Abstract
(Ti0.8Nb0.2)C exhibits high oxidation resistance in water vapor up to 1300 ºC, with the addition of 10% wt. SiC, even higher oxidation resistance could maintain up to 1500 ºC. The oxidation scales of both (Ti0.8Nb0.2)C and (Ti0.8Nb0.2)C-SiC composite show preferential oxidation and steep, opposite chemical gradients of Ti and Nb, implying that the predominant controlling factor is the outward diffusion of the metal elements by the interstitialcy mechanism. Dense and oriented (Ti1−xNbx)O2 oxidation scale accounts for the high oxidation resistance. A continuous and dense SiO2 layer further improved the oxidation resistance in (Ti0.8Nb0.2)C-SiC composite.
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