Understanding of DC surface flashover performances of epoxy composites via DBD plasma treatment using Ar, air, CF4

IF 6.9 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Applied Surface Science Pub Date : 2025-10-18 DOI:10.1016/j.apsusc.2025.164923

Heng Zhang, Bo Zhu, Shujie Wu, Chixuan Fei, Junren Liang, He Gao, Minghe Chi, Zhen Li, Jialiang Huang, Jiu Liu, Zhi Fang

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Abstract

Flashover is a phenomenon involving damaging discharges on surfaces that limits the development of advanced electrical applications. Owing to being efficient, convenient, and stable, surface plasma treatment exhibits great potential in improving flashover performance; however, the effects of discharge gas on flashover are not clarified. Here, dielectric barrier discharge plasma in CF₄, air, and argon is applied to treat epoxy composites, and the epoxy chain reaction is analyzed by surface structural analysis. Then, the surface charge transport and flashover characteristics are measured. Through analysis from the molecular scale to macroscopic flashover, the effects of discharge gas on flashover are clarified. For Ar, chains are cut off by high-energy plasma and crosslink; the crosslinking structure introduces deep traps and impedes charge injection, thereby improving flashover by 10.5 %. For Air and plasma fluorination (PF), the cutoff chains react with strong electronegative O and F atoms, causing backbone degradation. The degradation of epoxy chains introduces shallow traps, accelerating charge dissipation and reducing surface charge, thereby enhancing flashover voltage by 13.0 % and 17.6 % for Air and PF. This work comprehensively illustrates the effects of discharge gas in plasma treatment on surface insulation properties of polymeric materials, being prone to advanced electrical applications toward lightweight and miniaturization.

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氩气、空气、CF4等离子体处理环氧复合材料直流表面闪络性能的研究

闪络是一种涉及表面破坏性放电的现象，它限制了先进电气应用的发展。表面等离子体处理具有高效、方便、稳定等优点，在改善闪络性能方面具有很大的潜力；然而，放电气体对闪络的影响尚不清楚。本文采用介质阻挡放电等离子体在CF4、空气和氩气中对环氧复合材料进行处理，并通过表面结构分析对环氧链式反应进行分析。然后，测量了表面电荷输运和闪络特性。通过从分子尺度到宏观的分析，阐明了放电气体对闪络的影响。对于Ar，链被高能等离子体和交联切断；交联结构引入了深阱，阻碍了电荷注入，从而使闪络性能提高了10. %。对于空气和血浆氟化（PF），切断链与强电负性的O和F原子反应，导致主链降解。环氧链的降解引入了浅陷阱，加速了电荷耗散，减少了表面电荷，从而使空气和PF的闪络电压分别提高了13.0 %和17.6 %。这项工作全面说明了等离子体处理中放电气体对聚合物材料表面绝缘性能的影响，有利于向轻量化和小型化的先进电气应用。

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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.