Influence of Ti3SiC2Fiber Coating on Interface and Matrix Cracking in an SiC Fiber-Reinforced Polymer-Derived Ceramic

The effect of Ti 3 SiC 2 coatings on the interfacial properties of SiC‐fiber reinforced FeSiCr/SiC‐filled polymethylsilsesquioxane‐derived ceramics was investigated. An electrophoretically deposited Ti 3 SiC 2 coating was prepared on the fiber/matrix interface. Interfacial parameters such as frictional sliding stress and fracture energy were derived from fiber push‐out tests and correlated to the thickness of the Ti 3 SiC 2 layer. Compared to uncoated fibers, the Ti 3 SiC 2 interlayer gives rise for a pronounced enhance of interface shear strength, coefficient of friction, and sliding strength but a reduced fracture energy. With increasing Ti 3 SiC 2 coating thickness, thermal mismatch‐induced residual compressive stresses at the fiber/matrix interface tend to decrease significantly.