Effect of powder,binder and process parameters on anisotropic shrinkage in tape cast ceramic products |
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| Authors: | Andreas Heunisch Armin Dellert Andreas Roosen |
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| Affiliation: | 1. Key Laboratory of Transparent Opto-functional Advanced Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, PR China;2. University of Chinese Academy of Sciences, Beijing 100039, PR China;3. School of Materials Science and Engineering, Qiqihar University, Qiqihar 161006, PR China;4. School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, PR China;1. Department of Chemical Engineering and Food Engineering (EQA), Federal University of Santa Catarina (UFSC), 88040-900, Florianópolis, SC, Brazil;2. Department of Mechanical Engineering (EMC), Federal University of Santa Catarina (UFSC), 88040-900, Florianópolis, SC, Brazil;1. CEITEC BUT, Brno University of Technology, Purkynova 123, 61669 Brno, Czech Republic;2. Institute of Materials Science and Engineering, Brno University of Technology, Technicka 2896/2, 61669 Brno, Czech Republic;3. CEITEC IPM, Institute of Physics of Materials, Academy of Sciences of the Czech Republic, Zizkova 513/22, 61662 Brno, Czech Republic;1. Key Laboratory of Multi-Spectral Absorbing Materials and Structures of Ministry of Education, University of Electronic Science and Technology of China, China;2. School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, 610054, China |
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| Abstract: | The effect of powder, binder and process parameters on the properties of cast alumina tapes and their anisotropic shrinkage were investigated. Three alumina powders with different particle shapes (platelets, spherical, standard) and three PVB binders with different chain lengths were used. In addition, casting velocity and blade gap height were varied. The orientation of the particles in the tape was detected quantitatively by image analysis of micrographs. The shrinkage anisotropy is more than 12% for the platelet shaped powder and 8% for the standard powder, whereas the spherical particles lead to almost isotropic shrinkage. The influence of the organic binder chain length proved to be minor compared to the influence of the particle morphology. The variation of casting speed and blade gap height has no effect on anisotropic shrinkage in the investigated parameter range. This is explained by theoretical considerations of particle rotation in a sheared fluid. |
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