Transparent polycrystalline alumina obtained by SPS: Green bodies processing effect |
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| Authors: | Lucile Lallemant Gilbert Fantozzi Vincent Garnier Guillaume Bonnefont |
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| Affiliation: | 1. Université de Lyon, CNRS, France;2. Insa-Lyon, MATEIS UMR5510, F-69621 Villeurbanne, France;1. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;2. Graduate University of the Chinese Academy of Sciences, Beijing 100049, China;3. Tokyo University of Agriculture and Technology, Tokyo 183-8538, Japan;1. Centro de Investigación en Nanomateriales y Nanotecnología (CINN), Principado de Asturias, Consejo Superior de Investigaciones Científicas (CSIC), Universidad de Oviedo (UO), Parque Tecnológico de Asturias, 33428 Llanera, Asturias, Spain;2. Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, S-10691 Stockholm, Sweden;1. CEITEC—Central European Institute of Technology, Brno University of Technology, Brno, Czech Republic;2. Joint Glass Centre of the IIC SAS, TnU AD, and FChFT STU, Tren?ín, Slovakia;1. Anhui Key Lab of Metal Materials and Processing, School of Materials Science and Engineering, Anhui University of Technology, 243002 Ma’anshan, People’s Republic of China;2. Division of Functional Materials and Nanodevices, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, 315201 Ningbo, People’s Republic of China;1. CEITEC BUT, Brno University of Technology, Purkynova 123, 612 00 Brno, Czech Republic;2. Joint Glass Centre of the IIC SAS, TnU AD, and FCHFPT STU, Studentska 2, 911 50 Trencin, Slovakia;3. CEITEC IPM, Institute of Physics of Materials, Academy of Sciences of the Czech Republic Zizkova 22, 616 62 Brno, Czech Republic;4. Institute of Materials Science and Engineering, Brno University of Technology, Technicka 2, 616 69 Brno, Czech Republic |
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| Abstract: | Starting from a commercial slurry of high purity α-Al2O3, freeze-dried powders, cast, filter-pressed or cold isostatically pressed samples were produced. Resulting powders or green bodies showing different particles packing were densified by spark plasma sintering (SPS) to obtain transparent polycrystalline α-Al2O3. Microstructure and real in-line transmittance (RIT) after SPS were dependent on the particles packing quality. Avoiding large agglomerates, narrowing the pore size distribution, reducing the most-frequent pore size (Dmode) and avoiding macroscopic heterogeneities within the green bodies enabled high RIT values to be achieved in the visible and near-infrared spectrum. However, a limit was achieved in the preparation of green bodies for which reducing the Dmode had no more influence on the optical behaviour of samples sintered by SPS. Finally, pure α-Al2O3 samples presenting a high RIT640 nm value of 53% were produced from all the green bodies obtained by the following techniques: filter-pressing, slip casting and cold isostatic pressing. |
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