A long lifetime PTFE/aramid fiber composite liner modified by microcapsules under a high-frequency swing condition

Lu, Gaifen; Yang, Xiao; Qi, Xiaowen; Yan, Xiaocui; Dong, Yu; Yao, Weigang; Liu, Liang

doi:10.1016/j.triboint.2022.107624

Cited by 26 publications

(8 citation statements)

References 35 publications

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“…Furthermore, because the sliding surface is spherical, it can also make oblique movements around the X-axis and Z-axis in a certain angle range. Combined with the current research on the motion form of SSPBs [1,18], the tribometer should be able to realize the swing motion for SSPBs, and its loading direction should be along the radial direction. At present, the tribometer used for fabric SSPBs is well-developed.…”

Section: Requirement Definition and Overall Designmentioning

confidence: 99%

“…The test result showed that the wear zone is greatest in the middle of the self-lubricating materials. Beyond that, Lu et al [18] invented a high-frequency and light-load tribometer in an atmospheric environment and evaluated the service performance of the SSPBs. Liu et al [19] developed a high-temperature and heavy-load testing machine for SSPBs and obtained the tribological properties of SSPBs at 20 • C and 75 • C.…”

Section: Introductionmentioning

confidence: 99%

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Novel Tribometer for Coated Self-Lubricating Spherical Plain Bearings in a Vacuum

Zhang

Yong

et al. 2022

Lubricants

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Coated self-lubricating spherical plain bearings (SSPBs) are a fairly key component of the space-swing mechanism. To examine the operation status and tribological properties of coated SSPBs, a tribometer with a temperature control module in a vacuum condition was developed. The tribometer was mainly composed of a fixture system, reciprocating rotational motion system, environment control system, etc. First, the tribometer was verified with the self-made hydrogenated diamond-like carbon (H-DLC) SSPBs. The sensor signals indicated that the tribometer conformed to the design specifications. Then, the influence of friction heat on the tribological properties of H-DLC SSPBs was analyzed. The results showed that friction torque and temperature increased with the overall test time. Although the temperature had reached 48 °C, the frictional heat had little effect on the H-DLC SSPBs’ lifespans. The damage mechanism of H-DLC SSPBs was dominated by abrasive wear and fatigue wear in vacuum conditions.

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Section: Requirement Definition and Overall Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Novel Tribometer for Coated Self-Lubricating Spherical Plain Bearings in a Vacuum

Zhang

Yong

et al. 2022

Lubricants

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“…Self-lubricating spherical plain bearings are becoming more and more crucial in the field of heavy-duty machinery, especially for the development of marine ships and aerospace devices, due to their unique advantages of maintenance-free, needlessness of external lubrication, and low friction. − And embedding oil-containing microcapsules into polymer matrices is gradually becoming an appealing strategy to produce pivotal friction materials with high self-lubricating performance, because lubricating oil can be automatically released to provide lubrication in response to friction force changes without adding any extra oil into the contacting interface. − In general, fabricating various core–shell structures is an effective approach for storing more lubricating oil. Among them, polymer shells (like polysulfone), silica microcapsules, and carbon hollow nanospheres have been explored as oil containers used for the construction of self-lubricating materials and respectable examples have been proven to possess good performance.…”

Section: Introductionmentioning

confidence: 99%

Boosting UHMWPE Self-Lubricating Performance via Embedding Porous Cobalt-Based Zeolitic Imidazolate Framework Oil-Nanocontainers

Mo,

Cheng,

Chen

et al. 2024

ACS Appl. Eng. Mater.

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Zeolitic imidazolate frameworks (ZIFs) are ideal host materials in the adsorption and storage of lubricating oil due to their intrinsic features of high porosity, uniform pore size, and interconnected interior space, but they are much less exploited in oil-containing selflubricating areas. Herein, an ultrahigh surface area cobalt-based ZIF material (ZIF-67) with periodic microporous channels is synthesized successfully and introduced as an oil-nanocontainer embedding in the UHMWPE matrix. The constructed composites not only produce an ultralow steady-state coefficient of friction of ∼0.03 in dry sliding but also present a significant enhancement in antiwear properties, which decreases by over 60% wear rate compared to pure UHMWPE. Combined tribological performance and wear track morphologies reveal that the stored poly-alpha olefin 6 (PAO6) can be squeezed out sustainably and steadily from the pore channels of ZIF-67 under frictional stress and forming liquid lubricating films in the frictional contact area, thus resulting in such a remarkable self-lubricating performance improvement. This study proposes a new guideline for the design of microporous framework materials applied in oil-containing self-lubricating areas.

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“…However, there are few studies on improving tribological properties of PTFE/aramid fiber composite liners by microcapsules. Lu et al 25 and Yan et al 26 utilized PTFE/aramid fiber composite liners modified with PAO40/PSF and PAO40/SiO 2 microcapsules to validate their tribological performance under high‐frequency and heavy‐load conditions respectively. It was suggested that both PAO40/PSF and PAO40/SiO 2 microcapsules significantly decreased the COF and wear rate of such composite liners.…”

Section: Introductionmentioning

confidence: 99%

Effect of different microcapsule types on the wear mechanism of PTFE/aramid fiber composite liners

Yan,

Pang,

et al. 2023

Polymer Composites

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In this study, three different methods based on vacuum adsorption, solvent volatilization, and Pickering emulsion were utilized to prepare microcapsules with the core material of PAO40 and the wall materials of SiO2, polysulfone (PSF), and PSF/SiO2 composites, respectively. PTFE/Kevlar fabric liners were modified by PAO40/SiO2 microcapsules (PSMS), PAO40/PSF microcapsules (PPMS), and PAO40/PSF/SiO2 microcapsules (PPSMS). The effect of microcapsules based on different wall materials on the tribological properties of liners was investigated by friction and wear tester under low‐speed and heavy‐load conditions. The anti‐friction and anti‐wear mechanisms of several microcapsule types on the liners were systematically investigated. The results showed that PPMS induced the most significant enhancement in anti‐friction properties of liners when compared to pure liner resulting in a 19.4% reduction in coefficient of friction (COF). PSMS was found to reveal much better wear resistance of liners, as evidenced by 75% increase in wear rate. PSMS and PPSMS not only release lubricating oil after the break of microcapsules under the friction action to lubricate, but also generate a cavity to store abrasive debris for liner wear reduction. Nonetheless, PPMS only released the oil onto the friction surfaces for lubrication. PSF as the microcapsule wall material could not contribute to the formation and promote wear resistance of transfer films. SiO2 as a microcapsule wall material participates in the formation and enhances the wear resistance of transfer films. The findings obtained are anticipated to improve the reliability and broaden the range of applications of liners in aerospace and other industrial fields.Highlights Three microcapsules all improve the tribological properties of the liners. Anti‐friction and wear‐resisting mechanism of three microcapsules in liners. SiO2 as wall material can increase the wear resistance of transfer films. PAO40 in microcapsules has antifriction effect at the friction interface.

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A long lifetime PTFE/aramid fiber composite liner modified by microcapsules under a high-frequency swing condition

Cited by 26 publications

References 35 publications

Novel Tribometer for Coated Self-Lubricating Spherical Plain Bearings in a Vacuum

Novel Tribometer for Coated Self-Lubricating Spherical Plain Bearings in a Vacuum

Boosting UHMWPE Self-Lubricating Performance via Embedding Porous Cobalt-Based Zeolitic Imidazolate Framework Oil-Nanocontainers

Effect of different microcapsule types on the wear mechanism of PTFE/aramid fiber composite liners

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