Mechanism on improved surface flashover performances in vacuum of epoxy resin using fluorocarbon plasma treatment

Chen, Sile; Cheng, T.C.; Chen, Zhaoquan; Zhang, Guanjun

doi:10.1049/hve2.12169

Cited by 28 publications

(20 citation statements)

References 26 publications

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“…The inhibition effect of TFO is probably related to the strong electronegativity of Fluorine atoms. When the paper is subjected to a DC electric field, electrons passing through the interface of the TFO and the aramid will be easily captured by CF 3 and CF 2 , resulting the formation of negative groups to scatter the subsequent electron beam, which may hinder the carrier transport and discharge process [29].…”

Section: Conductivity and Dielectric Propertiesmentioning

confidence: 99%

Effect of organophilic group of coupling agent on the electrical performance of Boron Nitride/meta‐aramid composite paper

et al. 2022

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Organophilic groups of coupling agents can be the key factor for the electrical performance of Boron Nitride (BN)/meta‐aramid composite paper. In this article, four types of triethoxy‐silane coupling agents with different organophilic groups, including mercapto‐propyl (MP), glycidylether‐propyl (GP), amino‐propyl (AP) and trideca‐fluoro‐octyl (TFO) were studied. The structural and electrical properties of modified papers were compared, and the molecular simulation was conducted to reveal the interface interaction of modified BN and aramid. The results show that AP, GP and MP follow the same mechanism, improving the electrical performance by modifying the interface stability and paper structure, and the ranks of improving effects are AP, MP and GP. While, TFO mainly relies on the fluorine components to implement the electrical reinforcement, which compensates for the shortcoming in the paper structure. By choosing TFO and filler content of 15 wt%, the optimal breakdown strength of the paper can be increased to 28.17 kV/mm, 1.8 times that of the paper doped with the hydroxylated BN.

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Section: Conductivity and Dielectric Propertiesmentioning

confidence: 99%

Effect of organophilic group of coupling agent on the electrical performance of Boron Nitride/meta‐aramid composite paper

et al. 2022

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“…Comparatively, multipactor suppression is the more direct, effective, and frequently used strategy, which is based on the design principle to reduce the secondary electron yield (SEY) of the insulators and reduce the number of electrons available for SEEA. The SEY reduction approaches, including bulk insulation modification (e.g., chemical grafting [24,25], doping of functional fillers [26,27]) and surface treatment (e.g., fluorination [28,29], composite coating [30][31][32][33], plasma treatment [34][35][36], and thin film deposition [37,38]) have shown the ability of multipactor suppression to some extent. Nevertheless, most of these methods are collectively cumbersome and have poor mechanical stability.…”

Section: Introductionmentioning

confidence: 99%

Design and 3D printing of porous cavity insulation structure for ultra‐high electrical withstanding capability

et al. 2023

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Vacuum‐dielectric interface is the most vulnerable part of vacuum insulation systems where surface electrical breakdown is prone to happen, hence severely restricts the development of advanced electro‐vacuum devices with large capacity and its miniaturisation. Generally, a direct and effective way to improve vacuum surface insulation is to alleviate the initiation and development of multipactor phenomena. Inspired by this approach, the authors report a 3D‐printed insulation structure designed with a millimetre‐scale surface cavity covered by periodic through‐pore array via stereolithography, exhibiting remarkable multipactor suppression and flashover threshold improvement, well outperforming the conventional flashover mitigation strategies. Experiments and simulations demonstrate that electrons in the multipactor region pass through‐pores and are unlikely to escape from the cavity, hence no longer participate in the above‐surface multipactor process, and eventually improve flashover threshold. The proposed approach provides new inspiration for the design of advanced insulators featuring ultra‐high electrical withstanding capability and brings up new insight into pertinent industrial applications.

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“…As an emerging technology, plasma has received a lot of attention in the treatment of materials. Chen et al used He/CF 4 jet plasma fluorinated epoxy resin surface, and found through testing that the increase of roughness and grafting of fluorinated functional groups reduced the secondary electron emissivity and improved the material flashover performance [5] . Wang et al researched the effect of the deposition of silicon oxide (SiO x ) nanofilm on the surface of epoxy resin on its surface insulation properties.…”

Section: Introductionmentioning

confidence: 99%

Effects of plasma treatment on surface insulation properties of epoxy composites

He,

2023

J. Phys.: Conf. Ser.

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The surface of epoxy composite material working in DC electric field for a long time is easy to accumulate charge and cause flashover, which seriously reduces its insulation level and poses a threat to the safe operation of electrical equipment. In this study, SiO x films were deposited on the surface of nano-SiO2/ER nanoparticles by atmospheric pressure dielectric barrier discharge plasma vapor deposition technology using ethyl nor-silicate as a precursor. The effects of different deposition time on the deposition effect and the pressure level of the film surface were studied. Scanning electron microscope and atomic force microscope were used to characterize the surface morphology of the material, and the flashover voltage before and after deposition was measured. The results show that SiO x films of different thicknesses can be formed on the surface of the material at different times of plasma deposition. After extending the deposition time of the film, the film becomes more uniform and dense, the surface roughness of the material decreases continuously, and the electrical conductivity and flashover voltage along the surface increases continuously. After 10 min plasma treatment, the conductivity increased from 1.78×10−16 S to 2.3×10−13 S, while the flashover voltage along the surface increased from 19.29 kV to 22.66 kV, an increase of about 17.5%.

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Mechanism on improved surface flashover performances in vacuum of epoxy resin using fluorocarbon plasma treatment

Cited by 28 publications

References 26 publications

Effect of organophilic group of coupling agent on the electrical performance of Boron Nitride/meta‐aramid composite paper

Effect of organophilic group of coupling agent on the electrical performance of Boron Nitride/meta‐aramid composite paper

Design and 3D printing of porous cavity insulation structure for ultra‐high electrical withstanding capability

Effects of plasma treatment on surface insulation properties of epoxy composites

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