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High-temperature oxidation behavior of polymer-derived SiHfBCN ceramic nanocomposites

Yuan, J. and Galetz, M. and Luan, X.G. and Fasel, C. and Riedel, R. and Ionescu, E. (2016):
High-temperature oxidation behavior of polymer-derived SiHfBCN ceramic nanocomposites.
In: Journal of the European Ceramic Society, Elsevier Science Publishing, pp. 3021-3028, 36, (12), ISSN 09552219,
[Online-Edition: http://dx.doi.org/10.1016/j.jeurceramsoc.2015.12.006],
[Article]

Abstract

Within this study, the oxidation behavior of SiHfBCN ceramic powders and monoliths was studied at temperatures from 1200 to 1400 °C. Both powder and monolithic samples exhibited parabolic oxidation behavior characterized by very low rates (10−9–10−8 mg2 cm−4 h−1). The activation energy of 112.9 kJ mol−1, which was determined for the SiHfBCN powder, is comparable to that of other silica formers such as silicon or SiC and relates to the diffusion of molecular oxygen through silica scale. Whereas, the values determined for the SiHfBCN ceramic monoliths (174 and 140 kJ mol−1, depending on the Hf content) indicate the complex nature of their oxidation process, leading at temperatures below 1300 °C to a continuous oxide scale consisting of borosilicate, silica, m-and t-HfO2. At higher temperatures, the oxide scale consists of silica, HfSiO4 as well as m-and t-HfO2 and becomes discontinuous, probably due to the evaporation of boria.

Item Type: Article
Erschienen: 2016
Creators: Yuan, J. and Galetz, M. and Luan, X.G. and Fasel, C. and Riedel, R. and Ionescu, E.
Title: High-temperature oxidation behavior of polymer-derived SiHfBCN ceramic nanocomposites
Language: English
Abstract:

Within this study, the oxidation behavior of SiHfBCN ceramic powders and monoliths was studied at temperatures from 1200 to 1400 °C. Both powder and monolithic samples exhibited parabolic oxidation behavior characterized by very low rates (10−9–10−8 mg2 cm−4 h−1). The activation energy of 112.9 kJ mol−1, which was determined for the SiHfBCN powder, is comparable to that of other silica formers such as silicon or SiC and relates to the diffusion of molecular oxygen through silica scale. Whereas, the values determined for the SiHfBCN ceramic monoliths (174 and 140 kJ mol−1, depending on the Hf content) indicate the complex nature of their oxidation process, leading at temperatures below 1300 °C to a continuous oxide scale consisting of borosilicate, silica, m-and t-HfO2. At higher temperatures, the oxide scale consists of silica, HfSiO4 as well as m-and t-HfO2 and becomes discontinuous, probably due to the evaporation of boria.

Journal or Publication Title: Journal of the European Ceramic Society
Volume: 36
Number: 12
Publisher: Elsevier Science Publishing
Uncontrolled Keywords: High-temperature oxidation, Parabolic oxidation, Polymer-derived ceramic nanocomposites, SiHfBCN, Silica scale
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: 26 Apr 2016 11:24
Official URL: http://dx.doi.org/10.1016/j.jeurceramsoc.2015.12.006
Identification Number: doi:10.1016/j.jeurceramsoc.2015.12.006
Funders: JY acknowledges financial support from China Scholarship Council (CSC) during his stay at TU Darmstadt. Financial support from European Commission through the Marie-Curie ITN project “Functional Nitrides for Energy Applications, FUNEA” (FP7-PITN-GA-2010-2, as well as from the R&D Convergence Program of MSIP (Ministry of Science, ICT and Future Planning) and NST (National Research Council of Science & Technology) of Republic of Korea (Grant no. CMIP-13-4-KIMS) is gratefully acknowledged.
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