Mullite ceramic foams with tunable pores from dual-phase sol nanoparticle-stabilized foams |
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| Affiliation: | 1. Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, China;2. State Key Lab of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China;3. School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing, 100083, China;1. Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, 610031, China;2. State Key Laboratory of Green Building Materials, China Building Materials Academy, Beijing, 100000, 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. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China;2. National-provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology, Wuhan University of Science and Technology, Wuhan 430081, China;1. School of Materials Science and Engineering, Shanghai University, Shanghai 200444, PR China;2. Key Laboratory of Transparent Opto-functional Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201899, PR China;3. Beijing Institute of Space Long March Vehicle, Beijing 100076, PR China;4. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, PR China |
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| Abstract: | Particle-stabilized foams employing dual-phase sol of boehmite in combination with silica to prepare mullite ceramic foams has been proposed for the first time. The obtained mullite ceramic foams possess hierarchical pores, that is micropores derived from the air bubble templates and open windows formed by grain growth at thin area of pore wall according to the mullitization reaction. Furthermore, nanoparticles favor the improvement of specific surface area of ceramic foams, and wrinkles caused by drying shrinkage would retain when sintering at low temperature of 900℃-1100℃, leading to high specific surface area of 94.4-219.2 m2/g. The achieved mullite ceramic foams present relatively high compressive strength of 6.6?40.4 MPa at a high open porosity of 64.0 %–87.0 %, and their thermal conductivity could reach as low as 0.10 W/(m·K), which would make them promising lightweight materials applied in broad fields including thermal insulations, filters, bio-scaffolds, catalyst supports and the like. |
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| Keywords: | Particle-stabilized foams Mullite ceramic foams Hierarchical pore Compressive strength |
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