Understanding the thermal ageing performance of epoxy aluminium nitride nanocomposites through space charge studies and by LIBS analysis

Guvvala, Nagaraju; Babu, Myneni Sukesh; Sarathi, R.

doi:10.1049/iet-smt.2020.0342

Cited by 3 publications

(5 citation statements)

References 30 publications

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“…The internal factors refer to material properties, such as curing agent type, filler properties, and modification treatment, while the external factors are highly associated with operating ambient, including temperature condition, applied electric field, humidity, and electrode status. [29,[33][34][35][36][37][38][39][40][41][42][58][59][60][61][62][63][64][141][142][143][144][145][146][147][148][149] In this section, we mainly focus on three types of EP-based dielectric materials, i.e., pure EP, EP impregnated paper (EIP) composites, and EP-based nanocomposites. A broad perspective on space charge behavior is placed based on the progress of experimental measurements with the consideration of varied internal and external factors.…”

Section: Experimental Study Of Space Charge Distribution In Ep-based ...mentioning

confidence: 99%

Section: Experimental Study Of Space Charge Distribution In Ep‐based ...mentioning

confidence: 99%

“…[ 29,30,33,34 ] The accumulated space charge may cause deterioration/aging and even partial discharge or dielectric breakdown of dielectric materials. [ 35–40 ] Specifically, the extensive application of EP‐based dielectric materials in HVDC transmission projects eagerly calls for relevant studies on the space charge behavior under practical working conditions. Moreover, the miniaturization and integration of power electronic devices bring increasingly complicated interfaces at different scales in insulation systems, which leads to more severe charge‐related issues at local interfaces in the long run.…”

Section: Introductionmentioning

confidence: 99%

“…[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.…”

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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: Experimental Study Of Space Charge Distribution In Ep-based ...mentioning

confidence: 99%

Section: Experimental Study Of Space Charge Distribution In Ep‐based ...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

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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“… Chillu et al (2020) studied the space charge injection threshold and dissipation properties of aluminum–epoxy nanocomposites. Guvvala et al (2020) studied the effect of thermal aging on the space charge characteristics of epoxy–aluminum nitride nanocomposites and successfully used laser-induced breakdown spectroscopy to distinguish the aging patterns. Haque et al (2017) studied the charge detrapping and dipole polarization properties of epoxy by measuring the discharge current and identified the dipole polarization and space charge detrapping in the discharge current by using the Hamon approximation.…”

Section: Introductionmentioning

confidence: 99%

Space Charge Dynamics in Epoxy Resins Under the Influence of a Long-Term High Electric Field at Various Temperatures

Zhang

Jin

et al. 2022

Front. Chem.

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As the main insulating material of an ultra-high voltage (UHV) resin impregnated paper (RIP) bushing, epoxy resin accumulates space charge under the DC voltage, which would affect the insulation properties of the bushing. In this article, the evolution of space charge accumulation and dissipation within the epoxy resin samples was measured under the influence of a long-term (24 h) electric field of 60 kV/mm at 40°, 60°, 80°, and 100°C. The experimental results show that the space charge transport in the epoxy sample was a long-time dynamic process. When the temperature was not greater than 60°C, only homocharge accumulation was observed within the samples, and the space charge distribution did not reach a stable state even after 24 h of voltage application. When the temperature was not lower than 80°C, the positive heterocharge accumulation was observed at the interface between cathode and epoxy. Through analysis by fitting and numerical simulation, it was verified that the positive heterocharge accumulation was caused by the limitation of the hole extraction, and the transport of holes within the samples obeyed the jump conductance model.

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