The preparation and properties of high-strength porous mullite ceramics by a novel non-toxic gelcasting process |
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| Affiliation: | 1. School of Material Science and Engineering, Zhengzhou University, No.100 Science Avenue, Zhengzhou 450001, China;2. Henan Key Laboratory of High-Temperature Functional Ceramics, Zhengzhou University, 75 Daxue Road, Zhengzhou 450052, China;1. Guangxi Key Laboratory of Processing for Non–ferrous Metal and Featured Materials, Guangxi University, Nanning 530004, China;2. School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China;3. Centre of Excellence for Advanced Materials, Dongguan, China;1. CEITEC BUT, Brno University of Technology, Purkynova 123, Brno 61200, Czech Republic;2. Institute of Materials Science and Engineering, Brno University of Technology, Technicka 2, Brno 61669, Czech Republic;1. National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology, PR China;2. National Key Laboratory for Precision Hot Processing of Materials, Harbin Institute of Technology, China;3. Shenzhen STRONG Advanced Materials Research Institute Co., Ltd, PR China;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. National Key Laboratory of Advanced High Temperature Structural Materials, Beijing, 100095, China;3. College of Aeronautical Engineering, Civil Aviation University of China, Tianjin, 300300, China |
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| Abstract: | A novel approach to fabricate porous mullite ceramics with homogeneous pore size and high-strength using green non-toxic and cost-effective poly-γ-glutamic acid (γ-PGA) gelling system was reported for the first time. Effect of γ-PGA addition, additive amount and solid loading on rheological behavior of the slurries, and microstructure and properties of samples were investigated systematically. By optimizing the solid loading of mullite samples, we are able to get the sample with small pores (< 200 µm) dominating (93.3% of the total pores), and compressive strength of the sample reaches up to 26.62 MPa. In addition, the mullite ceramics exhibited high porosity of 75.7% with low thermal conductivity of 0.279 W/(m·K) at room temperature. This study not only provides a green and non-toxic gelling system but also offers porous mullite ceramics with low thermal conductivity and excellent mechanical strength as an energy-saving thermal insulation material. |
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| Keywords: | Foam-gelcasting method Porous mullite ceramics Thermal insulation |
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