Surface flashover properties of epoxy based nanocomposites containing functionalized nano-TiO<sub>2</sub>

Yu, Shihu; Li, Shengtao; Wang, Shihang; Yin, Hang; Nazir, M. Tariq; Phung, B.T.

doi:10.1109/tdei.2018.007165

Cited by 49 publications

(8 citation statements)

References 40 publications

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“…In recent years, several surface modification methods, such as nanoparticle incorporation, electron beam irradiation, and surface coating, have been adopted to introduce deep traps into polymeric materials to improve surface flashover voltage. Yu et al [96] incorporated optimised filler content (~1 wt.%) of TiO 2 into epoxy resin and investigated DC surface flashover performances of epoxy nanocomposites in compressed gases and a vacuum. The results indicate the introduction of nanoparticles successfully increases the density of deep surface traps and the surface flashover voltage by 14%-23%.…”

Section: Effects Of Surface Traps On Surface Flashovermentioning

confidence: 99%

“…Yu et al. [96] incorporated optimised filler content (∼1 wt.%) of TiO 2 into epoxy resin and investigated DC surface flashover performances of epoxy nanocomposites in compressed gases and a vacuum. The results indicate the introduction of nanoparticles successfully increases the density of deep surface traps and the surface flashover voltage by 14%–23%.…”

Section: Competing Mechanisms Of Charge Transport In Surface Flashovermentioning

confidence: 99%

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Surface flashover in 50 years: Theoretical models and competing mechanisms

Liu

Ohki

et al. 2023

High Voltage

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Surface flashover is a devastating electronic avalanche along the gas–solid interface when a high electric field is applied, which is a potential issue that threatens the safe operations of advanced power electronic, electrical, and spacecraft applications. However, the underlying physical mechanisms for surface flashover development are still under investigation owing to the complex charge transport processes through the gas phase, solid phase, and gas–solid interface. In this study, the history of surface flashover theory in the last 50 years is introduced, and several key questions are reviewed from the perspective of the competing mechanisms of charge transport: the role of each phase in a surface flashover, the origin of surface charging, and effects of traps in solid on surface flashover. Then, some suggestions involve charge transport processes in each phase, and their correlations are put forward, and a predictable ‘charge transport competitive flashover model’ is proposed by clarifying the competing mechanisms of charge transport processes through multiple phases. This study summarises the history and hot topics of physical mechanisms of surface flashover proposed based on classic and recent progress and offers promising routes for developing a more precise surface flashover theory and improving surface flashover performances.

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Section: Effects Of Surface Traps On Surface Flashovermentioning

confidence: 99%

Section: Competing Mechanisms Of Charge Transport In Surface Flashovermentioning

confidence: 99%

Surface flashover in 50 years: Theoretical models and competing mechanisms

Liu

Ohki

et al. 2023

High Voltage

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“…In order to explore the flashover suppression mechanism of SrTiO 3 modification at the gas-solid interface in the 80-300 K temperature region, a physical model of surface flashover development considering the internal carrier transport characteristics of insulating materials was established [40][41][42], as shown in Figure 15. In the process of surface flashover, when the primary and secondary electrons collide with the surface of the insulating material, a certain amount of electrons and holes will appear on the surface of the insulating material due to the absorption of electrons or the emission of secondary electrons.…”

Section: Surface Discharge and Flashover Mechanismmentioning

confidence: 99%

Study on surface discharge of nonlinear conductive epoxy resin/SrTiO₃ composites in 80–300 K temperature zone

Xing,

Wang,

Wang

et al. 2023

High Voltage

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Bisphenol F epoxy resin (EP) is often used in terminal current lead insulation of superconducting equipment because of its good insulation performance, high mechanical strength, good toughness at cryogenic temperatures, and resistance to cold shock and heat shock. However, due to the wide temperature range of 80–300 K and the strong electric field, the EP‐N2 interface is prone to surface flashover, resulting in terminal insulation failure. To improve the reliability of the current lead insulation, non‐linear conductive EP/strontium titanate (SrTiO3) composites were prepared by modification with nano filling. The changes of dielectric, surface discharge, flashover, and trap distribution characteristics of composite materials were studied, and the mechanism of SrTiO3 on the surface flashover of composite materials was analysed. The results show that the conductivity of the composite increases with the rise of SrTiO3 filling content, and the amplitude of improvement is greater under the strong electric field, showing a more significant non‐linearity. The composite has a lower trap energy level and a greater number of shallow traps compared to pure EP, which accelerates surface charge de‐trapping and reduces charge accumulation, effectively enhancing the discharge and surface flashover voltage of the composite.

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“…Surface flashover is a major threat to epoxy-based insulation structures [10]. Accumulation of charges on the surface of insulating material, over a period, can lead to surface discharge inception leading to surface flashover at the operating voltage [11].…”

Section: Introductionmentioning

confidence: 99%

Investigation on space charge dynamics and mechanical properties of Epoxy Alumina nanocomposites

Neelmani

Suematsu

Sarathi

2020

Mater. Res. Express

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Epoxy nanocomposites with different wt% of alumina was prepared by use of high-speed shear mixer and high-frequency sonicator process, and the electrical and mechanical properties of the materials were investigated. Surface potential variation and trap distribution analysis were carried out with epoxy nanocomposites. Space charge analysis was carried out through Pulsed Electro Acoustic (PEA) technique. The dielectric constant and tan (δ) values of epoxy alumina nanocomposites were measured at different frequencies and temperatures. Contact angle and corona inception voltage caused by a water droplet showed a direct correlation. The viscoelastic properties of the epoxy nanocomposite material were examined through DMA studies. It was concluded that an increase in the supply frequency increases the storage modulus and loss modulus of the epoxy alumina nanocomposites. Glass transition temperature and activation energy increase with an increase in wt% of alumina content in epoxy resin. LIBS analysis indicates that the plasma temperature calculated increases with an increase in the wt% of alumina content in epoxy resin. Also, the measured plasma temperature and hardness of the material showed a direct correlation.

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Surface flashover properties of epoxy based nanocomposites containing functionalized nano-TiO₂

Cited by 49 publications

References 40 publications

Surface flashover in 50 years: Theoretical models and competing mechanisms

Surface flashover in 50 years: Theoretical models and competing mechanisms

Study on surface discharge of nonlinear conductive epoxy resin/SrTiO₃ composites in 80–300 K temperature zone

Investigation on space charge dynamics and mechanical properties of Epoxy Alumina nanocomposites

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Surface flashover properties of epoxy based nanocomposites containing functionalized nano-TiO2

Cited by 49 publications

References 40 publications

Surface flashover in 50 years: Theoretical models and competing mechanisms

Surface flashover in 50 years: Theoretical models and competing mechanisms

Study on surface discharge of nonlinear conductive epoxy resin/SrTiO3 composites in 80–300 K temperature zone

Investigation on space charge dynamics and mechanical properties of Epoxy Alumina nanocomposites

Contact Info

Product

Resources

About

Surface flashover properties of epoxy based nanocomposites containing functionalized nano-TiO₂

Study on surface discharge of nonlinear conductive epoxy resin/SrTiO₃ composites in 80–300 K temperature zone