Protective Coating Shown to Improve Service Temps for Niobium-based Alloys
A research team from Northwestern Polytechnical University successfully achieved a duration of more than 128 hours at 1,500°C, thanks to multi-layered silicide coating.
Dr. Jia Sun and a research team from Northwestern Polytechnical University have published a paper describing how niobium- (Nb-) based alloys successfully achieved duration of more than 128 hours at ultrahigh temperature of 1,500°C, thanks to a multi-layered silicide coating.
Dr. Sun says that, through optimizing interfaces, the silicide coating with a layer of aluminum oxide-adsorbed particles exhibited three-times higher oxidation resistance capacity than one without it. The Al2O3-adsorbed-particle layer served as an element-diffusion barrier, and a porous Nb5Si3 layer that was formed provided a stress-transition zone, and these contributed to the significant improvement in performance.
These findings are described in the article entitled “A Long-term Ultrahigh Temperature Application of Layered Silicide Coated Nb Alloy in Air,” recently published in Applied Surface Science. Read it HERE.