Effects of post-sintering annealing on the microstructure and toughness of hot-pressed SiCf/SiC composites with Al2O3-Y2O3 additions |
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| Affiliation: | 1. Refarctory & Ceramic Materials Division (RCMD), Central Metallurgical R&D Institute (CMRDI), Cairo, Egypt;2. Functional Nanosystems and High-Temperature Materials Department, National University of Science and Technologies “MISiS”, Leninskiy Pr. 4, 119049, Moscow, Russia;3. Inorganic and Physical Chemistry, Chemistry Department, Faculty of Science, AinShams University, Cairo, Egypt;4. German Aerospace Center – Linder Höhe, 51147, Köln, Germany;1. Centre for Advanced Structural Ceramics, Department of Materials, Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom;2. Université de Lyon, INSA Lyon – Université Claude Bernard Lyon 1, MATEIS, UMR CNRS 5510, 69621 Villeurbanne Cedex, France;1. Non-Metallic Materials Research Group, Niroo Research Institute (NRI), Tehran, Iran;2. Department of Materials Science and Engineering, Faculty of Engineering, Imam Khomeini International University, Qazvin, Iran;1. Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan;2. Department of Physics, Faculty of Science, King Mongut’s Institute of Technology Ladkrabang (KMITL), Chalongkrung Road, Ladkrabang, Bangkok 10520, Thailand;3. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 122 Luoshi Road, Wuhan, China |
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| Abstract: | This study examined the effects of post-sintering heat treatment on enhancing the toughness of SiCf/SiC composites. Commercially available Tyranno® SiC fabrics with contiguous dual ‘PyC (inner)-SiC (outer)’ coatings deposited on the SiC fibers were infiltrated with a SiC + 10 wt% Al2O3-Y2O3 slurry by electrophoretic deposition. SiC green tapes were stacked between the slurry-infiltrated fabrics to control the matrix volume fraction. Densification of approximately 94% ρtheo was achieved by hot pressing at 1750 °C, 20 MPa for 2 h in an Ar atmosphere. Sintered composites were then subjected to isothermal annealing treatment at 1100, 1250, 1350, and 1750 °C for 5 h in Ar. The correlation between the flexural behavior and microstructure was explained in terms of the in situ-toughened matrix, phase evolution in the sintering additive, role of dual interphases and observed fracture mechanisms. Extensive fractography analysis revealed interfacial debonding at the hybrid interfaces and matrix cracking as the key fracture modes, which were responsible for the toughening behavior in the annealed SiCf/SiC composites. |
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| Keywords: | Ceramic matrix composites SiC Flexural strength Toughness and toughening |
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