Universität zu Köln

Yuan, J., Galetz, M., Luan, X. G., Fasel, C., Riedel, R. and Ionescu, E. (2016). High-temperature oxidation behavior of polymer-derived SiHfBCN ceramic nanocomposites. J. Eur. Ceram. Soc., 36 (12). S. 3021 - 3029. OXFORD: ELSEVIER SCI LTD. ISSN 1873-619X

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Abstract

Within this study, the oxidation behavior of SiHfBCN ceramic powders and monoliths was studied at temperatures from 1200 to 1400 degrees C. Both powder and monolithic samples exhibited parabolic oxidation behavior characterized by very low rates (10(-9)-10(-8) mg(2) 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 degrees 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. (C) 2015 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Yuan, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Galetz, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Luan, X. G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Fasel, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Riedel, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ionescu, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-265784
DOI:	10.1016/j.jeurceramsoc.2015.12.006
Journal or Publication Title:	J. Eur. Ceram. Soc.
Volume:	36
Number:	12
Page Range:	S. 3021 - 3029
Date:	2016
Publisher:	ELSEVIER SCI LTD
Place of Publication:	OXFORD
ISSN:	1873-619X
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language DIBORIDE-SILICON CARBIDE; DENSE; MICROSTRUCTURE; DECOMPOSITION; COMPOSITES; RESISTANCE; EVOLUTION; CORROSION Multiple languages Materials Science, Ceramics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/26578