Effect of silica sol on phase transition of alumina-mullite fibers |
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| Affiliation: | 1. National Key Laboratory of Science and Technology on High-strength Structural Materials, Central South University, Changsha 410083, China;2. Advanced Research Center, Central South University, Changsha 410083, China;1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, 430081 Wuhan, PR China;2. Yixing Morgan Thermal Ceramics Co., Ltd, 214222 Yixing, PR China;3. Guangdong Shanmo New Material Technology Co., Ltd, 526399 Zhaoqing, PR China;1. Technical University of Košice, Faculty of Materials, Metallurgy and Recycling, Institute of Metallurgy, Letná 9, 042 02, Košice, Slovakia;2. Institute of Materials Research - Slovak Academy of Sciences, Watsonova 47, 040 01, Košice, Slovakia;3. KERAG, s.r.o, Košice, Slovakia;1. College of Materials Science and Engineering, Xi''an University of Architecture and Technology, Xi''an, 710055, China;1. School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, PR China;2. Nanjing Totem Tool Co. Ltd, Nanjing 211215, PR China;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 |
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| Abstract: | Duplex oxide ceramic fibers have excellent high temperature properties. However, controlling the microstructure of duplex oxide ceramic fibers is difficult and complexed. In this work, the effect of silica sols affecting the interaction of precursor sol-gel particles on the high-temperature phase transition and microstructure of alumina-mullite fibers was investigated. The results show that the silica sol affects the particle interactions and distribution in the mixed sol. Alumina-mullite fibers prepared from non-homogeneous precursor sols generated α-Al2O3 at 1400 °C, while fibers prepared from homogeneous precursor sols required higher temperatures. In addition, mullite (3Al2O3:2SiO2) with an orthogonal structure is more likely to be generated in the non-homogeneous Al2O3-SiO2 precursor sol. The prepared alumina-mullite fibers have a tensile strength of up to 1.68 GPa. Finally, the mechanism of the influence of silica-sol properties on the final organization of the alumina-mullite fiber was further discussed. |
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| Keywords: | Alumina-mullite fibers Phase change Sol-gel Silica sol Biphase structure |
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