Enhanced surface insulation of micron alumina/epoxy composites brought by plasma co‐hydrothermal fluorination of filler

Zhou, Huahao; Xie, Qing; Ruan, Haoou; An, Guoping; Wu, Gengteng; Yang, Xinyu; Zhang, Yahui

doi:10.1002/pc.25584

Cited by 11 publications

(8 citation statements)

References 43 publications

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“…If the charge breaks free of the trap, it can cause a large amount of energy release and induce flashover. Therefore, by studying the trap characteristics of composites, the mechanism of flashover voltage increase in EP composites can be explored [ 43 , 44 ].…”

Section: Resultsmentioning

confidence: 99%

Effect of Bismuth Ferrite Nanometer Filler Element Doping on the Surface Insulation Properties of Epoxy Resin Composites

et al. 2021

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In the direct current electric field, the surface of epoxy resin (EP) insulating material is prone to charge accumulation, which leads to electric field distortion and damages the overall insulation of the equipment. Nano-doping is an effective method to improve the surface insulation strength and DC flashover voltage of epoxy resin composites. In this study, pure bismuth ferrite nanoparticles (BFO), as well as BFO nanofillers, which were doped by La element, Cr element as well as co-doped by La + Cr element, were prepared by the sol-gel method. Epoxy composites with various filler concentrations were prepared by blending nano-fillers with epoxy resin. The morphology and crystal structure of the filler were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD) tests. The effects of different filler types and filler mass fraction on the surface flashover voltage, charge dissipation rate, and trap characteristics of epoxy resin composites were studied. The results showed that element doping with bismuth ferrite nanofillers could further increase the flash voltage of the composites. The flashover voltage of La + Cr elements co-doped composites with the filler mass fraction of 4 wt% was 45.2% higher than that of pure epoxy resin. Through data comparison, it is found that the surface charge dissipation rate is not the only determinant of the flashover voltage. Appropriately reducing the surface charge dissipation rate of epoxy resin composites can increase the flashover voltage. Finally, combining with the distribution characteristics of the traps on the surface of the materials to explain the mechanism, it is found that the doping of La element and Cr element can increase the energy level depth and density of the deep traps of the composite materials, which can effectively improve the flashover voltage along the surface of the epoxy resin.

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Section: Resultsmentioning

confidence: 99%

Effect of Bismuth Ferrite Nanometer Filler Element Doping on the Surface Insulation Properties of Epoxy Resin Composites

et al. 2021

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“…Since deep and shallow traps play a dominant role in different stages of charge dissipation. According to reference, [29][30] the surface structure of the dielectric is analyzed from the angle of deep and shallow traps, and the mechanism of flashover along the surface is explained.…”

Section: Effect Of Filler Morphology On Flashover Voltage Of Ep Commentioning

confidence: 99%

Effect of morphology and particle size of bismuth ferrite filler on the surface insulation of epoxy resin composites

et al. 2020

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The morphology and particle size of nanofillers have specific effects on their micro-distribution parameters in the polymer matrix and macro-properties of composites. In this study, bismuth ferrite nanoparticles (BFO) with different particle sizes were prepared by the sol-gel route, and bismuth ferrite nanofibers (fBFO) were synthesized by electrospinning method, then were blended with epoxy resin as a filler to prepare the epoxy composites with multiple filler concentrations. The morphology and crystal structure of the filler were characterized by SEM and XRD. The effect of filler morphology and particle size on the surface insulation of composites was studied. We found that fBFO nanofibers have better dispersion in epoxy matrix, and fBFO/EP composites have more excellent surface insulation properties. Meanwhile, as the particle size of the filler increases, the flashover voltages of the BFO/EP composites increase. Finally, the simulation model of electric field inside EP composites were established and the trap distribution was calculated by isothermal surface potential decay method. The influence mechanism of filler morphology and particle size on the surface insulation properties of EP composites was further analyzed. BFO particles and nanofibers as fillers blended with epoxy resin have a great engineering application potential.

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“…At the same time, the insulation material in the equipments work for a long time and the insulation performance could be weakened. [1,2,3] As a result, more attention has been paid to thermal management, which becomes a key issue in many fields. Therefore, the research into the preparation and performance of materials for electrical insulation with high thermal management capabilities is important.…”

Section: Introductionmentioning

confidence: 99%

Improved thermal and electrical properties of epoxy resin composites by dopamine and silane coupling agent modified hexagonal BN

et al. 2020

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The high thermal conductivity epoxy resin composites filled with inorganic filler can improve the low thermal conductivity of epoxy resin. However, a large number of fillers with high thermal conductivity will reduce other properties of the composites, which limits their use under high voltage, high temperature and strong mechanical force during operation. In this study, the dopamine-modified BN (DBN) and k-DBN (DBN modified by coupling agent KH-560) were prepared by employed the dopamine with catechol groups and coupling agent to modify boron nitride. The thermal conductivity, thermal stability, and dielectric properties of composites with different contents of modified fillers were studied. The results showed that surface modification improved the dispersibility of BN in the resin matrix and compatibility with the resin. Among BN/EP, DBN/EP, k-DBN/EP composites, k-DBN/EP composites had the highest thermal conductivity at the same number of additions. When the k-DBN/EP content was 30 wt%, the thermal conductivity of the composite was 0.892 W/(mÁK), which was an increase of 25.5% compared with the BN/EP composite. The appropriate amount of BN filling (20 wt%) can improve the breakdown strength of the composite material.

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Enhanced surface insulation of micron alumina/epoxy composites brought by plasma co‐hydrothermal fluorination of filler

Cited by 11 publications

References 43 publications

Effect of Bismuth Ferrite Nanometer Filler Element Doping on the Surface Insulation Properties of Epoxy Resin Composites

Effect of Bismuth Ferrite Nanometer Filler Element Doping on the Surface Insulation Properties of Epoxy Resin Composites

Effect of morphology and particle size of bismuth ferrite filler on the surface insulation of epoxy resin composites

Improved thermal and electrical properties of epoxy resin composites by dopamine and silane coupling agent modified hexagonal BN

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