Glass-Fiber-Reinforced 3D h-BN Skeleton for Epoxy Resin Insulation: Increased Arc-Ablation Resistance and Mechanical Strength

Sima, Wenxia; Tang, Xinyu; Sun, Potao; Yin, Ze; Shi, Zhanying; Yang, Ming; Yuan, Tao

doi:10.1109/tdei.2023.3235657

Cited by 7 publications

(6 citation statements)

References 25 publications

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“…On the other hand, the interface between filler and polymer is also significant important for their electrical insulting property. In this regard, a classical multi‐core model 15 and modified model 63 have already presented. Based on the multi‐core model, the interface zone incorporate bonded layer, bound layer and loose layer.…”

Section: Resultsmentioning

confidence: 99%

“…Notably, the bond strength in the bonded layer has a remarkable influence on the structure and proportion of the loose layer. 15,63 This means that the covalent bond (amino on surface of BNNS and hydroxy from the DN reacting with epoxy groups) probably contribute a more compact interface in the intersection zone of bonded layer and loose layer, as shown in the Figure 7F. In addition, the loose layer is principally contributed from the affinity force.…”

Section: Dielectric Breakdown Characteristicsmentioning

confidence: 92%

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Boron nitride nanosheet @ quantum‐sized diamond nanocrystal complex/epoxy nanocomposites with enhancing thermal conductivity and sufficient dielectric breakdown strength

Wang,

Zhou,

Zhang

et al. 2023

Polymer Composites

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With the development of high‐voltage and high‐power devices in the direction of compactness, lightness and extreme working environments, the contradiction between thermal conductivity and dielectric breakdown strength is becoming more and more obvious. In this work, a novel boron nitride nanosheet with uniformly dispersed diamond nanocrystalline (abbreviated as BA@DN) was prepared via facile acidizing hydroxylation, in situ copolymerization self‐assembly of dopamine and blending process. The obtained hybrid filler was employed to embed into epoxy matrix, showing enhanced thermal conductivity and sufficient dielectric breakdown strength. For example, the through‐plane and in‐plane thermal conductivity of epoxy composite with 5% BA@DN‐2 reaches to 0.56 and 3.824 W/m K, respectively. The study proposes a modified plane thermal conductivity model. Based on calculations, it was found that the modified thermal conductivity of 5% BA@DN‐2 is 3.47 W/m K, which is significantly higher than that of pure EP, specifically 17.35 times higher. These findings are significant in terms of materials science. while its alternating current and direct current dielectric breakdown strength are 48.84 and 136.31 kV/mm, about 85.68% and 99.1% of pure epoxy, respectively. The mechanism of outstanding dielectric breakdown strength was analyzed via dielectric characteristic, partial discharge performance and the theory of quantum size effect. In addition, a modified multi‐core model with a multilevel overlapping interface is presented.Highlights The acidified diamond nanocrystals (DNs) were attached to dopamine‐coated boron nitride nanocrystals by a blending process. The small size effect of DNs allows the epoxy film to have both high thermal conductivity and high insulation properties. A thermal conductivity correction model is proposed to eliminate the effect of graphite layer on the film.

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Section: Resultsmentioning

confidence: 99%

Section: Dielectric Breakdown Characteristicsmentioning

confidence: 92%

Boron nitride nanosheet @ quantum‐sized diamond nanocrystal complex/epoxy nanocomposites with enhancing thermal conductivity and sufficient dielectric breakdown strength

Wang,

Zhou,

Zhang

et al. 2023

Polymer Composites

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“…Epoxy resins (EP) is one of the solid polymer materials with excellent electrical, thermal, and mechanical properties, and are commonly used as insulating materials [1,2]. EP is sometimes used as an insulating varnish for windings in electrical equipment, such as motors for automotive use due to its excellent impregnation properties [3].…”

Section: Introductionmentioning

confidence: 99%

Electrical Properties of Alicyclic Epoxy Resins for Application to Varnish of Rotating Machine Winding

Ikenomata,

Kawashima,

Hozumi

et al. 2023

IEEJ Transactions Elec Engng

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Epoxy resins (EP) are commonly used to power apparatus due to their excellent electrical, thermal, and mechanical properties. Two types of EP resins were prepared to develop the varnishes for a rotating machine winding. A bifunctional alicyclic EP were used as an EP main resin, and an acid anhydride [mixture of hexahydro phthalic anhydride and methyl hexahydro phthalic anhydride (HHPA), or methyl nadic anhydride (NMA)] were used as a curing agent. The DC and impulse breakdown strengths of the EP‐HHPA were higher than that of EP‐NMA regardless of the applied voltage waveform and the temperature. The PDIV of the twisted pair sample coated with EP‐HHPA under the surge voltage application was also higher than that of twisted pair sample without the coating with EP resin and that with EP‐NMA. Furthermore, the transferred and/or accumulated charge amount of the EP‐HHAP on bulk and surface properties at high temperatures were superior to that of EP‐NMA. From these results, it is considered that EP‐HHPA may be preferable varnishes materials than EP‐NMA for a rotating machine winding. © 2023 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.

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“…The accumulation of microdamage can have disastrous consequences, such as insulation failure and mechanical structural failure in equipment. [5][6][7][8][9] Therefore, eliminating the safety hazards caused by microdamage in EP is important for ensuring the insulation safety of power energy networks and semiconductor devices. [10][11][12] Developing self-healing insulation materials is an effective means to solve this problem and is currently the focus of much research.…”

Section: Introductionmentioning

confidence: 99%

“…The accumulation of microdamage can have disastrous consequences, such as insulation failure and mechanical structural failure in equipment. 5–9 Therefore, eliminating the safety hazards caused by microdamage in EP is important for ensuring the insulation safety of power energy networks and semiconductor devices. 10–12…”

Section: Introductionmentioning

confidence: 99%

A UV-responsive mechanically robust insulating polymer that achieves intrinsic self-healing of electrical tree damage based on reversible anthracene photodimerization

Sun,

Shi,

Sima

et al. 2023

J. Mater. Chem. C

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Glass-Fiber-Reinforced 3D h-BN Skeleton for Epoxy Resin Insulation: Increased Arc-Ablation Resistance and Mechanical Strength

Cited by 7 publications

References 25 publications

Boron nitride nanosheet @ quantum‐sized diamond nanocrystal complex/epoxy nanocomposites with enhancing thermal conductivity and sufficient dielectric breakdown strength

Boron nitride nanosheet @ quantum‐sized diamond nanocrystal complex/epoxy nanocomposites with enhancing thermal conductivity and sufficient dielectric breakdown strength

Electrical Properties of Alicyclic Epoxy Resins for Application to Varnish of Rotating Machine Winding

A UV-responsive mechanically robust insulating polymer that achieves intrinsic self-healing of electrical tree damage based on reversible anthracene photodimerization

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