Elevated Temperature Time-Dependent Mechanical Properties of Ceramic Matrix Composites

Woven SiC fiber-reinforced, SiC matrix matrix composite are being pursued for hot section components of gas turbine engines. Considerable work has been done to determine and understand the time-temperature-stress-environment dependent properties of these composites. In this presentation, an overview of elevated temperature creep rupture properties will be presented for select SiC/SiC composites tested in air and in vacuum. The composites discussed will include those reinforced with polycrystalline SiC fiber-types and considered to be some of the most creep-resistant CMCs available. The physical mechanisms which lead to failure will be highlighted as well as initial attempts to model life. In addition, approaches to improve creep-rupture properties will be discussed.