Microstructure and densification of ZrB2–SiC composites prepared by spark plasma sintering |
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| Authors: | Ipek Akin Mikinori Hotta Filiz Cinar Sahin Onuralp Yucel Gultekin Goller Takashi Goto |
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| Affiliation: | 1. Istanbul Technical University, Metallurgical and Materials Engineering Department, 34469 Maslak, Istanbul, Turkey;2. Tohoku University, Institute for Materials Research, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan;1. Young Researchers and Elite Club, Miyaneh Branch, Islamic Azad University, Miyaneh, Iran;2. Young Researchers and Elite Club, Central Tehran Branch, Islamic Azad University, Tehran, Iran;3. Department of Mechanical Engineering, University of Mohaghegh Ardabili, Ardabil, Iran;4. Department of Materials Science and Engineering, University of Tabriz, Tabriz, Iran;5. Department of Mechanical Engineering, Quchan Branch, Islamic Azad University, Quchan, Iran;1. Department of Mechanical Engineering, University of Mohaghegh Ardabili, Ardabil, Iran;2. Department of Mining and Metallurgy Engineering, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran;3. Ceramic Department, Materials and Energy Research Center (MERC), Karaj, Iran;4. Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul National University, Seoul 08826, Republic of Korea;1. National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin, 150001, PR China;2. China Academy of Launch Vehicle Technology, Beijing, 100000, PR China |
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| Abstract: | ZrB2–SiC composites were prepared by spark plasma sintering (SPS) at temperatures of 1800–2100 °C for 180–300 s under a pressure of 20 MPa and at higher temperatures of above 2100 °C without a holding time under 10 MPa. Densification, microstructure and mechanical properties of ZrB2–SiC composites were investigated. Fully dense ZrB2–SiC composites containing 20–60 mass% SiC with a relative density of more than 99% were obtained at 2000 and 2100 °C for 180 s. Below 2120 °C, microstructures consisted of equiaxed ZrB2 grains with a size of 2–5 μm and α-SiC grains with a size of 2–4 μm. Morphological change from equiaxed to elongated α-SiC grains was observed at higher temperatures. Vickers hardness of ZrB2–SiC composites increased with increasing sintering temperature and SiC content up to 60 mass%, and ZrB2–SiC composite containing 60 mass% SiC sintered at 2100 °C for 180 s had the highest value of 26.8 GPa. The highest fracture toughness was observed for ZrB2–SiC composites containing 50 mass% SiC independent of sintering temperatures. |
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