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Development and Oxidation Resistance of B-doped Silicide Coatings on Nb-based Alloy  

Li, Xiaoxia (School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics)
Zhou, Chungen (School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics)
Publication Information
Corrosion Science and Technology / v.7, no.4, 2008 , pp. 233-236 More about this Journal
Abstract
Halide-activated pack cementation was utilized to deposit B-doped silicide coating. The pack powders were consisted of $3Wt.c/oNH_4Cl$, 7Wt.c/oSi, $90Wt.c/oAl_2O_3+TiB_2$. B-doped silicide coating was consisted of two layers, an outer layer of $NbSi_2$ and an inner layer of $Nb_5Si_3$. Isothermal oxidation resistance of B-doped silicide coating was tested at $1250^{\circ}C$ in static air. B-doped silicide coating had excellent oxidation resistance, because continuous $SiO_2$ scale which serves as obstacle of oxygen diffusion was formed after oxidation.
Keywords
Nb-based alloy; B-doped silicide coating; Oxidation resistance;
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