Effect of starch filler content and sintering temperature on the processing of porous 3Y–ZrO2 ceramics |
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| Authors: | L.B. Garrido M.P. Albano K.P. Plucknett L. Genova |
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| Affiliation: | 1. CETMIC Centro de Tecnología de Recursos Minerales y Cerámica (CIC-CONICET-UNLP), Cam. Centenario y 506, C.C.49 (B 1897 ZCA) M.B. Gonnet, Buenos Aires, Argentina;2. Department of Process Engineering and Applied Science, Dalhousie University, 1360 Barrington Street, Halifax, Nova Scotia, B3J 1Z1 Canada;3. IPEN Instituto de Pesquisas Energéticas e Nucleares, CCTM Centro de Ciência e Technologia de Materiais, Cidade Universitária, Travessa R 400, 05508-900 São Paulo, Brazil;1. Department of Materials Engineering, Faculty of Mechanical Engineering, University of Tabriz, Tabriz, Iran;2. School of Materials and Metallurgy Engineering, Iran University of Science and Technology, Tehran, Iran;3. Young Researchers and Elite Club, Khorramabad Branch, Islamic Azad University, Khorramabad, Iran;4. Department of Mechanical Engineering, University of Mohaghegh Ardabili, Ardabil, Iran;1. Institute of Stomatology, School and Hospital of Stomatology, Wenzhou Medical University, Wenzhou 325027, PR China;2. Department of Prosthodontics, School and Hospital of Stomatology, Wenzhou Medical University, Wenzhou 325027, PR China;1. School of Applied Physics, Faculty of Science and Technology, National University of Malaysia (UKM), 43600 UKM, Bangi, Selangor, Malaysia;2. Dept. of Mechanical & Materials Engineering, Faculty of Engineering & Built Environment, National University of Malaysia (UKM), 43600 UKM, Bangi, Selangor, Malaysia;1. College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China;2. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology(WUST), Wuhan 430081, China |
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| Abstract: | A direct casting process was used to produce porous 3Y–ZrO2 ceramics using starch as a fugitive filler and binder. The compositions with low additions of starch had higher porosity than the volume fraction of starch initially in the green body (Xst), whereas, the compositions with high amounts of starch produced lower porosity than the predicted value. The well ordered structure consisted of spherical pores of 8–10 μm diameter, retained from the original starch particles, connected by channels. The interconnection between pores was dependent on the volume fraction of starch incorporated, as well as on the sintering temperature. Pore interconnection was observed for all the compositions sintered at 1000–1300 °C. Increasing the sintering temperature to 1400–1500 °C produced a marked dependence of the open to total porosity ratio on Xst. For a high porosity material, a bimodal channel size distribution was found at 1400 and 1500 °C. The primary pore channel diameter was 0.7 μm and the secondary one was close to 4 μm. As the sintering temperature increased, the volume of the connecting channels decreased; at 1500 °C only a minor volume of the larger channels was found. |
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