Abstract
The high temperature oxidation resistance of a modified silicide coating on niobium was prepared by the slurry firing method. The cyclic antioxidation characteristics of the coating have been tested from room temperature to 1600°C. The microstructures and phase distribution of the coating have been characterised by SEM, EDX and XRD analyses, and the microhardness was measured on the cross-section of the coating. A typical multilayer structure was observed on the coating. The non-uniform distribution of the composition is likely due to the interdiffusion and reaction between the different layers. Crack propagation was observed during the cyclic high temperature oxidation test and was attributed to the thermal expansion mismatch.
Get full access to this article
View all access options for this article.