Investigate on preparation and dry tribological behaviors of onion-like carbon/MoS2 polyimide coatings

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Applied Surface Science Pub Date : 2024-11-19 DOI:10.1016/j.apsusc.2024.161846

XingPeng Fei, Shusheng Liu, Ayush Subedi, Xinkai Ding, Enzhu Hu, Kunhong Hu

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Abstract

The development of biomass materials can effectively mitigate the scarcity of energy and minimize resource waste. In this work, onion-like biomass carbon nanoparticles (OLCs) were prepared using rice husk ash (RHA) which was subjected to a high-temperature graphitization reaction catalyzed by iron nitrate. OLCs/molybdenum disulfide (MoS₂) composite particles were prepared and incorporated into polyimide (PI), and a composite coating of OLCs/MoS₂/PI with excellent tribological properties was successfully prepared. The tribological properties of coatings were evaluated using a controlled atmosphere tribometer (WMT-2E) under dry friction conditions. The related friction and wear mechanism of PI coatings including particles was clarified by the SEM/EDS, XPS, HRTEM and DFT theory. Results show that the wear rate of the three composite coatings of polyimide with OLC, MoS₂, and OLC/MoS₂ particles were reduced by 52.9 %, 48.2 %, and 58.1 %, respectively. For the coefficient of friction, PI-0.20 OLC/MoS₂ coating material decreased by 16.1 %. Anti-wear and friction reduction mechanism is attributed to the presence of a transfer film on the surface of the steel balls. The addition of MoS₂ facilitated the deposition of nanoparticles, which further improved the stability and densification of the friction film, resulting in better protection of the metal surface against severe wear. Besides, the component structure changes of OLCs and MoS₂ and adsorption energy of friction products on the surface of tribo-pairs were also important reasons for clarifying the modification tribological behavior of PI coatings including three kinds of nanoparticles.

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洋葱状碳/MoS2 聚酰亚胺涂层的制备和干摩擦学行为研究

开发生物质材料可有效缓解能源紧缺问题，并最大限度地减少资源浪费。本研究利用稻壳灰（RHA）在硝酸铁催化下进行高温石墨化反应，制备了洋葱状生物质碳纳米颗粒（OLCs）。制备了 OLCs/二硫化钼（MoS2）复合颗粒，并将其与聚酰亚胺（PI）结合，成功制备了具有优异摩擦学性能的 OLCs/MoS2/PI 复合涂层。在干摩擦条件下，使用可控气氛摩擦仪（WMT-2E）对涂层的摩擦学性能进行了评估。通过 SEM/EDS、XPS、HRTEM 和 DFT 理论阐明了包括颗粒在内的 PI 涂层的相关摩擦和磨损机理。结果表明，聚酰亚胺与 OLC、MoS2 和 OLC/MoS2 颗粒的三种复合涂层的磨损率分别降低了 52.9%、48.2% 和 58.1%。在摩擦系数方面，PI-0.20 OLC/MoS2 涂层材料降低了 16.1%。抗磨和摩擦降低机理归因于钢球表面存在一层转移膜。MoS2 的加入促进了纳米颗粒的沉积，进一步提高了摩擦膜的稳定性和致密性，从而更好地保护金属表面免受严重磨损。此外，OLCs 和 MoS2 的组分结构变化以及摩擦产物在三元对表面的吸附能也是阐明包含三种纳米粒子的 PI 涂层的摩擦学改性行为的重要原因。

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来源期刊

Applied Surface Science 工程技术-材料科学：膜

CiteScore

12.50

自引率

7.50%

发文量

3393

审稿时长

67 days

期刊介绍： Applied Surface Science covers topics contributing to a better understanding of surfaces, interfaces, nanostructures and their applications. The journal is concerned with scientific research on the atomic and molecular level of material properties determined with specific surface analytical techniques and/or computational methods, as well as the processing of such structures.