Microstructural evolution,mechanical and thermal properties of LaB6 embedded in Si-B-C-N prepared by spark plasma sintering |
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| Affiliation: | 1. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China;2. Institute for Advanced Ceramics, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150080, China;1. College of Materials Science and Engineering, Beijing University of Technology, Key Laboratory of Advanced Functional Materials, Ministry of Education, Beijing 100124, China;2. School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China;1. Solid State Physics Department, National Research Center, 12622 Dokki, Giza, Egypt;2. Electron Microscope and Thin Film Department, National Research Center, 12622 Dokki, Giza, Egypt;3. Materials Characterization Facility, Istituto Italiano di Tecnologia, via Morego 30, I-16163 Genova, Italy;1. Division of Materials Sciences and Engineering, US Department of Energy Ames Laboratory, Ames, IA 50011, USA;2. Department of Physics and Astronomy, Iowa State University, Ames, IA 50011, USA;3. Department of Materials Sciences and Engineering, Iowa State University, Ames, IA 50011, USA |
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| Abstract: | Si-B-C-N monoliths with 5 wt% LaB6 additives were prepared by spark plasma sintering at 1250–2000 °C and 50 MPa using a mechanically alloyed mixture of graphite, c-Si, h-BN and LaB6 powders as the starting materials. Microstructural evolution, mechanical and thermal properties of the as-prepared La/Si-B-C-N monoliths were investigated. The densification of the ceramics starts at 1160° and ends at 1800 °C with the formation of La-containing compounds coupled with SiC and BN(C) phases. La-containing BN(C) grains develop into a lamellar structure at 1900 °C offering improved fracture toughness and decreased Vickers hardness, flexural strength and elastic modulus. The formation of lamellar BN(C) is also responsible for a high thermal expansion coefficient of 4.2×10?6 /°C. |
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| Keywords: | A Sintering B Microstructure C Mechanical properties C Thermal expansion |
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