In-situ research on formation mechanisms of transfer films of a Polyimide-MoS2 composite in vacuum

Hu, Hanjun; He, Ying; Wang, Qihua; Tao, Liming

doi:10.1016/j.triboint.2022.108211

Cited by 11 publications

(4 citation statements)

References 65 publications

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“…The wear resistance and load‐bearing properties of double‐doped N,S@CDs are superior to those of single‐doped CDs‐NH 2 due to this crucial factor. In Figure S13 (Supporting Information) the O 1s fine spectrum exhibits two fitting peaks, namely C─O at ≈532.6 eV [ 41 ] and metal oxides at ≈530.3 eV, respectively. By combining with the Cu LMM spectrum, it can be inferred that the dominant species are CuO and Cu 2 O, [ 42 ] while C─O corresponds to the organic component in the amorphous carbon layer which gradually diminishes as etching depth increases, ultimately leaving only metal oxide signals.…”

Section: Resultsmentioning

confidence: 99%

Carbon Dots with Spatially‐Mediated‐N/S‐Co‐Doping Enabling One‐Year Stable Lubricant with Oil Leakage Detection Capability

Xue,

Cui,

Jin

et al. 2024

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The dispersion stability of nano‐lubricating additives is crucial for the shelf life of lubricant and its practical applications. Nitrogen–sulfur co‐doped carbon dots (N,S@CDs) via a one‐step hydrothermal method with nitropyrene and thiourea as raw materials are hereby presented. The N and S elements are selectively distributed throughout the entire carbon skeleton with a doping amount of 22.6 at%. The as‐synthesized N,S@CDs exhibit excellent dispersion stability in PEG200 and maintain stability for over one year. The experiment results indicate that N,S@CDs significantly improve the anti‐wear and friction reduction properties of PEG200, while the friction coefficient is reduced from 0.25 to 0.09 with 1.5 wt% N,S@CDs addition, and the wear volume, depth, and width are reduced by 68%, 52%, and 57%, respectively. The good lubrication performance is attributed to N,S@CDs excellent dispersion stability, enhanced filling and polishing effects, and complex tribochemical reactions caused by heteroatom doping to form a stable protective film on the worn surface. Furthermore, the as‐prepared N,S@CDs exhibit intrinsic fluorescence intensity in PEG200 with the photoluminescence quantum yield (PLQY) of 12.5% and remain fluorescent stable during the long‐term friction process, therefore the N,S@CDs have a potential application prospect in non‐destructive detection of oil leakage via fluorescence labeling method.

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Section: Resultsmentioning

confidence: 99%

Carbon Dots with Spatially‐Mediated‐N/S‐Co‐Doping Enabling One‐Year Stable Lubricant with Oil Leakage Detection Capability

Xue,

Cui,

Jin

et al. 2024

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“…This interlaminar sliding has a significant impact on the properties of PI-based composite materials. By adding MoS 2 , the wear resistance of the composite material can be effectively improved and the friction coefficient can be reduced (Hu et al , 2023). In addition, PI-MoS 2 composites exhibit good dimensional stability and low friction coefficient (Kumar et al , 2020), making them more suitable for manufacturing components with special requirements such as small size, long lifespan, low power consumption, high load-bearing capacity and high operational precision (Dahiwal et al , 2019).…”

Section: Progress In Tribological Research Of Polyimide Compositesmentioning

confidence: 99%

“…According to the reports, the incorporation of nanographite (NG) into PI via hot pressing has led to significant improvement in the tribological performance of NG/PI composites compared to pure PI (Wan et al , 2022). Another advantage of using hot pressing to prepare PI composites is that the various requirements for fillers are relatively low and composites with various fillers can be prepared, such as quartz fiber/PI composite materials (Chen et al , 2022) and MoS 2 /PI composite materials (Hu et al , 2023). Thus, the hot-pressing method finds broad applications in diverse scientific and technological domains.…”

Section: Preparation Of Polyimide and Its Compositesmentioning

confidence: 99%

Review of tribological properties of polyimide-based composite materials

Yan

Zhang

Wang

2023

ILT

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Purpose As a high-performance engineering plastic, polyimide (PI) is widely used in the aerospace, electronics and automotive industries. This paper aims to review the latest progress in the tribological properties of PI-based composites, especially the effects of nanofiller selection, composite structure design and material modification on the tribological and mechanical properties of PI-matrix composites. Design/methodology/approach The preparation technology of PI and its composites is introduced and the effects of carbon nanotubes (CNTs), carbon fibers (CFs), graphene and its derivatives on the mechanical and tribological properties of PI-based composites are discussed. The effects of different nanofillers on tensile strength, tensile modulus, coefficient of friction and wear rate of PI-based composites are compared. Findings CNTs can serve as the strengthening and lubricating phase of PI, whereas CFs can significantly enhance the mechanical properties of the matrix. Two-dimensional graphene and its derivatives have a high modulus of elasticity and self-lubricating properties, making them ideal nanofillers to improve the lubrication performance of PI. In addition, copolymerization can improve the fracture toughness and impact resistance of PI, thereby enhancing its mechanical properties. Originality/value The mechanical and tribological properties of PI matrix composites vary depending on the nanofiller. Compared with nanofibers and nanoparticles, layered reinforcements can better improve the friction properties of PI composites. The synergistic effect of different composite fillers will become an important research system in the field of tribology in the future.

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“…[28] Although PI is a high-performance engineering plastic with excellent creep resistance, its COF is over 0.20. [29][30][31][32] Polyphenylene sulfide (PPS) has excellent corrosion resistance and radiation resistance with inherent brittleness and low impact strength. [33][34][35][36] PU has unique hard and soft segments to obtain excellent flexibility, and corrosion resistance, which also provide a low COF and wear rate.…”

Section: Introductionmentioning

confidence: 99%

A review of solid lubrication based on polyurethane composites

et al. 2023

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Solid lubricant materials could be used in various extreme conditions owing to the excellent anti‐friction and ‐wear with the low friction coefficient and wear rate. Polyurethane (PU)‐based solid lubricants as one of the widely utilized composite materials had been well‐known by researchers all over the world. PU‐based composite lubricants were commonly segmented into single‐phase lubricants and multi‐phase lubricants via inorganic or organic lubricant additives. What is more, the modified PU by solid lubricants would endow higher tribological performances than that of single‐phase PU‐based lubricants. Based on the multi‐component synergy, the multi‐phase lubricants could significantly improve the PU matrix's lubrication and wear resistance and enhance the comprehensive performance such as corrosion resistance. This paper mainly discussed and summarized the recent development in tribological performances of PU‐based composite lubricants, and explored their prospective research directions.

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In-situ research on formation mechanisms of transfer films of a Polyimide-MoS2 composite in vacuum

Cited by 11 publications

References 65 publications

Carbon Dots with Spatially‐Mediated‐N/S‐Co‐Doping Enabling One‐Year Stable Lubricant with Oil Leakage Detection Capability

Carbon Dots with Spatially‐Mediated‐N/S‐Co‐Doping Enabling One‐Year Stable Lubricant with Oil Leakage Detection Capability

Review of tribological properties of polyimide-based composite materials

A review of solid lubrication based on polyurethane composites

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