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Significant improvement of the short-term high-temperature oxidation resistance of dense monolithic HfC/SiC ceramic nanocomposites upon incorporation of Ta

Wen, Qingbo and Riedel, Ralf and Ionescu, Emanuel (2018):
Significant improvement of the short-term high-temperature oxidation resistance of dense monolithic HfC/SiC ceramic nanocomposites upon incorporation of Ta.
In: Corrosion Science, Elsevier Science BV, Netherlands, pp. 191-198, 145, ISSN 0010-938X, DOI: 10.1016/j.corsci.2018.10.005, [Online-Edition: https://www.sciencedirect.com/science/article/pii/S0010938X1...],
[Article]

Abstract

The short-term oxidation (i.e., exposure time of up to 20 h) of dense monolithic (Hf,Ta)C/SiC-based ceramic nanocomposites at temperatures from 1200 to 1500 °C is presented and discussed. The oxidation behavior of HfC/SiC is similar to that of other UHTCs, indicating that it is mainly determined by the HfC phase. Ta incorporation into HfC leads to a strong decrease of the parabolic oxidation rates (3–4 orders of magnitude). Unlike HfC/SiC, Ta-containing nanocomposites form continuous multiphasic scales consisting of HfO2, Ta2O5 and Hf6Ta2O17, which are able to densify quickly during the oxidation process.

Item Type: Article
Erschienen: 2018
Creators: Wen, Qingbo and Riedel, Ralf and Ionescu, Emanuel
Title: Significant improvement of the short-term high-temperature oxidation resistance of dense monolithic HfC/SiC ceramic nanocomposites upon incorporation of Ta
Language: English
Abstract:

The short-term oxidation (i.e., exposure time of up to 20 h) of dense monolithic (Hf,Ta)C/SiC-based ceramic nanocomposites at temperatures from 1200 to 1500 °C is presented and discussed. The oxidation behavior of HfC/SiC is similar to that of other UHTCs, indicating that it is mainly determined by the HfC phase. Ta incorporation into HfC leads to a strong decrease of the parabolic oxidation rates (3–4 orders of magnitude). Unlike HfC/SiC, Ta-containing nanocomposites form continuous multiphasic scales consisting of HfO2, Ta2O5 and Hf6Ta2O17, which are able to densify quickly during the oxidation process.

Journal or Publication Title: Corrosion Science
Volume: 145
Publisher: Elsevier Science BV, Netherlands
Uncontrolled Keywords: Ceramic High-temperature corrosion Kinetic parameters Oxidation Tantalum oxide
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
Date Deposited: 19 Nov 2018 15:16
DOI: 10.1016/j.corsci.2018.10.005
Official URL: https://www.sciencedirect.com/science/article/pii/S0010938X1...
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