Abstract
Spent MoSi2-based materials were recycled as coating raw-materials, and MoSi2 and MoSi2-Ta2O5 coatings were fabricated to protect niobium using Spark Plasma Sintering (SPS). The micromorphology and anti-oxidation properties of the coatings at 1773 K were researched. Penetrating cracks were detected in the MoSi2 coating surface while no cracks appeared in MoSi2-Ta2O5 composite coating since the thermal expansion mismatch of the substrate and coating was reduced by adding Ta2O5. (Mo,Nb)5Si3 diffusion layer formed in MoSi2-Ta2O5 composite coatings, showing good metallurgical combination between substrate and coating. After oxidation at 1773 K for 20 h, crack-free Ta-Si-O layer with low oxygen permeability was formed on the composite coating. Compared with the oxidized MoSi2 coating, lower mass gain is gained by MoSi2-Ta2O5 composite coating under same conditions, presenting improved oxygen-barrier properties at high temperature.
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