Monotonic tension, fatigue and creep behavior of 3D braided KD-I-SiC-fiber-reinforced polymer-derived SiC-matrix composites at 1100^OC and 1300^OC for coated and uncoated specimens

Monotonic tension, fatigue and creep tests of a composite where a polymer derived silicon carbide (SiC) matrix has been reinforced with three-dimensional braided KD-I fiber were conducted in air at 1100^oC and 1300^oC. The tensile mechanical properties at high temperatures exhibit considerable degradation compared to that at room temperature. The damage at high temperature not only decrease the short-term properties, but also influenced the long-term behaviors such as fatigue and creep. The deformation behaviors at 1100^oC and 1300^oC were different in creep and fatigue tests. Whereas oxidation embrittlement controls damage evolution and failure mechanisms and coatings play an important role on enhance high temperature properties for these SiC/SiC composites.