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Sol–Gel Synthesis and Characterization of Alumina–Calcium Hexaaluminate Composites

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Boehmite sol was prepared by hot water hydrolysis of aluminum iso-propoxide using nitric acid as the catalyst. Calcium nitrate to yield 0–20 vol% calcia was added to the boehmite sol. The boehmite with additives was calcined at 600°C for 3 h. The calcined powder was milled at 230 rpm for 6 h and particle size was measured using Laser particle size analyzer. The powder samples were calcined at 1600°C for 3 h and the formation of calcium hexaaluminate was discussed using phase diagram, transmission electron microscope, energy dispersive spectra, and X-ray diffraction spectra. The powder samples calcined at 600°C for 3 h were compacted into cylindrical pellets and sintered at temperatures ranging from 1400° to 1600°C for 6 h and the formation of hexaaluminate (platelike) grains were confirmed using Scanning electron microscope and optical microscopy.
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Document Type: Research Article

Affiliations: 1: Department of Ceramic Technology, Anna University, Chennai 600 025, India 2: Department of Environmental and Materials Engineering, Nagoya Institute of Technology, Nagoya 466-8555, Japan

Publication date: May 1, 2005

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