Origin of thickness dependent dc electrical breakdown in dielectrics

Chen, George; Zhao, Junwei; Li, Shengtao; Zhong, Lisheng

doi:10.1063/1.4721809

Cited by 157 publications

(110 citation statements)

References 16 publications

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“…The thickness dependence of the electrical breakdown strength is purely empirical and obtained from many electrical breakdown experiments with different dielectrics under AC, DC, and impulse conditions, and various attempts have been made to understand why such a relationship exists. However the detailed mechanisms are poorly understood [7].…”

Section: (A) (B) (C)mentioning

confidence: 99%

Effect of Particle Size on the Mechanical and Electrical Properties of Epoxy/Spherical Silica Composites

Park

2013

Transactions on Electrical and Electronic Materials

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The effects of particle size on the mechanical and electrical properties of epoxy/spherical silica composites were studied. The silica particle sizes were varied from 5 to 30 μm and the filler content was fixed to 60 wt%. Tensile and flexural tests were carried out and the interfacial morphology was observed by scanning electron microscopy (SEM). The electrical insulation breakdown strength was estimated using sphere-sphere electrodes with different insulation thicknesses of 1, 2 and 3 mm. The tensile strength and flexural strength increased with decreasing particle size, while electrical insulation breakdown strength increased with increasing particle size.

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Section: (A) (B) (C)mentioning

confidence: 99%

Effect of Particle Size on the Mechanical and Electrical Properties of Epoxy/Spherical Silica Composites

Park

2013

Transactions on Electrical and Electronic Materials

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“…It is assumed that the initiation of breakdown happens, due to a sudden destabilization of trapped charges [1][2][3], which causes a current flow through the material. The breakdown strength, E b , defined as breakdown voltage, V b , per sample thickness, t, is reported to be dependent on the microstructure [2][3][4], sample thickness [5][6][7][8][9] and loading condition [8,[10][11][12]. The influence of the porosity [2,[13][14][15], grain size [2-4, 13, 15-17], purity and secondary phase [2-4, 6, 7] on the breakdown strength have been investigated.…”

Section: Introductionmentioning

confidence: 99%

Thickness-dependence of the breakdown strength: Analysis of the dielectric and mechanical failure

Neusel

Jelitto

Schmidt

et al. 2015

Journal of the European Ceramic Society

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The breakdown strength as well as the mechanical strength of ceramic materials decreases with increasing volume. The volume-effect of the mechanical strength can be explained by the Weibull theory. For the breakdown strength the same explanation has been often assumed.In order to validate this assumption breakdown strength and mechanical strength of alumina samples with defined porosities were compared. Differences in the Weibull moduli of breakdown and mechanical strength distributions indicate that the volume-effect cannot explain the thickness-dependence of the breakdown strength. In particular, the thicknessdependence of the breakdown strength always leads to a Weibull modulus of two which is not 2 in agreement with the measured Weibull moduli for samples with constant thickness. It can be concluded that the thickness-dependence of the breakdown strength cannot be explained by the Weibull concept. A recently developed breakdown model which is based on space charge injection is able to explain the experimental results.

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“…The breakdown distributions of the BOPP films also show a shift towards higher dielectric strength with increasing thickness. However, this is in contradiction to the inverse power law typically reported for solid dielectrics which proposes a decrease in dielectric strength with an increase in sample thickness [21]. Recently, the statistical behavior of dielectric breakdown of polymers has been modeled based on the fieldassisted percolation model which represents the amorphous, crystalline and free volume of polymer as a three-dimensional cubic lattice of randomly distributed traps with trap barriers in a certain range [22].…”

Section: Data Selection Threshold ( ) a Minmentioning

confidence: 51%

Effect of Film Thickness and Electrode Area on the Dielectric Breakdown Characteristics of Metallized Capacitor Films

Rytöluoto¹,

Lahti²

2018

NORD-IS

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An alternative approach for measuring breakdown characteristics of metallized and non-metallized polymer films has been previously developed at TUT. The method enables measurement of multiple breakdowns beyond the weakest point of each sample film by utilizing low-energy self-healing breakdown of metallized film. The method yields a large amount of breakdown data even from a relatively small sample area which enables the formation of detailed material-specific breakdown fingerprints. In this paper, some preliminary results of an ongoing further research on the area and thickness dependence of the breakdown characteristics of various polymer films are presented.Dielectric polymer films utilized in film capacitors are subjected to very high electric field stresses and thus, accurate statistical knowledge of their breakdown characteristics at the low breakdown probability region is of utmost importance in order to ensure safe and reliable design and operation in practice [1][2][3][4]. Breakdown measurement is typically realized as a short-term rampto-breakdown measurement and Weibull or other extreme-value distributions are then utilized for statistical analysis of the breakdown data [5]. However, weak spots in the polymer film due to the internal morphology and inherent properties of the polymer itself or due to extrinsic factors such as defects, voids, chemical impurities and non-ideal processing conditions can lead to a large deviation in the breakdown strength [6]. Moreover, the area and volume dispersion of the weak points in the film further complicates the dielectric strength evaluation [7][8][9]. Therefore, a large amount of breakdown data is required from a relatively large test area in order to gain a sufficient statistical relevance for practical applications. One approach for obtaining a large amount of breakdown data is to utilize an automatic breakdown strength measurement system such as in [10][11]. However, especially when the development and optimization phase of new dielectric materials such as polymer nanocomposites is considered, weak spots due to non-ideal processing conditions or other external factors may have a deteriorating effect on the dielectric breakdown strength [12]. Moreover, as the amount of sample material available for breakdown measurement may be scarce, the dielectric breakdown strength determined with only a small number of parallel samples may be misleading as it may be more representative of the weak spots due to extrinsic factors rather than a measure of the inherent properties of the material. Consequently, the true potential of the new dielectric may not be revealed completely. In return to this problem, an alternative approach for measuring breakdown characteristics of thin polymer films has been previously developed at TUT [13]. The method is based on the concept of measuring multiple breakdowns per sample film beyond the weakest point (or dielectric strength) of each film by utilizing lowenergy self-healing breakdown of metallized polymer film which effectively reduces ...

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Origin of thickness dependent dc electrical breakdown in dielectrics

Cited by 157 publications

References 16 publications

Effect of Particle Size on the Mechanical and Electrical Properties of Epoxy/Spherical Silica Composites

Effect of Particle Size on the Mechanical and Electrical Properties of Epoxy/Spherical Silica Composites

Thickness-dependence of the breakdown strength: Analysis of the dielectric and mechanical failure

Effect of Film Thickness and Electrode Area on the Dielectric Breakdown Characteristics of Metallized Capacitor Films

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