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

Neelmani,; Suematsu, Hisayuki; Sarathi, R.

doi:10.1088/2053-1591/ab5ee3

Cited by 13 publications

(15 citation statements)

References 24 publications

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“…[55][56][57] It has been long demonstrated that the addition of nanofillers with appropriate concentrations can effectively inhibit the accumulation of space charge. [58][59][60][61][62][63][64] For instance, at 20 °C and 15 kV mm −1 , the addition of 2 wt% nano-MgO into EP inhibited 65% of space charge accumulation (0.07 C m −3 ) compared to filler-free EP (0.2 C m −3 ). [65] Similar inhibit effects have been found in systematic studies on EP-based nanocomposites using different kinds of inorganic nanoparticles such as nano-Al 2 O 3 and nano-SiO 2 .…”

Section: Introductionmentioning

confidence: 99%

“…[66,67] Though some studies pointed out that nanoparticles do not necessarily lead to improved properties, [68][69][70] an enhanced charge suppressing ability can be obtained through a balanced selection of filler type, size, concentration and surface treatment. [58][59][60][61]66,67] Accordingly, several proposed theoretical models (e.g., double layer model by Lewis, [71,72] multicore model by Tanaka et al [73,74] and multiregion structure model by Li [75][76][77] ) have been taken into consideration by researchers to further rationalize the experimental observations of space charge in nanodielectric materials.…”

Section: Introductionmentioning

confidence: 99%

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Space Charge Behavior in Epoxy‐Based Dielectrics: Progress and Perspective

Liu

Xie

et al. 2022

Adv Elect Materials

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temperature and complex electric field conditions. [1][2][3] Epoxy resin (EP) is a class of polymer oligomers containing two or more epoxide groups based on organic compounds (e.g., aliphatic, alicyclic, and aromatic). As a prepolymer, EP shows excellent performance after its reaction with a curing agent to form an insoluble polymer with a 3D network structure. EP has desirable insulating characteristics, [4][5][6][7] heat resistance, [8] high mechanical strength, [9] low shrinkage, [10] chemical stability, and adhesive properties, which originate from its compact structure and tunable functional groups. The above mentioned outstanding performances, along with characteristics of easy processing and formula design flexibility, enable the extensive use of EP-based materials in power equipment and electronic devices [11] (Figure 1), including bar insulation and impregnating varnish in transformers, main insulation in dry-type bushings and wall bushings, insulator in gas-insulated switchgear (GIS) and gas-insulated transmission line (GIL), epoxy molding compound for integrated circuit (IC) packaging. It is noteworthy that EPs typically possess lower glass transition temperature (T g ) compared to other high-T g dielectric polymer substitutes used in microelectronic systems such as benzocyclobutene, [12] polyimide (PI), [13] and maleimide. [14] Besides high T g , high thermal conductivity and low coefficient of thermal expansion of EPs are always desired for their industrial applications, especially from an electronic packaging perspective. To date, considerable efforts have been made to improve the heat endurance and heat dissipation capabilities of EP-based dielectric materials by inorganic particle doping [15][16][17][18][19][20][21][22][23][24] and chemical modification. [25][26][27] Furthermore, EP is also an indispensable adhesive that is extensively used in power equipment. [28][29][30][31][32] Yet, potential reliability hazards may exist during the operation of power equipment and electronic devices, especially at high temperatures and under high voltage direct current (HVDC) application, one of which is the space charge accumulation in EP-based dielectric materials. [29,30,33,34] The accumulated space charge may cause deterioration/aging and even partial discharge or dielectric breakdown of dielectric materials. [35][36][37][38][39][40] Specifically, the extensive application of EP-based dielectric materials in HVDC transmission projects eagerly calls for relevant studies on the space charge behavior Epoxy-based dielectrics are extensively used in grid-connected energy systems and modern microelectronics as electrical insulation, adhesive, and packaging components. However, space charge accumulation in epoxy-based dielectrics is a foremost factor threatening device stability and lifespan, especially under conditions of high voltage direct current and high temperatures during long-term operation, and thus are investigated systematically. This article reviews the state-of-the-art progress in understanding and r...

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Space Charge Behavior in Epoxy‐Based Dielectrics: Progress and Perspective

Liu

Xie

et al. 2022

Adv Elect Materials

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“…In the present case, it may happen that due to the presence of high density of shallow traps, charges are quickly captured in the adjacent layer of electrodes. This results in homo‐charge accumulation, which reduces electric field density at the metal‐dielectric interface, this, in turn, reduces the Schottky charge injection process [37]. Accumulation of homo‐charge in epoxy–alumina nanocomposites have been observed with pulse electro‐acoustic measurements in [38].…”

Section: Resultsmentioning

confidence: 99%

Investigations on the effect of ageing on charge de‐trapping processes of epoxy–alumina nanocomposites based on isothermal relaxation current measurements

Maur

Haque

Pottekat

et al. 2020

IET Nanodielectrics

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“…CIV value increased with the increment in the content of the alumina nanofiller. Increment in the value of CIV could be attributed to the increment in the hydrophobicity of the epoxy of alumina nanocomposites with the increment in the wt% of alumina nanofiller [18]. Water droplet under high electric field, it elongates along the direction of high electric field which lead to the enhancement of the electric field near the triple point.…”

Section: F = ∫ ∫ I(θ Z) T(θ Z) E(θ Z) [1 − K(z)]dθ Dzmentioning

confidence: 99%

Influence of Nanofiller Dispersion on Electrical and Mechanical Properties of Epoxy Alumina Nanocomposites

Neelmani¹,

Sarathi²,

Suematsu³

et al. 2021

RCMA

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The electrical and mechanical properties of the epoxy alumina nanocomposites depend on the uniform dispersion of the nanofiller in the epoxy matrix. Epoxy alumina nanocomposites were prepared using 1, 3, and 5 wt% of alumina nanofiller, and electrical and mechanical properties were analyzed using experimental and modelling studies. Water droplet initiated corona inception voltage (CIV) was identified using fluorescence fiber technique and by Ultra High Frequency (UHF) technique, under AC and DC voltages. The CIV formed due to water droplet have reduced drastically with increase in number of droplets and fluorescent fiber technique found to be more sensitive to identify water droplet initiated discharges. A micro mechanical model was proposed to analyse the combined effect of the interphase and agglomeration properties of the alumina nanoparticles on the tensile strength of epoxy alumina nanocomposites. Variation in ϕagg, Eagg, and E were analysed by adopting the non-parametric distribution of alumina nanoparticles and Young’s modulus increased with the increment in the alumina nanofiller dispersion level. The presence of aggregated particles exhibits a negative effect on the tensile properties of nanocomposites.

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

Cited by 13 publications

References 24 publications

Space Charge Behavior in Epoxy‐Based Dielectrics: Progress and Perspective

Space Charge Behavior in Epoxy‐Based Dielectrics: Progress and Perspective

Investigations on the effect of ageing on charge de‐trapping processes of epoxy–alumina nanocomposites based on isothermal relaxation current measurements

Influence of Nanofiller Dispersion on Electrical and Mechanical Properties of Epoxy Alumina Nanocomposites

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