Role of powder properties and shaping techniques on the formation of pore-free YAG materials |
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| Authors: | Laura Esposito Andreana Piancastelli |
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| Affiliation: | 1. IPN, CICATA Altamira, Altamira, Tamaulipas 89600, Mexico;2. TECNO-INSPEC S.A. de C.V., Tampico, Tamaulipas 89260, Mexico;3. Institute of Materials Science and Technology (IMRE), Havana University, Havana 10400, Cuba;1. Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), Northeastern University, Shenyang, Liaoning 110819, China;2. Advanced Materials Processing Unit, National Institute for Materials Science, Sengen 1-2-1, Tsukuba, Ibaraki 305-0044, Japan;3. State Key Laboratory of Crystal Materials, Shandong University, Jinan, Shandong 250100, China;1. Engineering Ceramics Research Group, Korea Institute of Materials Science, 797 Changwondaero, Changwon, Gyeongnam 51508, Republic of Korea;2. Agency for Defence Development, 488 Bugyuseongdaero, Yuseong, Daejeon 34186, Republic of Korea;1. Department of Physics, Goa University, Taleigao Plateau, Goa 403 206, India;2. Solid State Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India;1. Department of Materials Engineering, Ben-Gurion University of the Negev, P.O.B 653, Beer-Sheva, 84105, Israel;2. Department of Materials Science & Engineering, Drexel University, Philadelphia, PA, 19104, USA |
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| Abstract: | A key feature of transparent ceramics is the absence of residual porosity because boundary between pores and ceramic grains is the origin for light scattering. Powders characterized by a grain size in the nanometric range are generally adopted for obtaining transparent ceramics because of their superior reactivity, but the formation of undesired secondary phase related to the presence of impurities, is observed. The present study shows the results obtained with alternative, highly pure, micrometric powders with two shaping techniques, cold isostatic pressing (CIP) and slip casting (SC). The powder treatment and shaping process are easier when coarser powders are adopted. The influence of the powder properties and of the dispersant system on the particle packing, on the density and on the porosity are studied in relation to the two shaping techniques. The role of the aforementioned features on the final microstructure and on the optical properties are also discussed. |
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