Effect of temperature on the tribological properties of Polytetrafluoroethylene/Kevlar fabric/phenolic composites

This study investigated the production, characterization, mechanical and tribological performance of surface‐modified cow bone powder‐reinforced composites. The primary goal was to increase the tribological and mechanical performance of sustainable and cleanly produced composite materials. It was determined that the surface‐modified bone powder reinforcement increased the mechanical, thermal, and wear resistance of the polymer. The best surface modification method was determined as silanization. It reduced the friction coefficient and weight loss by 16.60% and 40.0%, respectively, according to the main factor analysis. In addition, it increased the glass transition temperature by 45.54%, crystallization by 2.93%, hardness by 2.70%, and tensile strength by 9.26% compared to the unmodified bone powder reinforcement.Highlights Surface‐modified cow bone powder‐reinforced composites were produced and characterized. The tribological and mechanical performance of the composites was investigated comprehensively. Surface‐modified composites improved the wear resistance. Surface‐modified composites improved the thermal resistance and mechanical properties. The best surface modification method was found to be silanization.

Section: Methodsmentioning

confidence: 99%

Section: Surface Modification Processesmentioning

confidence: 99%

Investigation of the effect of surface modification types on the tribological performance of cow bone powder reinforced polymer materials

Kabave Kilincarslan,

Cetin,

Kanbur

et al. 2023

“…Polymer matrix composites have broad applications in trio‐materials, like gears, brakes, conveyor belts, etc., owing to their lightweight, easy processing, low cost, and good friction properties 1–4 . And engineering plastics, such as polyetheretherketone, polyphenylene sulfide as well as their fiber‐reinforced composites, are developed for serving under high load, high speed, and high temperature 5–8 .…”

Section: Introductionmentioning

confidence: 99%

Heterostructured rGO/MoS₂ to improve friction and wear performance of epoxy resins

Song,

Rong,

Feng

et al. 2023

In order to improve friction and wear performance of epoxy resins, the heterostructure of rGO/MoS2 was synthesized by homogeneously growing molybdenum disulfide on the surface of in‐situ reduced graphene oxide (rGO) via the hydrothermal method. The effect of additive type on the microstructure of rGO/MoS2 was discussed. And the obtained rGO/MoS2 exhibits uniform heterostructure with 100–200 nm flower‐like MoS2 nanoparticles scattering evenly on the surface of rGO when using PVP as the surfactant. Owing to robust hybrid structures and synergetic effects of rGO and MoS2, the friction interface temperature of rGO/MoS2/EP has dropped 37.2°C. And the average friction coefficient and specific wear rate of the composites with 0.60 wt% rGO/MoS2 are just 0.55 and 7.6 × 10−6 mm3 N−1 m−1, decreasing by 19.1% and 92.8% than those of epoxy resin.Highlights Flower‐like MoS2 particles scatter evenly on the surface of in‐situ reduced GO. MoS2 and rGO construct robust hybrid structure and form synergetic effects. The transfer film of hybrid rGO/MoS2 reduces interactions between two surfaces. The friction interface temperature of rGO/MoS2/EP drops 37.2°C. The μ and ws of 0.60 wt%rGO/MoS2/EP are reduced by 19.1% and 92.8%.

Enhancement of friction and wear performance of polytetrafluoroethylene composites through the synergistic effect of hard fillers

Yang,

Niu,

Wang

et al. 2024

The Stirling engine is a high‐efficiency externally heating piston engine. The self‐lubricating properties of polytetrafluoroethylene (PTFE) are crucial for the operation of Stirling engines. Three PTFE composites filled with different contents of carbon fiber (CF), polyimide (PI) and nano‐zirconia (nano‐ZrO2) were prepared and their mechanical, friction and wear properties were investigated. The results showed that the density of CF‐containing PTFE composites was significantly reduced by 1.46% to 6.9% compared to neat PTFE. Meanwhile, the incorporation of fillers greatly enhanced the hardness by more than 21.4% over the hardness of neat PTFE. In addition, the friction coefficients of three PTFE composites were lower than those of neat PTFE, and the wear rate of these composites was three orders of magnitude lower than that of neat PTFE. In particular, the wear rate of PTFE filled with CF and PI at high pressure (2 MPa) and high velocity (4 m/s) was only 1.24 × 10–6 mm3/Nm. The wear morphology was also analyzed by scanning electron microscopy and energy‐dispersive x‐ray spectroscopy. It was found that the addition of CF and PI in PTFE has the most pronounced improvement on tribological performances. The synergistic effect of CF's mechanical reinforcement and PI's adhesive properties reduces the wear of the matrix, resulting in excellent wear resistance of PTFE composites.Highlights The compressive strength of PTFE was reinforced by CF and nano‐ZrO2. CF can lower the density and significantly enhance hardness of PTFE. Synergistic CF and PI enhance PTFE composites' friction & wear performance. Adhesive fillers & debris size key to forming uniform continuous transfer films.