Abstract
Solid solution MAX phase coatings of (Ti1-x, Nbx)2AlC, fabricated using a hybrid technique combining high-power impulse magnetron sputtering (HiPIMS) and DC magnetron sputtering (DCMS), were extensively evaluated for their oxidation resistance at 750 ℃. Compared to Ti2AlC, the oxidation rate of (Ti1-x, Nbx)2AlC significantly decreased, primarily due to the inhibition of non-protective TiO2 oxide growth. A thin, single-layer oxide scale consisting of TiO2 and Al2O3 formed on the (Ti1-x, Nbx)2AlC coatings, while the Ti2AlC coatings were nearly completely consumed after 24 h oxidation. The substitution of Ti4+ with Nb5+ played a crucial role in reducing the number of oxygen vacancies and enhancing the oxidation resistance of Ti2AlC.
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