Significant improvement of the self-protection capability of ultra-high temperature ceramic matrix composites

•Short term oxidation tests at 1500 °C and 1650 °C were carried out on UHTCMC.•Less than 30 vol% of ZrB2 into SiC(O) matrix is able to impart a fast passivation.•Oxidation resistance was affected by the distribution of ZrB2 into the SiC matrix. The oxidation behaviour of Cf/ZrB2-SiC with different f...

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Veröffentlicht in:Corrosion science 2021-08, Vol.189, p.109575, Article 109575
Hauptverfasser: Servadei, Francesca, Zoli, Luca, Vinci, Antonio, Galizia, Pietro, Sciti, Diletta
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Sprache:eng
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Zusammenfassung:•Short term oxidation tests at 1500 °C and 1650 °C were carried out on UHTCMC.•Less than 30 vol% of ZrB2 into SiC(O) matrix is able to impart a fast passivation.•Oxidation resistance was affected by the distribution of ZrB2 into the SiC matrix. The oxidation behaviour of Cf/ZrB2-SiC with different fibre architectures, manufactured by slurry impregnation, polymer infiltration and mild pyrolysis, was investigated. Short term oxidation tests in air were performed for 1 min and 5 min at 1500 °C and 1650 °C in a bottom loading furnace. Microstructure, oxide scale thickness and composition were analysed by SEM/EDS/XRD. Results indicated that a good dispersion of ZrB2 particles in the polymer derived SiC(O) matrix promoted the formation of compact scales filling surface holes left by fibre oxidation. 20−30 vol% of ZrB2 in the material was found a good compromise between lightness and oxidation resistance.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2021.109575