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Preparation of microspheres from an Alumina-Zirconia Sol

Abstract : A sol-gel process produced microsphere of Al2O3 containing 10 wt% ZrO2 by coprecipitating Al and Zr hydroxides from the respective chlorides through the addition of NH4OH. In this paper, gel processing is examined as a function of temperature, pH, and residual Cl- content. The washed gel was peptized at 80°C with HCl and the sol concentrated to an Al 3+ ion content of 4 mol/L. The concentrated sol is used to feed a pilot plant for microsphere production. The microspheres calcined at 1200°C are dense, with an average size of 20 µm and a BET surface area of 30 m2/g.
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Submitted on : Wednesday, January 6, 2010 - 11:09:44 AM
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  • HAL Id : emse-00444223, version 1


Laura Montanaro, Bernard Guilhot. Preparation of microspheres from an Alumina-Zirconia Sol. American Ceramic Society bulletin, American Ceramic Society, 1989, 68 (5), pp.1017-1020. ⟨emse-00444223⟩



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