Contribution to the understanding of the relationship between mechanical and dielectric strengths of Alumina

Malec, David; Bley, Vincent; Talbi, Fatiha; Lalam, Fadila

doi:10.1016/j.jeurceramsoc.2010.07.024

Cited by 51 publications

(27 citation statements)

References 16 publications

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“…7. This dependence is indicated by the leastsquares fit with a slope of -0.5 and is in accordance with literature results [5][6][7][8][9].…”

Section: Discussionsupporting

confidence: 91%

“…Although the data rather exhibit a dependency of -0.4 than of -0.5 this small difference cannot be considered as significant, because 2 or 3 data points within the given error bars are not sufficient to decide between both trends. However, in our previous measurements [8] the breakdown strengths of AO-R0 are displayed in the range of 0.07 -1.5 mm fitting a slope of -0.5 which is consistent with [6,7,46] for alumina.…”

Section: Weibull Analysis and Thickness-dependencesupporting

confidence: 82%

“…In order to proof the known thicknessdependence of the breakdown strength [5][6][7][8][9] alumina samples without rice starch AO-R0 were ground to thicknesses of 0.3, 0.5, 1.0 and 1.5 mm. Alumina samples with rice starch AO-R2 were ground to thicknesses of 0.5 and 1.0 mm.…”

Section: Sample Preparationmentioning

confidence: 99%

“…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%

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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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“…7. This dependence is indicated by the leastsquares fit with a slope of -0.5 and is in accordance with literature results [5][6][7][8][9].…”

Section: Discussionsupporting

confidence: 91%

Section: Weibull Analysis and Thickness-dependencesupporting

confidence: 82%

Section: Sample Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

View full text Add to dashboard Cite

show abstract

“…The validity of this relation for bulk samples will be presented in the results. For bulk samples it is known that the breakdown strength is inversely proportional to the square root of the sample thickness [5,6]. This behavior is often explained as Weibull effect analogue to the mechanical case.…”

Section: Introductionmentioning

confidence: 99%

Dependence of the breakdown strength on thickness and permittivity

Neusel

Schneider

2013

2013 IEEE International Conference on Solid Dielectrics (ICSD)

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The dielectric breakdown strengths of Al 2 O 3 and BaTiO 3 ceramics have been investigated in terms of thickness and permittivity dependence. From the obtained results, it is possible to define a thickness dependent breakdown strength regime. For bulk samples it will be shown, that the breakdown strength is inversely proportional to the permittivity. Furthermore space charge limited conduction (SCLC) can be identified as dominating conduction mechanism in Al 2 O 3 and BaTiO 3 ceramics. Based on the experimental findings a recently developed Griffith type energy release rate model for tubular channels can be applied [1].

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Contribution to the Understanding of the Dielectric Breakdown Mechanism of ZTA Ceramics

Zhang

2022

Adv Eng Mater

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Herein, the breakdown mechanism of alumina‐based ceramics (Al2O3–ZrO2) is studied. The specimens are characterized for their density, phase structure, micromorphology, breakdown process, and breakdown channel by micro computed tomography, high‐speed cameras, etc. The study reveals that the dielectric breakdown stability of the samples shows a decreasing trend and the dielectric loss shows an upward trend with the increase of ZrO2 content. The tetragonal phase zirconia is beneficial to enhance the dielectric breakdown strength of the sample, which is related to the martensitic transformation to prevent crack propagation. Before the ceramic breakdown, the insulating oil first breaks down, causing electric sparks. Once the ceramic breakdown occurs, the charges are rearranged, and a large amount of heat energy is generated instantly to melt the substance around the breakdown channel and erupt to the surface to form pits under the action of high internal stress.

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Contribution to the understanding of the relationship between mechanical and dielectric strengths of Alumina

Cited by 51 publications

References 16 publications

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

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

Dependence of the breakdown strength on thickness and permittivity

Contribution to the Understanding of the Dielectric Breakdown Mechanism of ZTA Ceramics

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