Separation of CNF agglomerates from a ceramic suspension by spray drying technique |
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| Affiliation: | 1. Empa, Swiss Federal Laboratories for Materials Testing and Research, Laboratory for High Performance Ceramics, Ueberlandstrasse 129, Duebendorf, 8600 Switzerland;2. Slovak Academy of Sciences, Institute of Inorganic Chemistry, Dubravska Cesta 9, Bratislava, 845 36 Slovakia;3. Vitrum Laugaricio – Joint Glass Center of the Institute of Inorganic Chemistry SAS, Alexander Dubček University of Trenčín, and Faculty of Chemical and Food Technology, Slovak University of Technology, Śtudentská 2, Trenčín, 911 50 Slovakia;1. National Institute for Laser, Plasma and Radiation Physics, ECS Laboratory, 077125, Magurele, Bucharest, Romania;2. University of Bucharest, Faculty of Physics, Bucharest, Romania;1. SPCTS, ENSCI, 12 rue Atlantis, 87068 Limoges Cedex, France;2. Université de Limoges, GRESE EA 4330, 123 avenue Albert Thomas, 87060 Limoges, France;3. Université de Limoges, SPCTS, 12 rue Atlantis, 87068 Limoges Cedex, France;1. College of Electronics and Information Science, Fujian Jiangxia University, Fuzhou, Fujian 350108, PR China;2. State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, CAS, Fuzhou, Fujian 350002, PR China;1. College of Materials Science and Engineering, China Jiliang University, Hangzhou 310018, PR China;2. College of Mathematics, Physics and Information Engineering, Zhejiang Normal University, Jinhua, Zhejiang 321004, PR China;3. Institute of Optoelectronic Technology, China Jiliang University, Hangzhou 310018, PR China;1. School of Materials Science and Engineering, University of Jinan, Jinan, Shandong 250022, China;2. Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Materials and Metallurgy, Northeastern University, Shenyang, Liaoning 110819, China;3. Advanced Materials Processing Unit, National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan |
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| Abstract: | Aqueous silicon nitride based composite suspensions with the addition of 3.1 wt% of carbon nano-fibers (CNFs) were dried using two different drying techniques: spray drying and freeze drying. The paper deals with optimisation of parameters of the spray drying processwith the aim of maximising the yield and improve the quality of the granulate. Freeze drying was selected as a reference drying method, because no powder separation can occur in the course of the process. Prepared suspensions were spray dried at 4 different temperatures: 80, 110, 140 and 180 °C. After each run, two types of granules were obtained: from the separation flask and from the product vessel. Thermo-gravimetric analysis together with SEM examination show that spray drying results in separation of CNFs agglomerates. The granules from separation flask are always enriched by CNFs agglomerates whilst the granules from product vessel have reduced content of CNFs agglomerates. Sintering of spray-dried granules from the product vessel resulted in the composite with uniform microstructure, low amount of CNFs agglomerates and high relative density. |
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| Keywords: | Carbon nano - fibers Suspension Spray drying Freeze drying Sintering |
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