Synthesis, thermal stability, and oxidation behavior of MoAlB coatings

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We aim to explore thermal stability and oxidation behavior of >10 micrometer thick MoAlB coatings for the first time. Both, thermal- and chemical stability data are required to gauge the application potential of MoAlB coatings in harsh environments. We have demonstrated both, the first-time lab scale synthesis of underdense and dense MoAlB coatings. We have also reported the only scale thickness measurement of MoAlB coatings that can be found in the literature: The oxidation kinetics of MoAlB coatings at 1200°C in ambient air seem to be comparable to those of bulk MoAlB and significantly lower than those reported for bulk Ti2AlC. However, the underlying mechanisms are unknown for MoAlB coatings. Based on a temperature- and time-dependent oxidation behavior study, we will obtain reliable data on the oxidation kinetics of MoAlB coatings and gain an understanding of the prevailing mechanisms during oxidation. Furthermore, these new findings will be compared to literature data and other protective coatings, particularly TiAlN and TiAlB2 which are currently investigated within the framework of a DFG-funded project at Materials Chemistry. This understanding will directly influence the knowledge-driven design of future high-temperature protective coatings.