Yuan, J. ; Galetz, M. ; Luan, X.G. ; Fasel, C. ; Riedel, R. ; Ionescu, E. (2016)
High-temperature oxidation behavior of polymer-derived SiHfBCN ceramic nanocomposites.
In: Journal of the European Ceramic Society, 36 (12)
doi: 10.1016/j.jeurceramsoc.2015.12.006
Artikel, Bibliographie
Kurzbeschreibung (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.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2016 |
| Autor(en): | Yuan, J. ; Galetz, M. ; Luan, X.G. ; Fasel, C. ; Riedel, R. ; Ionescu, E. |
| Art des Eintrags: | Bibliographie |
| Titel: | High-temperature oxidation behavior of polymer-derived SiHfBCN ceramic nanocomposites |
| Sprache: | Englisch |
| Publikationsjahr: | September 2016 |
| Verlag: | Elsevier Science Publishing |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of the European Ceramic Society |
| Jahrgang/Volume einer Zeitschrift: | 36 |
| (Heft-)Nummer: | 12 |
| DOI: | 10.1016/j.jeurceramsoc.2015.12.006 |
| Kurzbeschreibung (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. |
| Freie Schlagworte: | High-temperature oxidation, Parabolic oxidation, Polymer-derived ceramic nanocomposites, SiHfBCN, Silica scale |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Disperse Feststoffe |
| Hinterlegungsdatum: | 26 Apr 2016 11:24 |
| Letzte Änderung: | 17 Dez 2018 12:11 |
| PPN: | |
| Sponsoren: | 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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