In-situ fabrication of laminated SiC/TiSi2 and SiC/Ti3SiC2 ceramics by liquid silicon infiltration. Issue 10 (July 2018)

• Record Type: Journal Article
• Authors: Sun, Mengyong; Bai, Yuhang; Li, Mingxing; Fan, Shangwu; Cheng, Laifei
• Is Part Of: Ceramics international. Volume 44:Issue 10(2018)
• Page Start: 11410
• Page End: 11416
• Publication Date: 2018-07
• Subjects: Laminated ceramics -- MAX phase -- In-situ fabrication -- Crack propagation; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2018.03.194
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: The laminated silicon carbide/titanium silicon (SiC/TiSi2 ) and silicon carbide/titanium silicon carbide (SiC/Ti3 SiC2 ) ceramics were successfully designed and fabricated by liquid silicon (Si) infiltration. When the thickness of TiC layer was 150 and 450 µm, the TiSi2 and Ti3 SiC2 phases were the main products in the TiC layer, respectively. The as-fabricated structural unit of laminated SiC/Ti3 SiC2 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 TiSi2 and Ti3 SiC2 . The growth direction of Ti3 SiC2 was anisotropic, thus providing more paths for the crack propagation via deflection, branching, and delamination during fracture process. However, the crack propagation inside the Ti3 SiC2 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 Ti3 SiC2 phase.