High-strength thermal insulating mullite nanofibrous porous ceramics |
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| Affiliation: | 1. School of Materials Science and Engineering, Key Lab of Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin University, Tianjin, 300072, China;2. Aerospace Business Department, China Academy of Launch Vehicle Technology, Beijing, 100076, China;3. College of Aeronautical Engineering, Civil Aviation University of China, Tianjin 300300, China;1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China;2. School of Materials Science and Engineering, Anhui University of Technology, Ma’anshan 243002, China;3. College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter EX4 4QF, UK;1. National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin 150080, PR China;2. Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150080, PR China;1. School of High Temperature Materials and Magnesium Resource Engineering, University of Science and Technology Liaoning, Anshan 114051, China;2. Ningbo Institute of Industrial Technology, Chinese Academy of Science, Ningbo 315201, China;1. College of Aeronautical Engineering, Civil Aviation University of China, Tianjin 300300, China;2. School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore;3. School of Materials Science and Engineering of Tianjin University, Key Lab of Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin 300072, China |
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| Abstract: | Mullite fibrous porous ceramics is one of the most commonly used high temperature insulation materials. However, how to improve the strength of the mullite fibrous porous ceramics dramatically under the premise of no sacrificing the low sample density has always been a difficult scientific problem. In this study, the strategy of using mullite nanofibers to replace the mullite micron-fibers was proposed to fabricate the mullite nanofibrous porous ceramics by the gel-casting method. Results show that mullite nanofibrous porous ceramics present a much higher compressive strength (0.837 MPa) than that of mullite micron-fibrous porous ceramics (0.515 MPa) even when the density of the mullite nanofibrous porous ceramics (0.202 g/cm3) is only around three quarters of that of the mullite micron-fibrous porous ceramics (0.266 g/cm3). The obtained materials that present the best combination of mechanical and thermal properties can be regarded as potential high-temperature thermal insulators in various thermal protection systems. |
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| Keywords: | Mullite fiber Porous ceramics Thermal insulation materials |
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