Mechanical Testing of a Coated Carbon/Carbon Composite at Elevated Temperatures in Air

摘要

The controlled nucleation thermochemical deposition (CNTD) process can apply a silicon carbide coating to carbon/carbon (C/C) composites. Coated C/C composite materials are potentially useful in advanced gas turbine engines particularly as static components, although rotating components are feasible. Success of such a system will require a coating that will ensure oxidation resistance and mechanical integrity. This report represents a preliminary characterization of mechanical properties of a silicon carbide coated, C/C composite at ambient and elevated temperature in air. The coating was applied by the controlled nucleation thermochemical deposition (CNTD) process. The strength, static fatigue, and oxidation results of the coated composite were favorable at temperatures up to 2372 F (1300 C) in air. Keywords: Ceramic coatings; Flexural strength; Thermal shock; Rupture; Microstructure; Fractography.