In-situ synthesis of ultra-fine ZrB2–ZrC–SiC nanopowders by sol-gel method |
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| Affiliation: | 1. School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou 221116, China;2. School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, China;1. Institute of Physics, University of Tartu, Riia 142, 51014, Tartu, Estonia;2. Estonian Nanotechnology Competence Centre, Riia 142, 51014, Tartu, Estonia;3. Department of Materials Engineering, Tallinn University of Technology, Ehitajate 5, 19086, Tallinn, Estonia;4. ITMO University, Kronverksky 49, St. Petersburg, 197101, Russia;5. Department of Materials Science and Engineering, Aalto University, School of Chemical Technology, POB 16200, Aalto, 00076, Finland;1. School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China;2. Nano-Science & Technology Research Center, Shanghai University, Shanghai 200444, China;3. Laboratory for Microstructures, Shanghai University, Shanghai 200444, China;1. Henan Province Industrial Technology Research Institute of Resources and Materials, Zhengzhou University, Zhengzhou, 450001, China;2. School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, China;3. Zhengzhou Institute of Aeronautical Industry Management, Zhengzhou, 450015, China;4. Department of Materials and Engineering, University of Central Florida, Orlando, FL, 32826, USA;1. School of Material Science and Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, Shaanxi University of Science &Technology, Xi''an, Shaanxi, 710021, China;2. State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi''an Jiaotong University, Xi''an, Shaanxi, 710049, China;3. Gongyi Van-Re Yihui Composite Material CO., LTD, Gongyi, 451261, China;4. Advanced Materials Research Group, The University of Nottingham, Nottingham, NG7 2RD, UK;1. Nano-structured Materials Division, Central Metallurgical Research and Development Institute, CMRDI, P.O. Box: 87 Helwan, 11421 Helwan, Egypt;2. Ceramic and Refractory Materials Division, Central Metallurgical Research and Development Institute, CMRDI, P.O. Box: 87 Helwan, 11421 Helwan, Egypt |
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| Abstract: | ZrB2–ZrC–SiC nanopowders with uniform phase distribution were prepared from cost-effective ZrOCl2·8H2O by a simple sol-gel method. The synthesis route, ceramization mechanism and morphology evolution of the nanopowders were investigated. ZrB2–ZrC–SiC ceramic precursor can be successfully obtained through hydrolysis and condensation reactions between the raw materials. Pyrolysis of the precursor was completed at 650 °C, and it produced ZrO2, SiO2, B2O3 and amorphous carbon with a yield of 39% at 1300 °C. By heat-treated at 1500 °C for 2 h, highly crystallized ZrB2–ZrC–SiC ceramics with narrow size distribution were obtained. With the holding time of 2 h, both the crystal size and the particle size can be refined. Further prolonging the holding time can lead to serious particles coarsening. Studies on the microstructure evolution of the generated carbon during the ceramic conversion demonstrates the negative effect of the ceramic formation on the structure order improvement of the carbon, due to the large amount of defects generated in it by the boro/carbothermal reduction reactions. |
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| Keywords: | A Sol-gel C Nanopowder |
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