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Open Access Research Article Just Accepted
The effects of popcorn-like CeO2 decorated Cr2AlC hybrid on the tribological properties of CF/PTFE fabric composites
Friction
Available online: 21 April 2025
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In this study, Cerium oxide (CeO2) nanoflowers were uniformly grown on the surface of chromium aluminum carbide (Cr2AlC) particles via a simple and efficient co-precipitation approach, which resulted in the preparation of the hybrids referred to as Cr2AlC@CeO2. The CeO2 nanoparticles exhibited a capacity to alternate between the oxidation states of Ce3+ and Ce4+ under stress, forming a protective layer to repair damaged surfaces and reduce friction and wear at the nanoscale. The Cr2AlC@CeO2 hybrids were utilized to enhance the tribological performance of carbon fiber (CF) and polytetrafluoroethylene fiber (PTFE) blended fabrics (CF/PTFE fabric) phenolic composites, and the friction test indicated that when the filler content reached 4.0 wt%, the wear rate of the fabric composites was 2.79×10-14 m3 (N·m)-1, which was 59% lower than that of the pure composites, and the coefficient of friction was decreased by 39%. This enhancement was attributed to the formation of an adaptive tribofilm with a thickness ranging from 85 nm to 113 nm on the corresponding surface. The analysis of the worn surface and the tribofilm revealed a synergistic enhancement effect of Cr2AlC and CeO2. The Cr2AlC@CeO2 reinforced fabric composites (Cr2AlC@CeO2/fabric composites) exhibited the best wear resistance due to the superior load-bearing capacity of Cr2AlC and the outstanding lubricating properties of CeO2.

Open Access Research Article Issue
Halloysite‒gold core‒shell nanosystem synergistically enhances thermal conductivity and mechanical properties to optimize the wear-resistance of a pheonlic-PBO/PTFE textile composite liner
Friction 2023, 11(12): 2238-2252
Published: 29 May 2023
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Polymer-textile liner composites have potential applications in aerospace applications for reducing the abrasion damage of moving parts during operation owing to their self-lubrication, light weight, and high loading capacity. Herein, Au nanoparticles (AuNPs) are successfully loaded into the lumen of halloysite nanotubes (HNTs) to construct an HNTs‒Au peasecod core‒shell nanosystem to optimize the wear resistance of phenolic resin-based poly(p-phenylene benzobisoxazole) (PBO)/polytetrafluoroethylene (PTFE) textile composites. Transmission electron microscope (TEM) characterization reveals that the AuNPs are well-dispersed inside the HNTs, with an average diameter of 6‒9 nm. The anti-wear performance of the HNTs and Au-reinforced PBO/PTFE composites is evaluated using a pin-on-disk friction tester at 100 MPa. Evidently, the addition of HNTs‒Au induces a 27.9% decrease in the wear rate of the composites. Possible anti-wear mechanisms are proposed based on the analyzed results of the worn surface morphology and the cross-section of the tribofilm obtained by focused ion beam transmission electron microscopy.

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