Preparation of Si3N4-BCxN-TiN composite ceramic aerogels via foam-gelcasting |
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| Affiliation: | 1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China;2. College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter EX4 4QF, UK;3. Henan Key Laboratory of High Temperature Functional Ceramics, Zhengzhou University, Zhengzhou 450052, China;1. School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, Anhui, China;2. National Key Laboratory of Science and Technology on Vacuum Technology & Physics, Lanzhou Institute of Physics, Lanzhou 730000, China;3. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China;1. School of Materials Science and Engineering, Nanjing Institute of Technology, Nanjing 211167, PR China;2. Institute of Intelligent Manufacturing Technology, Shenzhen Polytechnic, Shenzhen 518055, PR China;3. Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology, Nanjing 211167, PR China;4. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, PR China;5. School of Materials, Sun Yat-sen University, Guangzhou 510275, PR China;1. School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, PR China;2. State Key Laboratory of High Performance Ceramics and Super?ne Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, PR China;1. School of Physics, Liaoning University, Shenyang 110036, PR China;2. Songshan Lake Materials Laboratory, Dongguan 523808, PR China;3. Dongguan University of Technology, Dongguan 523808, PR China;4. Institute of Physics, Chinese Academy of Sciences, Beijing 100190, PR China;5. School of Physics, Peking University, Beijing 100190, PR China;1. College of Materials, Fujian Key Laboratory of Advanced Materials, Xiamen University, Xiamen 361005, China;2. Key Laboratory of High Performance Ceramic Fibers (Xiamen University), Ministry of Education, Xiamen 361005, China;3. State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou 350002, China |
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| Abstract: | Recently, high-performance ceramic aerogels (CAs) have become a research hotspot because of their multi-functional properties. Compared to their oxide counterparts, non-oxide CAs show better thermal shock resistance and other high-temperature properties, making them suitable for applications in harsh environments. In this work, Si3N4-BCxN-TiN ceramic aerogels (SBCNT CAs) with molar ratios of B/C/Si/Ti = 2:1:5:5 were synthesized at 1623 K for 3 h via foam-gelcasting, from Si, Ti, melamine and boron acid raw materials. The prepared SBCNT CAs containing 91.0% porosity exhibited the highest compressive strength up to 1.0 MPa, and thermal conductivity of 0.144 W/(m·K) at 298 K. They also exhibited excellent service performance at 1473 K in Ar, demonstrating their great potential for high-temperature applications. |
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| Keywords: | Ceramic aerogels Foam-gelcasting High-performance Non-oxide |
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