Article ID Journal Published Year Pages File Type
1620895 Journal of Alloys and Compounds 2010 5 Pages PDF
Abstract
Bulk TiC/Ti3AlC2 composites containing 5 vol% TiC were fabricated by pressure-assisted self-propagating high-temperature synthesis, and their cyclic oxidation behavior was investigated at 550-950 °C in air for up to 40 cycles. The results demonstrated that at temperatures of 750-950 °C TiC/Ti3AlC2 composites displayed excellent cyclic oxidation resistance. The oxidation kinetics basically followed a parabolic rate law. As revealed by XRD and SEM/EDS, the scales consisted of an outer discontinuous layer of rutile TiO2 and an inner continuous layer of α-Al2O3. The scales were dense, adhesive to the substrate and resistant to thermal cycling. However, at lower temperatures of 550 and 650 °C, the oxidation kinetics followed a linear rate law with larger oxidation rates. The cyclic oxidation resistance was deteriorated owing to the formation of microcracks and voids in the scales.
Related Topics
Physical Sciences and Engineering Materials Science Metals and Alloys
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