The effect of extreme temperature in an oxidising atmosphere on dense tantalum carbide (TaC)

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dc.contributor.authorLashtabeg, Aen_AU
dc.contributor.authorSmart, Men_AU
dc.contributor.authorRiley, Den_AU
dc.contributor.authorGillen, ALen_AU
dc.contributor.authorDrennan, Jen_AU
dc.date.accessioned2015-10-13T00:08:35Zen_AU
dc.date.available2015-10-13T00:08:35Zen_AU
dc.date.issued2013-01-01en_AU
dc.date.statistics2015-10-07en_AU
dc.description.abstractThis study describes the microstructure development as dense tantalum carbide (TaC), which is subjected to extreme temperature environments (3,000 °C) in the presence of oxygen. These are conditions that structural materials are expected to experience in hypersonic aero-propulsion applications. The conditions produce molten oxide which may provide a temporary resistance to rapid oxidation and may go some way to repair thermal shock cracks, however, at the same time the liquid is observed to attack the dense ceramic both chemically and mechanically. A reaction mechanism is suggested which involves dissolution of TaC in the oxide melt and a two step oxidation; first the reaction of TaC with oxygen to form Ta(O,C) and TaO x , resulting in dissolved dissociated carbon, followed by the reaction of dissolved carbon with oxygen to produce gas. This microstructural analysis of one of the candidate ultra-high temperature ceramic materials for hypersonic flight provides new insight into the mechanism of TaC oxidation and the role of the liquid oxide layer in acting not only as a protective layer to further oxidation, as is commonly reported, but also as a dynamic component that promotes erosion of the TaC surface and is a source of further oxygenation of the TaC surface. If the formation of the liquid phase can be better controlled and the reaction of the liquid phase with the matrix be slowed and stabilised, then the formation of a liquid phase at the surface of TaC may provide a key to designing materials that can withstand the rigours of hypersonic flight. © 2012, Springer.en_AU
dc.identifier.citationLashtabeg, A., Smart, M., Riley, D., Gillen, A., & Drennan, J. (2013). The effect of extreme temperature in an oxidising atmosphere on dense tantalum carbide (TaC). Journal of Materials Science, 48(1), 258-264. doi:10.1007/s10853-012-6740-4en_AU
dc.identifier.govdoc6139en_AU
dc.identifier.issn0022-2461en_AU
dc.identifier.issue1en_AU
dc.identifier.journaltitleJournal of Materials Scienceen_AU
dc.identifier.pagination258-264en_AU
dc.identifier.urihttp://dx.doi.org/10.1007/s10853-012-6740-4en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/6309en_AU
dc.identifier.volume48en_AU
dc.language.isoenen_AU
dc.publisherSpringeren_AU
dc.subjectTantalum carbidesen_AU
dc.subjectOxidationen_AU
dc.subjectErosionen_AU
dc.subjectOxygenen_AU
dc.subjectCarbidesen_AU
dc.subjectCeramicsen_AU
dc.titleThe effect of extreme temperature in an oxidising atmosphere on dense tantalum carbide (TaC)en_AU
dc.typeJournal Articleen_AU
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