期刊
CERAMICS INTERNATIONAL
卷 46, 期 6, 页码 7861-7870出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2019.12.005
关键词
SiC; Nanowires; Combustion synthesis; TaSi2; Carbon fibers; Ceramic-matrix composites
资金
- Russian Science Foundation [19-19-00117]
- Russian Science Foundation [19-19-00117] Funding Source: Russian Science Foundation
This study proposes a combustion-based ceramic matrix composite processing technique intended on single-step in situ deposition of single-crystal SiC nanowires (SiCnw) on the surface of carbon fibers (C-f) and formation of SiCnw-reinforced SiC matrix. This was accomplished by Ta-catalyzed combustion of poly-(C2F4)-containing reactive mixtures with pre-mixed chopped Cf. Depending on the combustion conditions, carbon fiber surface is subjected either to formation of diffusion layers, ceramic particle incrustation or growth of continuous arrays of carbon-coated single-crystal SiCnw with a nearly defect-free lattice, 10-50 nm diameter and 15-20 mu m length. Thermodynamics, phase and structure formation mechanisms are explored, and the optimal conditions are outlined for reproducible C-f/in situ SiCnw dual reinforcement of SiC-based ceramics. Hot pressing at 1500 degrees C produced C-f/in situ SiCnw-reinforced ceramic SiC-TaSi2 specimens with a relative density of 97%, 19 GPa Vickers hardness, 3-point flexural strength sigma = 420 +/- 70 MPa and fracture toughness K-1C = 12.5 MPa m(1/2).
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