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

Abstract

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.

Pull‐Off Behavior of MAX Phase Ceramic Bolted Connections: Experimental Testing and Simulation Analysis

“…On one hand, the material for the bolts should like ceramics, having a high melting temperature and excellent oxidation resistance; on the other hand, the material for the bolts should also like metals, exhibiting a good machinability and can be machined using conventional tools. Based on these demands, MAX‐phase ceramics, combining the merits of both ceramics and metals, are believed to be potential materials for high‐temperature bolt connections.…”

“…MAX‐phase ceramics, in which M is a transition metal, A is an A group element, and X is C or N, have promising physical and mechanical characteristics, including elative low density, relative high strength and toughness, a ratio of hardness to elastic modulus more typical of a ductile material, good thermal and electrical conductivities, as well as excellent thermal shock resistance and damage tolerance . Especially, the MAX‐phase ceramics combine the merits of both ceramics and metals, which make them promising candidates for high‐temperature bolts . To our best knowledge, there is no report investigating the MAX‐phase ceramic bolted connections.…”