Evolution of the low-temperature tribological performance of polychlorotrifluoroethylene and polyimide

Chen, Shengshan; Guo, Fei; Cheng, Ganlin; Xiang, Chong; Wang, Yuming

doi:10.1016/j.triboint.2023.108271

Cited by 8 publications

(5 citation statements)

References 22 publications

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“…The friction coefficient of PF at room temperature, similarly to which of PFMS, is relatively lower than the current reports 14,23,51 due to the slow velocity. 34 But it increased rapidly as temperature cooled down, ending up to 0.24 at 123 K. Calculably, the friction coefficient of PFMS is reduced by 58% at 123 K compared to conventional fabric composite without resin removal.…”

Section: Friction Coefficientmentioning

confidence: 98%

“…29,32,33 However, at cryogenic temperatures, the friction coefficient μ may decrease or increase. 29,34 The former and latter changes are contributed to decreasing μ d induced by increased Young's modulus 33 and increasing μ a caused by thermal activation 35,36 respectively. Therein, μ d , deformation component of μ, is affected by metal rough surface penetration and polymer plow, and μ a , adhesion component of μ, is affected by interfacial shear strength and actual contact area.…”

Section: Introductionmentioning

confidence: 99%

“…Such as the materials including one or more of PTFE, polyetheretherketone (PEEK), polyimide (PI), and carbon fibers (CF), their wear resistance would increase due to the enhanced harness and other mechanical properties 29,32,33 . However, at cryogenic temperatures, the friction coefficient

μ

may decrease or increase 29,34 . The former and latter changes are contributed to decreasing

μ_{d}

induced by increased Young's modulus 33 and increasing

μ_{a}

caused by thermal activation 35,36 respectively.…”

Section: Introductionmentioning

confidence: 99%

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Lubricating performance of polytetrafluoroethylene hybrid fabric composites with removed thermosetting resin at cryogenic temperatures

Wang

2023

J of Applied Polymer Sci

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At cryogenic temperatures, the higher friction coefficient of conventional fabric composites severely inhibits the application of hybrid polytetrafluoroethylene (PTFE)/amide fabric composites in pivotal tribological pairs such as plain bearings operated at low temperatures. In order to improve the lubricating properties of fabric composites at cryogenic and wide temperature ranges, a novel hybrid PTFE/Nomex fabric composite is prepared by peeling off the facial phenolic formaldehyde resin through the Hot-Press Mechanical Stripping method, which is named Phenolic Formaldehyde Mechanical Stripping (PFMS). The friction coefficient of PFMS is 0.06 at 296 K, and can be as low as 0.1 at 123 K, reduced by up to 58% compared to conventional fabric composite without resin removal. Furthermore, the friction coefficient of PFMS first increases and then decreases as the temperature decreases, the turning point falls in the range around the temperature of 181 K, corresponding to the γ relaxation transition of the PTFE. The wear of the fabric composites, the microstructure, and the chemical composition of the transfer film are comprehensively investigated. The results demonstrate that thermal activation and increased mechanical properties contribute to friction coefficient variation above and below the temperature of 181 K, respectively.

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Section: Friction Coefficientmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

μ

may decrease or increase 29,34 . The former and latter changes are contributed to decreasing

μ_{d}

induced by increased Young's modulus 33 and increasing

μ_{a}

caused by thermal activation 35,36 respectively.…”

Section: Introductionmentioning

confidence: 99%

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Lubricating performance of polytetrafluoroethylene hybrid fabric composites with removed thermosetting resin at cryogenic temperatures

Wang

2023

J of Applied Polymer Sci

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“…Polyimide (PI) is a high-performance polymer matrix that has been developed since 1950s, and it has excellent low-temperature resistance [ 1 ], high-temperature resistance [ 2 ], radiation resistance [ 3 ], and excellent self-lubricating properties [ 4 ]; as a result, it is widely used in the aerospace industry [ 5 ], triboelectric nanogenerators [ 6 ], and radiation-shielding materials [ 7 ]. However, the coefficient of friction and wear rate of pure PI are relatively high, which limits its application in extreme environments [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

Tribological Properties of Polyimide Composites Modified with Diamondoid Metal–Organic Frameworks

Yu,

Pei,

Pei

et al. 2024

Polymers

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In this work, diamondoid metal-organic frameworks (MOFs) were efficiently prepared by sonochemical synthesis and grown on polyimide (PI), aiming to improve the anti-wear performance of the PI matrix. By introducing MOFs into the PI matrix, the free movement of PI molecular chains were restricted, and its hardness and elastic modulus were improved. It was found that the wear rate of the 3 wt.% MOFs/PI composites was reduced by 72.6% compared to pure PI at a load of 4 N after tribological testing by using a ball-on-disk tribometer. This can be attributed to the excellent load-bearing and shear resistance of the fourfold-interpenetrated diamondoid networks, in which the transition metal elements can favor the formation of transfer films. It is worth noting that the 3 wt.% MOFs/PI composites still exhibited great tribological properties under high loads or high speeds. The findings of the present study indicate that diamondoid metal-organic frameworks can be used as efficient modifiers to enhance the tribological properties of PI.

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“…It was found that sealing composites based on fluoroplastic had lower friction coefficients and less leakage during testing. In [10], the tribological properties of fluoroplastic material under cryogenic conditions were studied. The suitability of the material for use in valves at low temperatures has been established.…”

Section: Introductionmentioning

confidence: 99%

Enhancing the tribological properties of fluoroplastics operating in a hydraulic fluid environment

Alisin,

Roshchin,

Lukyanov

2023

E3S Web of Conf.

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The issues of an increasing the wear resistance of fluoroplastics under conditions of dry friction against steel and in the environment of hydraulic fluids are discussed in this article. The statement about the prospects of radiation treatment for strengthening fluoroplastics is substantiated. Comparative tribological tests were carried out on a laboratory friction machine according to the friction scheme of the end of a cylindrical sample made of steel 40X13 on a fluoroplastic plate. It has been established that radiation-modified fluoroplastic has increased wear resistance. The antifriction properties of strengthened fluoroplastic during friction in a hydraulic fluid environment are investigated. The influence of load and speed on the friction coefficient is analyzed. Based on the study, a radiation modification of fluoroplastic rod seals of hydraulic cylinders and hydraulic piston machines is proposed, with a possible increase in wear resistance up to 4 times.

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Evolution of the low-temperature tribological performance of polychlorotrifluoroethylene and polyimide

Cited by 8 publications

References 22 publications

Lubricating performance of polytetrafluoroethylene hybrid fabric composites with removed thermosetting resin at cryogenic temperatures

Lubricating performance of polytetrafluoroethylene hybrid fabric composites with removed thermosetting resin at cryogenic temperatures

Tribological Properties of Polyimide Composites Modified with Diamondoid Metal–Organic Frameworks

Enhancing the tribological properties of fluoroplastics operating in a hydraulic fluid environment

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