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Preparation of plate-like α-Al2O3 particles in Na2SO4 flux using kaolin as the starting material

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Plate-like α-Al2O3 particles are used to reinforce metal or ceramics to improve their mechanical properties. Here, we have demonstrated the production of alumina platelets using kaolin as a raw material in a sodium sulphate flux. When kaolin was sintered using Na2SO4 flux, the main phase formed in samples sintered at 900°C was mullite, but alumina was produced at 1000°C. Sintering at 1200°C led to alumina and sodium aluminosilicate, with little of the mullite phase present. Plate-like α-Al2O3 particles were observed in samples sintered at 1200°C, with diameters ranging from 1.5 to 4.5 m and thicknesses from 0.05 to 0.1 m. This production method is economically feasible because the raw materials have a low cost and the sintering temperature is low.
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Keywords: COMPOSITE REINFORCEMENT; KAOLIN; MOLTEN SALT; PLATE-LIKE ALPHA-AL2O3; PREPARATION OF ALUMINA

Document Type: Research Article

Publication date: 2010-12-01

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