In-situ fabrication of laminated SiC/TiSi2 and SiC/Ti3SiC2 ceramics by liquid silicon infiltration
2018
Abstract The laminated silicon carbide/titanium silicon (SiC/TiSi 2 ) and silicon carbide/titanium silicon carbide (SiC/Ti 3 SiC 2 ) ceramics were successfully designed and fabricated by liquid silicon (Si) infiltration. When the thickness of TiC layer was 150 and 450 µm, the TiSi 2 and Ti 3 SiC 2 phases were the main products in the TiC layer, respectively. The as-fabricated structural unit of laminated SiC/Ti 3 SiC 2 ceramics consisted of five layers of functionally graded materials, which has multiscale layered structure containing macro-layered structure and nano layered structure. The generation of hierarchical structure was attributed to the diffusion of Ti elements and in-situ formation of TiSi 2 and Ti 3 SiC 2 . The growth direction of Ti 3 SiC 2 was anisotropic, thus providing more paths for the crack propagation via deflection, branching, and delamination during fracture process. However, the crack propagation inside the Ti 3 SiC 2 phase included the pull out, bridging, lamination, deflection, and fracture of the single layer, which are the energy absorption and damage tolerance mechanisms of the Ti 3 SiC 2 phase.
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