Effect of humidity and counterface material on the friction and wear of carbon fiber reinforced PTFE composites

Johansson, Pontus; Marklund, Pär; Björling, Marcus; Shi, Yijun

doi:10.1016/j.triboint.2021.106869

Cited by 50 publications

(26 citation statements)

References 19 publications

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“…Under the influence of frictional heat, the local temperature of the composites is higher than the overall temperature. Especially for polymers with low thermal conductivity, high temperatures may cause chemical reactions or material degradation on the surface, which further affects the friction properties of composites 36 …”

Section: Resultsmentioning

confidence: 99%

Effect of nano fillers on the properties of polytetrafluoroethylene composites: Experimental and theoretical simulations

Xiao

2021

J of Applied Polymer Sci

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Polytetrafluoroethylene (PTFE) has excellent corrosion resistance and a low coefficient of friction; however, its high wear rate and low hardness severely limit its use. In the work, nano particles were used as fillers for PTFE. The composites were prepared by the homogeneous mixing of PTFE and other fillers and sintered at high temperatures. The work aimed to investigate the effect of various nano fillers (nanocarbon powders, graphene, fullerene, nano graphite powders, and nano copper powders) on the mechanical, thermal, and frictional properties of composites. The results of the experiments showed that the addition of graphene could improve the stress and strain values of the composites, and all the nano fillers could improve the thermal conductivity of the PTFE composites. The friction experiments showed that fullerenes could significantly improve the wear resistance of PTFE composites. In the theoretical simulation, the thermal conductivity of PTFE composites was predicted using ANSYS software, with the changes in the temperature and friction force in the friction process. The theoretical simulation results matched with the experimental values, which proved the accuracy of the theoretical simulations.

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Section: Resultsmentioning

confidence: 99%

Effect of nano fillers on the properties of polytetrafluoroethylene composites: Experimental and theoretical simulations

Xiao

2021

J of Applied Polymer Sci

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“…Therefore, the near-contact temperature can only be controlled at elevated temperatures, where the minimum allowed temperature depends on the coefficient of friction and sliding velocity. For operating conditions used in the research paper [5] , i.e. a sliding velocity of 2.2 m/s and a near-contact temperature of 80 °C, sufficient cooling was achieved for all test conditions where steady-state coefficient of friction of up to 0.18 was noted.…”

Section: Description Of the Test Rigmentioning

confidence: 99%

“…3 . The temperatures were measured during tribotesting, where materials and operating conditions were similar to those described in the research paper [5] . The average friction torque for this test was calculated to 0.38 Nm which corresponds to a coefficient of friction of 0.05.…”

Section: Approximation Of Contact Temperaturementioning

confidence: 99%

“…Temperature conditions and average friction torque from tests against the 34CrNiMo6 counterface disc in the research paper [5] were used as inputs for the simulation shown in Figs. 2 and 3 .…”

Section: Approximation Of Contact Temperaturementioning

confidence: 99%

“…Many papers have proven the remarkable effect of sliding environment on friction and wear of various materials and lubricants, where the type of gas and humidity can greatly change the behaviour of friction and wear [1] , [2] , [3] , [4] . In particular, the authors, among a few other researchers, have shown that the trace moisture content in the environmental gas has a significant effect on friction and wear of polymers and polymer composites [5] , [6] , [7] , [8] .…”

Section: Introductionmentioning

confidence: 99%

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Precise control of operating conditions in tribotesting with respect to trace humidity and contact temperature

et al. 2021

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Research in tribology are often connected to tribosystems operating in specific environments, where climate chambers are needed for tribotesting to resemble the environmental conditions in the real application. Although the effect of humidity on the tribological performance of many materials and lubricants is evident, many studies are conducted without sufficient systems to accurately monitor and control the humidity level throughout testing. In this paper, a humidity controlling system was developed to enable continuous monitoring and precise control of the humidity at trace moisture levels. The climate controller was validated in a tri-pin-on-disc tribometer with excellent performance and can be fitted to most climate chambers. To further improve the control of operating conditions during tribotesting, a thermodynamic simulation of the contact temperature was developed. The developed climate controller is a simple and cost-effective method to accurately monitor and control the humidity in a climate chamber at trace moisture levels. The portable design of the humidity controller enables use with most climate chambers and enclosed tribometers. To have better control over the temperature in the sliding interface during testing, a thermodynamic simulation method was used to estimate contact temperature between sliding bodies from near-contact temperature measurements and the measured friction forces.

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Enhanced tribological properties of PEEK‐based composite coatings reinforced by PTFE and graphite

Liao

Cao

Wang

et al. 2021

J of Applied Polymer Sci

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The lubricating failure problems caused by friction and wear severely inhibit the regular operation and lifetime of artificial implanted joints. In order to improve their wear resistance effectively, the functional nano/micro-composite coatings consisted of poly(ether-ether-ketone) (PEEK)/graphite/polytetrafluoroethylene (PTFE) were successfully prepared through electrophoretic deposition and heat treatment. Additionally, the friction and wear behaviors under different loads and lubricating mediums of the composite coatings were investigated systematically. The results show that the composite coating significantly increased the microhardness and wear resistance of PEEK coating. The introduction of graphite and PTFE fillers reduces the wear rates and coefficient of friction (COF) of the composite coating significantly. Especially under 10 N load conditions, the friction and wear tests show that the composite coatings drop by 80% of friction coefficient and an order of magnitude in wear rates compared to that of PEEK coating. The improved wear resistance can be attributed to the synergistic effect of PTFE and graphite fillers. As a result, the graphite provides good load-bearing capacity and the PTFE lubricant endow a low friction coefficient for the composite coatings. Thus, this study provides a better approach to improve the wear resistance of PEEK-based coatings.

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Effect of humidity and counterface material on the friction and wear of carbon fiber reinforced PTFE composites

Cited by 50 publications

References 19 publications

Effect of nano fillers on the properties of polytetrafluoroethylene composites: Experimental and theoretical simulations

Effect of nano fillers on the properties of polytetrafluoroethylene composites: Experimental and theoretical simulations

Precise control of operating conditions in tribotesting with respect to trace humidity and contact temperature

Enhanced tribological properties of PEEK‐based composite coatings reinforced by PTFE and graphite

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