bearing oscillating wear test, which will evaluate the engineering service life of the composite.
Highlights
Hybrid fabric composites composed of resin matrix and fibers have been extensively used in the fields of aviation and aerospace owing to their outstanding properties [1,2,3,4,5]
We introduced graphite/graphene to the phenolic resin to improve the tribological tribological property of hybrid PTFE/Nomex fabric composites
Graphite/graphene particles were employed as hybrid fillers to modify hybrid PTFE/Nomex fabric-reinforced phenolic composites
Summary
Hybrid fabric composites composed of resin matrix and fibers have been extensively used in the fields of aviation and aerospace owing to their outstanding properties [1,2,3,4,5]. Polytetrafluoroethylene (PTFE) fibers display a low friction factor, and polyisophthaloyl metaphenylene diamine (Nomex) fibers possess the properties of high strength, high thermal stability, and good resistance to abrasion [6,7,8,9]. These excellent features make PTFE/Nomex fabrics good candidates to be used as tribomaterials. To achieve the tribopotential of fabric composites, phenolic resin is designed to combine with PTFE/Nomex fabrics owing to its good anti-wear and sufficient heat resistance properties [13,14,15]. It is critical to seek promotion on tribological properties for the PTFE/Nomex fabric composite, which is an essential part of the bearing [20,21,22]
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