Tribological and Mechanical Behavior of Graphite Composites of Polytetrafluoroethylene (PTFE) Irradiated by the Electron Beam

Barylski, Adrian; Swinarew, Andrzej; Aniołek, Krzysztof; Kaptacz, Sławomir; Gabor, Jadwiga; Stanula, Arkadiusz; Waśkiewicz, Zbigniew; Knechtle, Beat

doi:10.3390/polym12081676

Cited by 13 publications

(3 citation statements)

References 30 publications

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“…After UV irradiation ( Figure 12 b), the surface of the sample was smoother, and the values of the average roughness Ra and the root mean square Rq of the sample showed a decreasing trend. This rule is consistent with the previous research results [ 32 , 33 , 34 ], indicating that the UV irradiation device described in this paper can effectively carry out the related research work on the influence of ground simulated space UV irradiation on the surface properties of materials.…”

Section: Resultssupporting

confidence: 92%

Development and Verification Experiment of In-Situ Friction Experiment Device for Simulating UV Irradiation in Space

Wei

Liu

Guo³

et al. 2022

Materials

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In order to explore the influence of space ultraviolet radiation on spacecraft lubricating materials, an in-situ friction experimental device simulating space ultraviolet radiation was developed in the laboratory, and the experimental verification was carried out. This paper firstly introduced the design index, structure and working principle of the space ultraviolet irradiation simulation device, and then calibrated and tested the parameters of the whole device, and also conducted a virtual operation of the device’s operation effect by simulation software, and the results showed that it met the design index. Finally, the validation tested of the ultraviolet irradiated in-situ friction experimental device were described in detail. By using the device to irradiate the samples, it was found that the in-situ ultraviolet irradiation device could achieve the expected irradiation effect, and the irradiation would lead to changes in the surface structure and properties of the PTFE material, while also achieving the need for in-situ spatial friction property testing of the material, providing favorable conditions for future testing.

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Section: Resultssupporting

confidence: 92%

Development and Verification Experiment of In-Situ Friction Experiment Device for Simulating UV Irradiation in Space

Wei

Liu

Guo³

et al. 2022

Materials

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“…Other researchers have also enhanced the mechanical properties of PTFE composites through irradiation modification. Barylski et al investigated the impact of 10 MeV electron beam irradiation at doses ranging from 26 to 156 kGy on PTFE with a graphite additive content of 15% and 20% 19 . Lv et al reported the utilization of proton irradiation for modifying CF‐reinforced PTFE composites 3 .…”

Section: Introductionmentioning

confidence: 99%

Effect of irradiation modification above melting point on the wear resistance of polytetrafluoroethylene

Bekbolatovich,

Wang,

Zheng

et al. 2024

J of Applied Polymer Sci

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The cross‐linked polytetrafluoroethylene (PTFE) and PTFE/carbon fiber (CF) composites were synthesized through electron beam irradiation in the molten state of PTFE at a controlled temperature of 340 ± 3°C under an inert gas atmosphere for this study. The wear resistance of raw (raw‐PTFE), irradiated modified PTFE (RM‐PTFE), and CF‐reinforced PTFE composites were evaluated using a friction and wear testing machine. The testing was conducted under varying ambient temperatures and dynamic loads. After irradiation, the samples were sectioned into specific sizes for subsequent testing purposes. Under the test conditions of 4.64 MPa positive pressure, 800 rpm speed, and a duration of 300 s at 20°C, the wear amount of PTFE after irradiation modification is significantly reduced from 1.4103 mm to only 0.0233 mm, representing a remarkable reduction by a factor of 60. Similarly, under the test conditions of 4.64 MPa positive pressure, 200 rpm speed, and a duration of 300 s at 20°C, the friction coefficient of PTFE after irradiation modification is substantially decreased from an initial value of 0.13 to just 0.03. The observed improvement can be attributed to the transformation of PTFE's crystalline form into spherulite, accompanied by a significant enhancement in the degree of cross‐linking within its molecular chain. The PTFE was supplemented with 10% CF prior to irradiation. Under the test conditions of a positive pressure of 4.64 MPa, rotation speed of 800 rpm, and a duration time of 300 s at 20°C, the wear amount of the composite material measured only 0.0007 mm, representing a reduction by a factor of 2000 compared to that observed for pure PTFE. This improvement can be attributed to the CF filler's high wear resistance properties and the composite's enhanced thermal conductivity.

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“…The addition of bronze affects the electrical conductivity and thermal volume. While the composites with coke content are produced to reduce flow under load, increase hardness and thermal conductivity [ 7 , 8 ]. In the work of Conte et.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Behavior and Morphological Study of Polytetrafluoroethylene (PTFE) Composites under Static and Cyclic Loading Condition

et al. 2021

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The key goal of this study was to characterize polytetrafluoroethylene (PTFE) based composites with the addition of bronze particles and mineral fibers/particles. The addition of individual fillers was as follows: bronze—30–60 wt.%, glass fibers—15–25 wt.%, coke flakes—25 wt.% and graphite particles—5 wt.%. Both static and dynamic tests were performed and the obtained results were compared with the microscopic structure of the obtained fractures. The research showed that the addition of 60 wt.% bronze and other mineral fillers improved the values obtained in the static compression test and in the case of composites with 25 wt.% glass fibers the increase was about 60%. Fatigue tests have been performed for the compression-compression load up to 100,000 cycles. All tested composites show a significant increase in the modulus as compared to the values obtained in the static compression test. The highest increase in the modulus in the dynamic test was obtained for composites with 25 wt.% of glass fibers (increase by 85%) and 25 wt.% of coke flakes (increase by 77%), while the lowest result was obtained for the lowest content of bronze particles (decrease by 8%). Dynamic tests have shown that composites with “semi-spherical” particles are characterized by the longest service life and a slower fatigue crack propagation rate than in the case of the long glass fibers. In addition, studies have shown that particles with smaller sizes and more spherical shape have a higher ability to dissipate mechanical energy, which allows their use in friction nodes. On the other hand, composites with glass fiber and graphite particles can be successfully used in applications requiring high stiffness with low amplitude vibrations.

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Tribological and Mechanical Behavior of Graphite Composites of Polytetrafluoroethylene (PTFE) Irradiated by the Electron Beam

Cited by 13 publications

References 30 publications

Development and Verification Experiment of In-Situ Friction Experiment Device for Simulating UV Irradiation in Space

Development and Verification Experiment of In-Situ Friction Experiment Device for Simulating UV Irradiation in Space

Effect of irradiation modification above melting point on the wear resistance of polytetrafluoroethylene

Mechanical Behavior and Morphological Study of Polytetrafluoroethylene (PTFE) Composites under Static and Cyclic Loading Condition

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