Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 27, Issue 16, Pages 4797-4805Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2007.02.201
Keywords
structural applications; thermal properties; ZrB2; SiC
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Microstructure modifications of an ultra-high temperature ZrB2-SiC ceramic exposed to,round simulated atmospheric re-entry conditions were investigated and discussed. Fluid dynamic numerical calculations were carried out to correlate and explain the experimental results. The cross-sectioning of the ceramic models after exposure (examined by SEM) showed a compact scale of zirconia (20 mu m thick) underlying an external silica thin coating. A partially SiC-depleted region, a few microns thick, underneath the zirconia sub-scale was also seen. The post-test analyses confirmed the potential of the ZrB2-SiC composite to endure re-entry conditions with temperature approaching 2000 degrees C, thanks to the formation of a steady-state external multiphase oxide scale. Numerical calculations, which simulated the chemical non-equilibrium flow around the ceramic model, matched well the experimental results only assuming a very low catalytic surface behavior. (C) 2007 Elsevier Ltd. All rights reserved.
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