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Abstract
The high specific-strength of glass fibers and exceptional self-lubrication of polytetrafluoroethylene (PTFE) fibers promote the potential application of hybrid PTFE/glass fabric composites in the tribological field, but their weak interfacial adhesion and inferior thermal properties significantly inhibit their tribological performance and reliability. Herein, a hybrid of polydopamine/silicon carbide/polyethyleneimine (PDA/SiC/PEI) functional coating was co-deposited onto the hybrid PTFE/glass fabric surface through a one-step impregnation method, leading to increased surface roughness and abundant amine groups. Tensile and peeling tests showed that this functional coating offered 47.8% enhancement in the fabric/matrix interfacial adhesion without compromising the strength of the pristine fabric. Moreover, the additional incorporation of WS2, and aluminum nitride (AlN) micro-fillers contributed to the development of a high-quality tribofilm and improved the thermal properties of fabric composites. The results of wear tests proved that the hybrid-fabric composites, after the introduction of functional coating and micro-fillers, exhibited outstanding tribological performance, which was attributed to the superior interfacial adhesion as well as the synergistic enhancement effects between WS2 and AlN micro-fillers.
Highlights
Fiber reinforced polymer (FRP) composites have attracted considerable attention in land vehicles, wind turbine blades, and aircraft because of their low-density, high specific strength/stiffness, outstanding fatigue/ corrosion resistance, and excellent designability [1,2,3,4,5,6]
Inorganic nanomaterials can further be incorporated into the PDA/PEI co-deposition solution to design hybrid functional coatings, to combine the merits of inorganic nanomaterials and PDA/PEI copolymer coating as well as to generate synergistic effects between them
A PDA/silicon carbide (SiC)/PEI coating was co-deposited onto the hybrid PTFE/glass fabric surfaces to construct an organic-inorganic hybrid functional coating with different amounts of SiC nanoparticles
Summary
Fiber reinforced polymer (FRP) composites have attracted considerable attention in land vehicles, wind turbine blades, and aircraft because of their low-density, high specific strength/stiffness, outstanding fatigue/ corrosion resistance, and excellent designability [1,2,3,4,5,6]. It has been noted that the introduction of solid lubricants, for example, graphite, graphitic carbon nitride (g-C3N4), MoS2, and WS2, into the polymer matrix contributes to the formation of solid lubricant tribofilms on the counterface owing to their layered structures [32,33,34] Based on these by the above considerations, it is expected that the combination of thermally conductive fillers and solid lubricants can generate a synergetic effect improving the tribological performance of polymer composites. We develop a facile and scalable technique to improve the interfacial adhesion between hybrid PTFE/glass fabric and a phenolic resin matrix by co-depositing PDA/PEI with silicon carbide (SiC) nanoparticles onto fabric surfaces Both the AlN and WS2 micro-fillers were added to the hybrid-fabric composites to enhance the thermal properties and to contribute to the formation of a solid lubricant tribofilm. The tribological characteristics and internal wear mechanism of pristine and modified hybrid-fabric composites are discussed
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