High strength porous alumina by spark plasma sintering |
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| Authors: | Dibyendu Chakravarty Hayagreev Ramesh Tata N Rao |
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| Affiliation: | 1. International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI), Balapur P.O., Hyderabad 500005, Andhra Pradesh, India;2. Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai 600036, Tamil Nadu, India;1. Central Glass & Ceramic Research Institute, Council of Scientific and Industrial Research, Kolkata 700032, India;2. Department of Physics, Bengal Engineering & Science University, Howrah 711103, India;3. Institute for Plasma Research, Gandhinagar 302428, India;1. Institute of Processing and Application of Inorganic Materials (PAIM), Hanseo University, # 360, Seosan-si 356-706, Chungnam, Republic of Korea;2. Institute of Ceramics, Glass and Construction Materials, Freiberg University, Agricolastrasse 17, 09599 Freiberg, Germany;1. Université de Toulouse, Institut Carnot CIRIMAT, UMR 5085 CNRS – Université Toulouse III Paul-Sabatier – INPT, 118 route de Narbonne, 31062 Toulouse Cedex 9, France;2. CEMES, CNRS UPR 8011 and Université de Toulouse, 29 rue Jeanne Marvig, 31055 Toulouse, France;3. CNRS, Institut Carnot CIRIMAT, 118 route de Narbonne, 31602 Toulouse Cedex 9, France;1. Science and Technology on Advanced Composites in Special Environments Laboratory, Harbin Institute of Technology, Harbin 150001, PR China;2. State Key Laboratory for Turbulence and Complex Systems, College of Engineering, Peking University, Beijing 100871, PR China |
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| Abstract: | High strength porous alumina was fabricated by spark plasma sintering (SPS) at temperatures between 1000 and 1200 °C with nanocrystalline Al(OH)3 as the starting powder without any seeds, dopants or inclusions. Decomposition of the Al(OH)3 produced a series of transitional alumina phases depending on sintering temperature and pressure and finally the stable α-alumina phase was obtained. A network of continuous pores with unimodal pore size distribution was estimated by mercury porosimetry and BET surface area measurements, with the porosity ranging between 20% and 60% based on sintering conditions. Predominance of fine grains and extensive necking between them led to better strength in the sintered samples. The bending strength of the sintered compacts rapidly increased with sintering temperature while retaining reasonable porosity suitable for practical applications. The results clearly indicate that in situ phase formation of α-Al2O3 and θ-Al2O3 provides strength and porosity, respectively. Phase transformation, pore morphology and microstructure evolution were also studied. |
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