Multilayered mullite ceramics with anisotropic properties |
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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;3. School of Chemistry and Chemical Engineering, Henan University of Science and Technology, Luoyang, Henan 471023, China;4. China Tobacco Henan Industrial Co Ltd, Zhengzhou 450000, China;1. School of Materials Science and Engineering, State Key Laboratory of Silicon Materials, Key Laboratory of Novel Materials for Information Technology of Zhejiang Province, Zhejiang University, Hangzhou 310027, China;2. Institute of Advanced Magnetic Materials, College of Materials & Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310012, China;1. State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases, Department of Prosthodontics, School of Stomatology, The Fourth Military Medical University, Xi’an 710032, China;2. School of Science, Xi’an University of Posts and Telecommunications, 710061 Xi’an, China;3. The Institute of Scientific and Industrial Research, Osaka University, Japan;1. School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an, Shaanxi 710049, China;2. School of Textile Science and Engineering, Xi’an Polytechnic University, Xi’an, Shaanxi 710048, China;3. State Key Laboratory for Manufacturing System Engineering, Xi’an Jiaotong University, Xi’an, Shaanxi 710049, China;1. College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, China;2. Jiangsu Key Laboratory of Advanced Laser Materials and Devices, School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou 221116, China;3. Jiangsu Xiyi Advanced Materials Research Institute of Industrial Technology, Xuzhou 221400, China;4. Shanghai Institute of Optics Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China;5. Xuzhou Fuchang Electronic Technology Co., Ltd, Xuzhou 221116, China;6. Xuzhou Kangna Advanced Materials Technology Co., Ltd, Xuzhou 221400, China |
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| Abstract: | Anisotropic layered porous ceramics are crucial to satisfy the demand for devices with directional functions. However, challenges, such as complicated preparation processes and difficulties in regulating the oriented structure, severely limit their application. Here, multilayered mullite ceramics (MLMCs) with specific porosities and strongly anisotropy properties, were prepared by designing porous thin-layered units and an interlayer layout, in combination with a simple gel-casting. Benefiting from the suitable slurry properties, the samples did not show obvious defects, and a perfect bonding was observed between the layers. The optimized MLMCs exhibited a porosity of 65.12%, the differences in compressive and flexural strengths of 14 ( ± 0.7) and 5 ( ± 0.2) MPa in different pressure directions respectively, and the anisotropy factor of thermal conductivity up to 0.98, as well as exhibited good high temperature thermal insulation properties. Ultimately, the MLMCs formed transverse heat conductor and longitudinal heat insulation heat-transfer patterns, with promising applications in thermal insulation. |
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| Keywords: | Multilayered ceramics Anisotropic Thermal insulation Gel-casting Mullite |
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