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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Kočí, Jan | Prague |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Rančić, M. |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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Kraft, Bastian
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Publications (6/6 displayed)
- 2024Herstellung und Charakterisierung von Nb- und Ta-Al₂O₃-Verbundwerkstoffen für Hochtemperaturanwendungen
- 2023Field assisted sintering of Ta–Al$_2$O$_3$ composite materials and investigation of electrical conductivity
- 2022Field assisted sintering of Ta–Al$_2$O$_3$ composite materials and investigation of electrical conductivitycitations
- 2022Coarse‐Grained Refractory Composite Castables Based on Alumina and Niobiumcitations
- 2022Field‐Assisted Sintering of Nb–Al$_2$O$_3$ Composite Materials and Investigation of Electrical Conductivitycitations
- 2021Synthesis of niobium-alumina composite aggregates and their application in coarse-grained refractory ceramic-metal castablescitations
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article
Field assisted sintering of Ta–Al$_2$O$_3$ composite materials and investigation of electrical conductivity
Abstract
Ta–Al$_2$O$_3$ composite samples with different compositions are prepared using Field Assisted Sintering Technique (FAST). Two different alumina powders are used to investigate the influence of the starting powders particle size on the microstructural features and the resulting electrical conductivity of the prepared composite materials. Percolation threshold of the two material systems is influenced by the metal fraction, as well as the alumina particle size of the starting powder. The percolation threshold for the fine- and the coarse-grained alumina is found to be at 15 vol.-% Ta and 7.5 vol.-% Ta, respectively. Microstructural investigations show significant differences in terms of particle shape of both, Ta and Al$_2$O$_3$ after sintering, most likely being the reason for the different percolation thresholds of the investigated materials. Anisotropy effects resulting from the processing using FAST and the influence on electrical properties are also shown.