Aqueous tape casting of silicon nitride |
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| Affiliation: | 1. College of Physics, Sichuan University, Chengdu, 610064, China;2. Key Laboratory of Radiation Physics and Technology of Ministry of Education, Sichuan University, Chengdu, 610064, China;3. Key Laboratory of High Energy Density Physics of Ministry of Education, Sichuan University, Chengdu, 610064, China;1. Materials Science & Technology Division, CSIR-National Institute for Interdisciplinary Science & Technology, Industrial Estate P.O., Thiruvananthapuram, 695019, Kerala, India;2. Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India;1. State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;2. School of Materials Science and Engineering, Shanghai University, 99 Shangda Road, Shanghai 200444, China;3. Graduate University of the Chinese Academy of Sciences, Beijing 100049, China;1. Engineering Ceramics Research Group, Korea Institute of Materials Science, Changwon, Gyeongnam 51508, Republic of Korea;2. Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, UK;3. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, China;1. ISEM, Australian Institute of Innovative Materials, University of Wollongong, Wollongong, NSW, 2500, Australia;2. Defence Materials Technology Centre, 24 Wakefield Street, Hawthorn, VIC, 3122, Australia |
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| Abstract: | Slurries consisting of a low cost silicon nitride powder, sintering aids yttria and alumina, dispersants, binders, defoamers and water as a solvent were optimised for tape casting by electroacoustic and viscosity measurements and by casting experiments. The slurries exhibit shear-thinning behaviour due to the highly shear-thinning binder emulsion. Crack free tapes with a maximum thickness of approx. 250 μm and a binder content of 13–15 wt.% could be obtained. The green tapes with a high flexibility and green strength could be laminated easily by compression at room temperature. After sintering a dense microstructure developed. A significant shrinkage anisotropy parallel and perpendicular to the cast direction was observed. |
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