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Mechanical properties of nano-grain SiO2 glass prepared by spark plasma sintering
Affiliation:1. Key Laboratory of Fiber Optic Sensing Technology and Information Processing, Ministry of Education, Wuhan University of Technology, Wuhan 430070, PR China;2. Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan;1. Graduate School of Materials Science, Nara Institute of Science and Technology (NAIST), 8916-5 Takayama, Ikoma, Nara 630-0192, Japan;2. Tokuyama Corporation, 1-1 Mikage-cho, Shunan-shi, Yamaguchi 745-8648, Japan;1. Institute of Physics of Materials, Academy of Sciences of the Czech Republic, CEITEC IPM, ?i?kova 22, Brno, Czech Republic;2. Institute of Materials Research, Slovak Academy of Sciences, Watsonova 47, Ko?ice, Slovak Republic;3. Materials Research Institute, Queen Mary University of London, Mile End Road, London E1 4NS, United Kingdom;4. Nanoforce Technology Limited, Queen Mary University of London, London E1 4NS, United Kingdom;1. Key Laboratory of Ministry of Education for Advanced Materials in Tropical Island Resources, School of Materials and Chemical Engineering, Hainan University, 58 Renming Ave, Haikou 570228, China;2. School of Materials Science and Engineering, Donghua University, 160 North Renming Road, Songjiang District, Shanghai 200257, China;1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China;2. National-Provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology, China;3. Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China;4. Guangdong Institute of Materials and Processing, Guangdong Academy of Sciences, Guangzhou, Guangdong 510650, China;5. National Engineering Research Center of Powder Metallurgy of Titanium&Rare Metals, Guangdong Academy of Sciences, Guangzhou, Guangdong 510650, China
Abstract:Silicon carbide (SiC) layers were deposited on silica (SiO2) glass powder by rotary chemical vapor deposition (RCVD) to form SiO2 glass (core)/SiC (shell) powder; this powder was consolidated by spark plasma sintering (SPS). SiO2 glass powder with a particle size of 250 nm was coated with 5–10-nm-thick SiC layers. The resultant SiO2 glass (core)/SiC (shell) powder was consolidated to form a nano-grain SiO2 glass composite at a relative density above 90% by SPS in the sintering temperature range of 1573–1823 K. The Vickers hardness and fracture toughness of the SiO2 glass composite at 1723 K were found to be 14.2 GPa and 5.4 MPa m1/2, respectively.
Keywords:Rotary chemical vapor deposition  Spark plasma sintering  High hardness  High fracture toughness
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