Journal
MICROSCOPY AND MICROANALYSIS
Volume 25, Issue 3, Pages 583-591Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S1431927619000187
Keywords
Ceramic-matrix composites (CMCs); CT analysis; damage mechanics; microstructures
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Funding
- Science and Industry Endowment Fund
- Technical Cooperation Program (TTCP)
- Australian Research Council through the Centre of Excellence for Advanced Molecular Imaging
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In this study, we have examined ceramic matrix composites with silicon carbide fibers in a melt-infiltrated silicon carbide matrix (SiC/SiC). We subjected samples to tensile loads while collecting micro X-ray computed tomography images. The results showed the expected crack slowing mechanisms and lower resistance to crack propagation where the fibers ran parallel and perpendicular to the applied load respectively. Cracking was shown to initiate not only from the surface but also from silicon inclusions. Post heat-treated samples showed longer fiber pull-out than the pristine samples, which was incompatible with previously proposed mechanisms. Evidence for oxidation was identified and new mechanisms based on oxidation or an oxidation assisted boron nitride phase transformation was therefore proposed to explain the long pull-out. The role of oxidation emphasizes the necessity of applying oxidation resistant coatings on SiC/SiC.
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