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.
An alternative product for passivation...
The processes, chemicals and equipment, plus control and troubleshooting.
Our expert, Art Kushner, says yes, you can color stainless steel, but it is not a process that is typically performed in a plating shop. Read more about his answer.