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Tailoring interfacial crosslinking sites to improve the dielectric properties of epoxy/POSS nanocomposites SCIE Scopus
期刊论文 | 2023 | JOURNAL OF MATERIALS SCIENCE
SCOPUS Cited Count: 2
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Abstract :

Interfacial characteristics are critical to the insulation performance of dielectric nanocomposites (NCs). However, the impact of physicochemical properties on interfacial characteristics and resultant dielectric properties is still unclear. In this study, the interfacial characteristics of epoxy resin/polyhedral-oligomeric-silsesquioxane (EP/POSS) are tailored by POSS functional groups, including octa-glycidyl (OG) and epoxycyclohexyl (ECH), to improve the dielectric performance. The characterization and experimental results show that the EP/OG-POSS exhibits better interfacial compatibility and dielectric performance than the EP/ECH-POSS. The molecular dynamic simulation results show that compared with the EP/ECH-POSS, the better interfacial compatibility of the EP/OG-POSS is derived from the intrinsically stronger interfacial interaction between the OG-POSS and EP, which results in a higher interfacial crosslinking degree and a more compact interfacial structure. It further reduces the free volume and mean square displacement of molecular chains. Thus, besides the self-crosslinking of EP matrix, the incorporation of the OG-POSS introduces more interfacial crosslinking sites, which can also act as deep traps for charges. The more the interfacial crosslinking sites, the deeper the traps. These deep traps hinder the charge transport, ultimately improve the volume resistivity and maintain uniform space charge distribution. Therefore, an effective approach is proposed to improve the charge-trapping behavior and dielectric properties of NCs by tailoring interfacial crosslinking sites.

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GB/T 7714 Aslam, Farooq , Qu, Guanghao , Feng, Yang et al. Tailoring interfacial crosslinking sites to improve the dielectric properties of epoxy/POSS nanocomposites [J]. | JOURNAL OF MATERIALS SCIENCE , 2023 .
MLA Aslam, Farooq et al. "Tailoring interfacial crosslinking sites to improve the dielectric properties of epoxy/POSS nanocomposites" . | JOURNAL OF MATERIALS SCIENCE (2023) .
APA Aslam, Farooq , Qu, Guanghao , Feng, Yang , Li, Shengtao . Tailoring interfacial crosslinking sites to improve the dielectric properties of epoxy/POSS nanocomposites . | JOURNAL OF MATERIALS SCIENCE , 2023 .
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Surface Modification-Dominated Space-Charge Behaviors of LDPE Films: A Role of Charge Injection Barriers SCIE Scopus
期刊论文 | 2022 , 15 (17) | MATERIALS
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Abstract :

Gradually increasing power transmission voltage requires an improved high-voltage capability of polymeric insulating materials. Surface modification emerges as an easily accessible approach in enhancing breakdown and flashover performances due to the widely acknowledged modification of space-charge behaviors. However, as oxidation and fluorination essentially react within a limited depth of 2 mu m underneath polymer surfaces, the nature of such bulk space-charge modulation remains a controversial issue, and further investigation is needed to realize enhancement of insulating performance. In this work, the surface oxidation-dependent space-charge accumulation in LDPE film was found to be dominated by an electrode/polymer interfacial barrier, but not by the generation of bulk charge traps. Through quantitative investigation of space-charge distributions along with induced electric field distortion, the functions of surface oxidation on the interfacial barrier of a typical dielectric polymer, LDPE, is discussed and linked to space-charge behaviors. As the mechanism of surface modification on space-charge behaviors is herein proposed, space-charge accumulation can be effectively modified by selecting an appropriate surface modification method, which consequentially benefits breakdown and flashover performances of polymeric insulating films for high-voltage applications.

Keyword :

charge injection high voltage insulating polymer LDPE space charge surface oxidation

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GB/T 7714 Zhu, Yuanwei , Chen, Haopeng , Chen, Yu et al. Surface Modification-Dominated Space-Charge Behaviors of LDPE Films: A Role of Charge Injection Barriers [J]. | MATERIALS , 2022 , 15 (17) .
MLA Zhu, Yuanwei et al. "Surface Modification-Dominated Space-Charge Behaviors of LDPE Films: A Role of Charge Injection Barriers" . | MATERIALS 15 . 17 (2022) .
APA Zhu, Yuanwei , Chen, Haopeng , Chen, Yu , Qu, Guanghao , Lu, Guanghao , Min, Daomin et al. Surface Modification-Dominated Space-Charge Behaviors of LDPE Films: A Role of Charge Injection Barriers . | MATERIALS , 2022 , 15 (17) .
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Radiation electron trajectory modulated DC surface flashover of polyimide in vacuum EI SCIE Scopus
期刊论文 | 2022 , 55 (20) | JOURNAL OF PHYSICS D-APPLIED PHYSICS
SCOPUS Cited Count: 5
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Improving surface flashover voltage on vacuum-dielectric interface irradiated by electrons is a long-standing challenge for developing high-voltage and high-power spacecraft technology. The basic issue is understanding the role of radiation electrons in the process of surface flashover. In this paper, a 'three-segment' curve concerning the surface flashover properties under electron irradiation is discovered experimentally. As the gap distance of electrodes increase, the surface flashover voltage of polyimide during electron irradiation presents a trend of firstly increasing, then decreasing, and finally stabilizing. According to the simulation of the trajectory distribution for kinetic electrons, this trend is found to correspond with three typical stages respectively. In stage A, the kinetic electrons are completely deflected and the varying electrode parameters mainly affect the electric field distribution. In stage B, the kinetic electrons can irradiate the part of polyimide. The promoting effect of those electrons on flashover process enhance with the enlargement of the irradiated region. In stage C, trajectories are no longer seriously deflected and the role of kinetic electrons do not vary with electrode parameters. Combining with the results above, a model with combined effects of both kinetic and deposited electrons on surface flashover in vacuum is thus proposed, base on which the guidance for the methods of improving surface flashover voltage during electron irradiation is provided.

Keyword :

electron irradiation electron trajectory polyimide surface flashover

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GB/T 7714 Wang, Xiaoping , Zheng, Shusai , Li, Zhen et al. Radiation electron trajectory modulated DC surface flashover of polyimide in vacuum [J]. | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2022 , 55 (20) .
MLA Wang, Xiaoping et al. "Radiation electron trajectory modulated DC surface flashover of polyimide in vacuum" . | JOURNAL OF PHYSICS D-APPLIED PHYSICS 55 . 20 (2022) .
APA Wang, Xiaoping , Zheng, Shusai , Li, Zhen , Pan, Shaoming , Fan, Weibo , Min, Daomin et al. Radiation electron trajectory modulated DC surface flashover of polyimide in vacuum . | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2022 , 55 (20) .
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Investigation on the Correlation between Dispersion Characteristics at Terahertz Range and Dielectric Permittivity at Low Frequency of Epoxy Resin Nanocomposites SCIE Scopus
期刊论文 | 2022 , 14 (4) | POLYMERS
SCOPUS Cited Count: 4
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Abstract :

Despite the extensive research on nanocomposites, a fundamental theory on the interface region is still difficult to achieve. In the present paper, we chose epoxy resin and nano-SiO2, nano-SiC, nano-ZnO to prepare three kinds of nanocomposites. The dispersion characteristics at the terahertz range and dielectric permittivity at 1 Hz of epoxy resin-based nanocomposites were investigated. The reduction of the permittivity of nanocomposites at a slight filler concentration was absent at the terahertz range. The measurement results at 1 Hz show that the interaction between nano-SiO2, nano-SiC particles and epoxy resin was strong with the modification of the silane coupling agent. However, the modification of nano-ZnO particles was invalid. The Lorentz harmonic oscillator model was employed to fit the dispersion characteristics. The relevance between the damping constant and the dielectric permittivity at low frequency was established, indicating that the increase in the damping coefficient results from the restriction of the molecular chain motion by the interfacial region. The present results in this paper reveal a bright prospect of terahertz time-domain spectroscopy in establishing the theory of nanocomposite dielectric.

Keyword :

dispersion characteristics epoxy resin Lorentz oscillator model nanocomposites terahertz time-domain spectroscopy

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GB/T 7714 Lian, Ze , Chen, Danyang , Li, Shengtao . Investigation on the Correlation between Dispersion Characteristics at Terahertz Range and Dielectric Permittivity at Low Frequency of Epoxy Resin Nanocomposites [J]. | POLYMERS , 2022 , 14 (4) .
MLA Lian, Ze et al. "Investigation on the Correlation between Dispersion Characteristics at Terahertz Range and Dielectric Permittivity at Low Frequency of Epoxy Resin Nanocomposites" . | POLYMERS 14 . 4 (2022) .
APA Lian, Ze , Chen, Danyang , Li, Shengtao . Investigation on the Correlation between Dispersion Characteristics at Terahertz Range and Dielectric Permittivity at Low Frequency of Epoxy Resin Nanocomposites . | POLYMERS , 2022 , 14 (4) .
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Kinetic and chemorheological evaluation on the crosslinking process of peroxide-initiated low-density polyethylene EI SCIE Scopus
期刊论文 | 2022 , 266 | POLYMER
SCOPUS Cited Count: 7
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Abstract :

Peroxide-initiated low-density polyethylene (PLPE) has been extensively used as insulating materials for high-voltage cables, while the lack of comprehensive knowledge on crosslinking process of PLPE seriously limits the development of cable insulation. Here, the crosslinking process and mechanism of PLPE are fully revealed by combining kinetic and chemorheological analysis for the first time. Rheological parameters during crosslinking process of PLPE are obtained by dynamic rheology experiments at different frequencies and temperatures. Crosslinking kinetics of PLPE is explored by rheological conversion method and diffusion-controlled Kamal-Sourour model. Meanwhile, chemorheological behaviors of PLPE are discussed based on percolation theory and Arrhenius law. The results indicate that the crosslinking reaction of PLPE involves complex n-order and auto-catalytic reactions. Importantly, the autocatalytic reaction and the gelation formation significantly enhance the reaction rate. Furthermore, physical diffusion of macromolecular chains obviously reduces the reaction rate and prolongs the termination reaction. Based on that, the mutual influences and relationships between the kinetic and chemorheological behaviors are established by combining the apparent activation energy. It is suggested that PLPE crosslinking process is controlled by alternant synergistic action of chemical reaction and physical diffusion. This work can provide a critical theoretical basis for the comprehension and optimization of PLPE crosslinking process.

Keyword :

Apparent activation energy Chemorheology Crosslinking process Kinetics Low-density polyethylene

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GB/T 7714 Li, Jiacai , Si, Zhicheng , Shang, Kai et al. Kinetic and chemorheological evaluation on the crosslinking process of peroxide-initiated low-density polyethylene [J]. | POLYMER , 2022 , 266 .
MLA Li, Jiacai et al. "Kinetic and chemorheological evaluation on the crosslinking process of peroxide-initiated low-density polyethylene" . | POLYMER 266 (2022) .
APA Li, Jiacai , Si, Zhicheng , Shang, Kai , Feng, Yang , Wang, Shihang , Li, Shengtao . Kinetic and chemorheological evaluation on the crosslinking process of peroxide-initiated low-density polyethylene . | POLYMER , 2022 , 266 .
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XLPE/h-BN Nanocomposites With Enhanced DC Insulation Properties EI SCIE Scopus
期刊论文 | 2022 , 29 (1) , 62-68 | IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
SCOPUS Cited Count: 12
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Abstract :

Nanocomposites have been developed as the third-generation insulating materials. This article introduces the crosslinked polyethylene (XLPE) nanocomposite dielectric doped with a small amount of nano-hexagonal boron nitride (h-BN), which exhibits excellent insulation properties under high dc voltage. The test results showthat XLPE/h-BN nanocomposites possess significant improvements in dc breakdown strength and 0.1 wt% nano h-BN doping can actually increase the dc breakdown strength by 39%. The space charge properties of the XLPE/h-BN obtained by the pulsed electro-acoustic (PEA) measurements and the direct current integrated charge [DCIC-Q(t)] measurements show that the positive homocharge injection under dc voltage is obviously suppressed, and the electrical conductivity under relatively high electric field decreases. The thermally stimulated current results show that the nano h-BN doping introduces only deep charge traps (above 1 eV) to the XLPE matrix. The trap energy is deeper than that of the original traps, and this is the main factor leading to the improvement of the dc insulation properties. Besides, the doping of h-BN does not introduce impurities or change the crystallinity of XLPE. This article presents the novel XLPE/h-BN nanocomposites with excellent dc insulation properties and indicates the large potential of the nano h-BN-doped insulation materials.

Keyword :

Charge injection crosslinked polyethylene (XLPE) dc breakdown hexagonal boron nitride (h-BN) nanocomposite

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GB/T 7714 Wang, Shihang , Li, Jianying , Li, Shengtao . XLPE/h-BN Nanocomposites With Enhanced DC Insulation Properties [J]. | IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION , 2022 , 29 (1) : 62-68 .
MLA Wang, Shihang et al. "XLPE/h-BN Nanocomposites With Enhanced DC Insulation Properties" . | IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION 29 . 1 (2022) : 62-68 .
APA Wang, Shihang , Li, Jianying , Li, Shengtao . XLPE/h-BN Nanocomposites With Enhanced DC Insulation Properties . | IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION , 2022 , 29 (1) , 62-68 .
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Effect of Deposited Charge on Vacuum DC Surface Flashover Under Electron Beam Irradiation EI SCIE Scopus
期刊论文 | 2022 , 50 (6) , 1934-1941 | IEEE TRANSACTIONS ON PLASMA SCIENCE
SCOPUS Cited Count: 7
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Abstract :

Spacecraft operating environment is rather complex, including high vacuum and energetic electron radiation. Vacuum-insulation interface is usually the weakest link of the insulation system since surface flashover usually occurs at the interface. There are several theories for surface flashover, above which the secondary electron emission avalanche (SEEA) and the electron triggered polarization relaxation (ETPR) are the mainstream. Since researchers have usually assumed that there has been a preexisting positive charge on the insulation surface, when the insulation surface is negatively charged by electron beam irradiation, these theories cannot be directly applied. In this article, the particle tracking method is used to simulate the initial and secondary electron trajectories in the initial phase of surface flashover, and to explain the influence of negative surface charge on surface flashover. The results show that: on the one hand, the negative deposited charge weakens the electric field at the cathode triple junction (CTJ), inhibits the initial electron emission, and hinders the initiation of flashover; on the other hand, the negative deposited charge repels the secondary electrons away from the insulation surface and hinders the multiplication of the secondary electrons and the development of flashover.

Keyword :

Deposited charge Dielectrics electron beam irradiation Electron beams Force Insulation Kinetic theory Surface treatment Trajectory vacuum dc surface flashover vacuum-insulation interface

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GB/T 7714 Pan, Shaoming , Wang, Xiaoping , Min, Daomin et al. Effect of Deposited Charge on Vacuum DC Surface Flashover Under Electron Beam Irradiation [J]. | IEEE TRANSACTIONS ON PLASMA SCIENCE , 2022 , 50 (6) : 1934-1941 .
MLA Pan, Shaoming et al. "Effect of Deposited Charge on Vacuum DC Surface Flashover Under Electron Beam Irradiation" . | IEEE TRANSACTIONS ON PLASMA SCIENCE 50 . 6 (2022) : 1934-1941 .
APA Pan, Shaoming , Wang, Xiaoping , Min, Daomin , Li, Dajian , Rao, Xiajin , Su, Yi et al. Effect of Deposited Charge on Vacuum DC Surface Flashover Under Electron Beam Irradiation . | IEEE TRANSACTIONS ON PLASMA SCIENCE , 2022 , 50 (6) , 1934-1941 .
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On-Line Fault Diagnosis for Structural Health of Wind Power Dedicated Busbar Trunking EI SCIE Scopus
期刊论文 | 2022 , 71 | IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
SCOPUS Cited Count: 1
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Abstract :

The key objective in structural health monitoring of wind power-dedicated busbar trunking (WPDBT) is to detect abnormal events in structural behavior by monitoring of severity of fixing bolt looseness in the linear connection unit of WPDBT. However, it is difficult to directly monitor the looseness of the fixing bolts online. The tightening torque of the fixing bolt directly reflects the looseness of the bolt. A novel quantitative indirect measurement method of tightening torque employing temperature rise, operation current, and structure and material parameters as direct measurement is proposed in this article. Based on the proposed physical model of the connection between the tightening torque, the temperature rise and the operation current of the linear connection unit, a magnetic-electric-thermal multiphysics coupling model of WPDBT is established. The bolt tightening torque can be directly calculated from the temperature rise and the operation current by the physical model presented in this article. To further demonstrate the accuracy of the method and achieve online monitoring of structural health, an online monitoring system for fault diagnosis of the linear connection unit of WPDBT is designed based on this physical model. The online monitoring system was applied to an experimental platform for WPDBT. The effectiveness of the method proposed in this article is further verified. It is proven that the temperature rise and operation current of the linear connection unit can indirectly measure the looseness of the fixing bolts. Finally, a method of structural health assessment for WPDBT is given. The new approach opens the way for real-time monitoring the structural health for WPDBT.

Keyword :

Contact resistance Fasteners Mathematical models Monitoring multiphysics coupling model structural health on-line monitoring Temperature measurement tightening torque Torque wind power dedicated busbar trunking (WPDBT) Wind power generation

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GB/T 7714 Tian, Yi , Lu, Xinsheng , Ye, Peng et al. On-Line Fault Diagnosis for Structural Health of Wind Power Dedicated Busbar Trunking [J]. | IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT , 2022 , 71 .
MLA Tian, Yi et al. "On-Line Fault Diagnosis for Structural Health of Wind Power Dedicated Busbar Trunking" . | IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT 71 (2022) .
APA Tian, Yi , Lu, Xinsheng , Ye, Peng , Huang, Xinbo , Zhu, Yongcan , Li, Shengtao et al. On-Line Fault Diagnosis for Structural Health of Wind Power Dedicated Busbar Trunking . | IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT , 2022 , 71 .
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Effect of Al(OH)3 and thermal ageing on the dielectric performance of composite insulator shed based on THz-TDS EI
会议论文 | 2021 | 4th IEEE China International Electrical and Energy Conference, CIEEC 2021
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Composite insulator shed is easy to be affected by temperature, ultraviolet radiation, and other factors, resulting in the declining of insulation performance and threatening the safe operation. This paper aims at studying the terahertz frequency domain characteristics of high temperature vulcanized (HTV) silicone rubber (SIR) by terahertz time-domain spectroscopy (THz-TDS). Besides, the effects of high temperature on HTV SIR and the ageing mechanism in terahertz frequency domain are explored. The results show that ATH (Al(OH)3) in HTV SIR has obvious characteristic peaks at 1.2THz and 1.33THz, which can also increase the refractive index and dielectric constant of HTV SIR. Moreover, thermal ageing increases the refractive index and dielectric constant of HTV SIR in terahertz frequency domain with ageing time. The results of Fourier transform infrared spectroscopy (FTIR) show that the intensity of -OH increases but the intensity of C-H, -CH3 and Si-O-Si decrease with ageing time, which helps explain the results of THz-TDS. This study shows that THz-TDS is of great significance to the detection of polymers. © 2021 IEEE.

Keyword :

Aluminum hydroxide Electric insulators Fourier transform infrared spectroscopy Frequency domain analysis Insulating materials Laser pulses Refractive index Rubber Silicon Silicone rubber Silicones Terahertz spectroscopy Terahertz waves Thermal aging Time domain analysis

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GB/T 7714 Wang, Mengqi , Liu, Hao , Li, Jiacai et al. Effect of Al(OH)3 and thermal ageing on the dielectric performance of composite insulator shed based on THz-TDS [C] . 2021 .
MLA Wang, Mengqi et al. "Effect of Al(OH)3 and thermal ageing on the dielectric performance of composite insulator shed based on THz-TDS" . (2021) .
APA Wang, Mengqi , Liu, Hao , Li, Jiacai , Li, Shengtao , Lian, Ze , Shen, Wei . Effect of Al(OH)3 and thermal ageing on the dielectric performance of composite insulator shed based on THz-TDS . (2021) .
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Arc Ablation Resistance and Dielectric Strength Properties of PTFE/BN Composites SCIE
期刊论文 | 2021 , 14 (20) | ENERGIES
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The substantial improvements in transmission voltage, which have been adopted to meet fast-growing energy demands, require more reliable power equipment and higher-quality insulating materials. The polytetrafluoroethylene (PTFE) nozzle, as the key part of a high-voltage circuit breaker, is often subjected to arc ablation and breakdown phenomena. Thus, it is very urgent to develop nozzles with better performance. In this study, PTFE/boron nitride (BN) composites were prepared. The relationships among the BN filler loading, thermal transition properties, spectral reflectance properties, arc ablation resistance, and AC dielectric breakdown performances, as well as their corresponding mechanisms, were studied. Experimental results show that the thermal conductivity and thermal diffusivity of PTFE/BN composites increased monotonously with BN loading, and that both parameters were improved by 41% and 44%, respectively, for 11 wt % composites compared with pure PTFE. Moreover, PTFE/BN composites had higher light reflectance in the wavelength range from 320 to 2500 nm. The PTFE/BN composites presented better arc ablation resistance performance with increased BN loading, which was improved by 88.5%. It is thought that the increased thermal conductivity, thermal diffusivity, the strong light reflectance, and surface sediment after arc ablation contribute to the improvement in arc ablation resistance performance. The AC breakdown strength of PTFE/BN composites was enhanced by 30.93%, attributed to the good heat dissipation properties introduced by the BN fillers. Thus, filling BN into the PTFE matrix would be helpful to solve the equipment issue that comes from the improvement in transmission voltage.

Keyword :

arc ablation BN breakdown PTFE thermal conductivity

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GB/T 7714 Zhao, Xianping , Nie, Yongjie , Zhao, Tengfei et al. Arc Ablation Resistance and Dielectric Strength Properties of PTFE/BN Composites [J]. | ENERGIES , 2021 , 14 (20) .
MLA Zhao, Xianping et al. "Arc Ablation Resistance and Dielectric Strength Properties of PTFE/BN Composites" . | ENERGIES 14 . 20 (2021) .
APA Zhao, Xianping , Nie, Yongjie , Zhao, Tengfei , Wang, Ke , Song, Bingchen , Yu, Shihu et al. Arc Ablation Resistance and Dielectric Strength Properties of PTFE/BN Composites . | ENERGIES , 2021 , 14 (20) .
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