TY - JOUR
T1 - In-situ fabrication of laminated SiC/TiSi2 and SiC/Ti3SiC2 ceramics by liquid silicon infiltration
AU - Sun, Mengyong
AU - Bai, Yuhang
AU - Li, Mingxing
AU - Fan, Shangwu
AU - Cheng, Laifei
N1 - Publisher Copyright:
© 2018 Elsevier Ltd and Techna Group S.r.l.
PY - 2018/7
Y1 - 2018/7
N2 - The laminated silicon carbide/titanium silicon (SiC/TiSi2) and silicon carbide/titanium silicon carbide (SiC/Ti3SiC2) 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 Ti3SiC2 phases were the main products in the TiC layer, respectively. The as-fabricated structural unit of laminated SiC/Ti3SiC2 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 Ti3SiC2. The growth direction of Ti3SiC2 was anisotropic, thus providing more paths for the crack propagation via deflection, branching, and delamination during fracture process. However, the crack propagation inside the Ti3SiC2 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 Ti3SiC2 phase.
AB - The laminated silicon carbide/titanium silicon (SiC/TiSi2) and silicon carbide/titanium silicon carbide (SiC/Ti3SiC2) 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 Ti3SiC2 phases were the main products in the TiC layer, respectively. The as-fabricated structural unit of laminated SiC/Ti3SiC2 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 Ti3SiC2. The growth direction of Ti3SiC2 was anisotropic, thus providing more paths for the crack propagation via deflection, branching, and delamination during fracture process. However, the crack propagation inside the Ti3SiC2 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 Ti3SiC2 phase.
KW - Crack propagation
KW - In-situ fabrication
KW - Laminated ceramics
KW - MAX phase
UR - http://www.scopus.com/inward/record.url?scp=85044293967&partnerID=8YFLogxK
U2 - 10.1016/j.ceramint.2018.03.194
DO - 10.1016/j.ceramint.2018.03.194
M3 - 文章
AN - SCOPUS:85044293967
SN - 0272-8842
VL - 44
SP - 11410
EP - 11416
JO - Ceramics International
JF - Ceramics International
IS - 10
ER -