Combustion synthesis of SiC-based ceramics reinforced by discrete carbon fibers with in situ grown SiC nanowires |
| |
| Affiliation: | 1. State Key Laboratory of Solidification Processing, Carbon/carbon Composites Research Center, Northwestern Polytechnical University, Xi’an 710072, China;2. Shenzhen Research Institute of Northwestern Polytechnical University, Shenzhen 518057, China;1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;2. The 13th Institute of No.9 Academy, China Aerospace Science and Technology Corporation, Beijing 100845, China;3. Northwest Institute of Nuclear Technology, Xi''an 710024, China;4. Department of Chemical Engineering, COMSATS Institute of Information Technology, M.A. Jinnah Building, Defence Road, Off Raiwind Road, Lahore 54000, Pakistan;1. Department of Materials Engineering, College of Materials and Textile, Zhejiang Sci-Tech University, Hangzhou 310018, PR China;2. Multi-disciplinary Materials Research Center, Frontier Institute of Science and Technology, Xi''an Jiaotong University, Xi''an 710049, China;3. Intelligent Polymer Research Institute, University of Wollongong, Wollongong, NSW 2522, Australia;1. College of Materials Science and Engineering, Hunan University, Changsha 410082, PR China;2. College of Metallurgy and Material Engineering, Hunan University of Technology, Zhuzhou 412007, PR China |
| |
| Abstract: | 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 (Cf) 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 μm length. Thermodynamics, phase and structure formation mechanisms are explored, and the optimal conditions are outlined for reproducible Cf/in situ SiCnw dual reinforcement of SiC-based ceramics. Hot pressing at 1500 °C produced Cf/in situ SiCnw-reinforced ceramic SiC–TaSi2 specimens with a relative density of 97%, 19 GPa Vickers hardness, 3-point flexural strength σ = 420 ± 70 MPa and fracture toughness K1C = 12.5 MPa m1/2. |
| |
| Keywords: | SiC Nanowires Combustion synthesis TaSi2 Carbon fibers Ceramic-matrix composites |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
