ZrO2 removing reactions of Groups IV–VI transition metal carbides in ZrB2 based composites

The ZrO2 removing reactions of Groups IV-VI transition metal carbides (MCs, M = Hf, Nb, Ta, W, Ti and V) in ZrB2 based ultrahigh-temperature ceramics (UHTCs) were investigated. The distinct roles of various MCs were observed during this process. According to thermodynamic analysis and experiment ver...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2011-03, Vol.31 (3), p.421-427
Main Authors: Zou, J, Zhang, G-J, Sun, S-K, Liu, H-T, Kan, Y-M, Liu, J-X, Xu, C-M
Format: Article
Language:English
Subjects:
Carbides
Ceramics
Hafnium
HFC
High density
Titanium
Transition metals
Zirconium dioxide
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Summary:The ZrO2 removing reactions of Groups IV-VI transition metal carbides (MCs, M = Hf, Nb, Ta, W, Ti and V) in ZrB2 based ultrahigh-temperature ceramics (UHTCs) were investigated. The distinct roles of various MCs were observed during this process. According to thermodynamic analysis and experiment verification, the sequence for oxide removing ability of different MCs is WC > VC > NbC > TaC > HfC > TiC. The importance of this study concerns the establishment of a map of reactivity of the transition metal carbides against ZrO2, in order to choose the proper additive for the densification of ZrB2-composites. Using the correct reactions and controlling the sintering atmospheres, high density ZrB2-SiC ceramics could be eventually obtained by pressureless sintering at temperatures around 2000-2200 C.
ISSN:0955-2219
DOI:10.1016/j.jeurceramsoc.2010.10.011