Abstract
The effect of the addition of chromium on the oxidation resistance, in air, of fused TiC-C compositions has been studied as a function of temperature, up to 1550° C. It is shown that chromium retards the oxidation principally by modifying the fused microstructure through (a) suppression of the formation of fine eutectic graphite, and (b) formation of a Cr-rich carbide case around the primary TiC. The composition and the morphology of the oxide film formed on the carbide has been characterized. It is found to consist of several regions: first, there is a dense Cr-depleted surface next to the scalegas interfacE. Next, there is a porous seam with high chromium levels beneath which, and also adjacent to the bulk carbide, is another Cr-impoverished zone. The various features and their relation to the observed oxidation resistance is discussed.
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McNally, R.N., Bardhan, P. Oxidation resistance of fused TiC-C compositions containing chromium. J Mater Sci 18, 1213–1223 (1983). https://doi.org/10.1007/BF00551991
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DOI: https://doi.org/10.1007/BF00551991