Microstructure Characterization and Mechanical Properties of Polymer‐Derived (Hf x Ta 1− x )C/SiC Ceramic Prepared upon Field‐Assisted Sintering Technique/Spark Plasma Sintering
Advanced Engineering Materials, vol. 26
Abstract
The high‐temperature microstructural evolution and mechanical properties of two SiC‐based polymer‐derived ceramics with different Hf:Ta molar ratios are investigated using electron microscopy techniques and manipulated by nanoindentation. The as‐pyrolyzed ceramic powder consists of an amorphous Si(Hf x Ta 1− x )C(N,O) structure (where x = 0.2, 0.7) with localized nanocrystalline transition metal carbides (TMCs). Subsequent application of the field‐assisted sintering technique (FAST) for high‐temperature consolidation results in a crystalline (Hf x Ta 1− x )C/SiC ultra‐high temperature ceramic nanocomposite. The microstructure contains powder particle‐sized grains and sinter necks between the former powder particles. The powder particles consist of a β‐SiC matrix and small TMCs. Large TMCs are observed on the internal surfaces of former powder particles. This is due to the pulsed direct current and the resulting Joule heating that facilitates diffusion as well as oxygen impurities. Sinter necks of large β‐SiC grains form during the FAST process. The microstructural regions are assessed using high‐throughput nanoindentation. The hardness for SiC/(Hf 0.7 Ta 0.3 )C is measured on the formed grains and the sinter necks giving mean hardness values of about 27 and 37 GPa, respectively.
Authors 11
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Nathalie Thor corresponding
Technische Universität Darmstadt
Affiliation as printed
Institute of Applied Geoscience Technical University Darmstadt Schnittspahnstraße 9 D‐64287 Darmstadt Germany
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Karlsruhe Institute of Technology
Affiliation as printed
Institute for Applied Materials (IAM) Karlsruhe Institut für Technologie (KIT) Engelbert‐Arnold‐Straße 4 D‐76131 Karlsruhe Germany
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Technische Universität Darmstadt
Affiliation as printed
Institute of Materials Science Technical University Darmstadt Otto‐Berndt‐Straße 3 D‐64287 Darmstadt Germany
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Society for Chemical Engineering and Biotechnology · DECHEMA-Forschungsinstitut
Affiliation as printed
Materials and Corrosion DECHEMA Research Institute Theodor‐Heuss‐Allee 25 D‐60486 Frankfurt am Main Germany
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Society for Chemical Engineering and Biotechnology · DECHEMA-Forschungsinstitut
Affiliation as printed
Materials and Corrosion DECHEMA Research Institute Theodor‐Heuss‐Allee 25 D‐60486 Frankfurt am Main Germany
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Affiliation as printed
Institute of Energy and Climate Research (IEK) Forschungszentrum Jülich GmbH Wilhelm‐Johnen Straße D‐52428 Jülich Germany
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Forschungszentrum Jülich · RWTH Aachen University
Affiliation as printed
Chair of Energy Engineering Materials RWTH Aachen University D‐52056 Aachen Germany
Institute of Energy and Climate Research (IEK) Forschungszentrum Jülich GmbH Wilhelm‐Johnen Straße D‐52428 Jülich Germany
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Technische Universität Darmstadt
Affiliation as printed
Institute of Materials Science Technical University Darmstadt Otto‐Berndt‐Straße 3 D‐64287 Darmstadt Germany
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Johannes Gutenberg University Mainz · Technische Universität Darmstadt
Affiliation as printed
Centre for High Resolution Electron Microscopy (EMC-M) Johannes Gutenberg University Mainz Duesbergweg 10‐14 55128 Mainz Germany
Institute of Applied Geoscience Technical University Darmstadt Schnittspahnstraße 9 D‐64287 Darmstadt Germany
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Justus-Liebig-Universität Gießen
Affiliation as printed
Department of Inorganic and Analytical Chemistry Justus‐Liebig‐University Giessen Heinrich‐Buff‐Ring 17 D‐35392 Giessen Germany
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Karlsruhe Institute of Technology
Affiliation as printed
Institute for Applied Materials (IAM) Karlsruhe Institut für Technologie (KIT) Engelbert‐Arnold‐Straße 4 D‐76131 Karlsruhe Germany
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