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DOE OSTI · 2424759

Boron capture stabilizing the diffusion barriers in a two-step Mo-Si-B coated refractory multi-principal element alloy

Su, Ranran·Zhang, Hongliang·Liu, Longfei·Perepezko, John H.
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Abstract

A Mo-Si-B based coating has been applied on a refractory multi-principal element alloy (RMPEA) using a two-step coating strategy and has endured more than 750 hours of thermal cycling oxidation exposure between room temperature to 1300°C with a minimal weight change. Here, the formation of the Mo 5 SiB 2 diffusion barrier in the coating prevents the inward diffusion of the coating components. Then, boron is captured by the RMPEA, resulting in the formation of a solid solution X 5 SiB 2 (X= W, Mo, Ta, Nb, V) layer and an RMPEA-B boride layer underneath it that acts as the second diffusion barrier.

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36 MATERIALS SCIENCE42 ENGINEERINGCoatingDiffusion barrierHigh-temperature oxidationMaterials ScienceMetallurgy & Metallurgical EngineeringRMPEARefractory alloys

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Su, Ranran, Zhang, Hongliang, Liu, Longfei, Perepezko, John H.. 2023-06-24. Boron capture stabilizing the diffusion barriers in a two-step Mo-Si-B coated refractory multi-principal element alloy. https://doi.org/10.1016/j.corsci.2023.111365

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