Microstructural studies of burner-rig thermally fatigued SiC continuous fibre/Si_3N_4 composite

摘要

Ceramic materials are a promising candidate for high-temperature structural applications because of their high melting point, high-temperature strength, stiffness, oxidation resistance, and low density. However, their intrinsic brittleness limits their widespread applications. The incorporation of strong and stiff fibres into a ceramic matrix imparts damage tolerance capability to the material. The application of continuous fibre ceramic composites (CFCCs) in critical components, such as jet-engine turbine blades and tubular products for heat exchangers, involves thermal or thermomechanical cycling. However, thermal or thermomechanical fatigue studies, especially those simulating the component's cyclic service environment, are scarce.