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Meeting 2022 TMS Annual Meeting & Exhibition
Symposium Refractory Metals
Presentation Title Oxidation Behavior of Mo-Si-B-Al Alloys at Elevated Temperature
Author(s) Longfei Liu, Ranran Su, John Perepezko
On-Site Speaker (Planned) Longfei Liu
Abstract Scope Both isothermal and cyclic oxidation behavior of Mo-6Si-12B-(1, 2, 4, 8)Al samples have been studied. With an increase of Al content, isothermal oxidation resistance is enhanced while cyclic oxidation resistance is degraded. The Mo-6Si-12B-4Al sample oxide layer consists of both Al-doped borosilicate glass phase and mullite phase and has the best overall oxidation performance. A model was developed to analyze the transient oxidation stage and provides a good agreement with the experimental data. The Al diffusion rate is two orders of magnitude bigger than Si in mullite, it accounts for the high Al sample exhibiting the best isothermal resistance. The low viscosity of the Al-doped borosilicate glass provide a self-healing effect which is related to the good cyclic oxidation performance of low Al content samples.
Proceedings Inclusion? Planned:
Keywords High-Temperature Materials, Surface Modification and Coatings, Characterization


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