Investigation of the oxidative resistance of high-temperature coating on a SiC material under exposure to high-enthalpy flow

Abstract

The method, procedure, and results of the investigation of a high-speed air plasma flow effect on the structure of an ultrahigh-temperature coating made for a composite silicon carbide material are considered. The coating is based on hafnium diboride, silicon carbide, and oxides of hafnium, yttrium, and zirconium. The effect of a high-speed plasma flow on the samples was studied in a VAT-104 wind tunnel (Central Aerohydrodynamic Institute); this facility enables simulation of the conditions of high-velocity flight in the upper atmosphere. During the tests, the main parameters of the plasma flow were recorded, and the temperature distribution of the sample was measured. The weight loss of the samples was determined. Using the results of numerical parametric simulation of flow past and heat transfer of the samples, the catalytic activity of the coating was determined. After testing in a high-enthalpy flow, X-ray diffraction analysis and X-ray phase analysis of the samples were performed, and their surface microstructure was analyzed.