A new production method of submicron alumina powders

Autores: Contreras, C.A.|Satoshi Sugita|Ramos, E.|Torres, L.M.|Serrato, J.
Fuente: Azojomo: Journal of materials on-line [Consulta: 2006-08-31]

This paper describes a method for producing submicron high-purity alumina. In this method amorphous basic aluminum sulfate (BAS) was prepared by homogeneous precipitation of aluminum bisulfite solution containing chitosan. This cationic polymeric compound was used as an electrosteric dispersant. Submicron BAS was derived from an aluminum bisulfite solution (0.4 M in aluminum). The BAS powder was transformed into crystalline basic ammonium aluminum carbonate (ammonium dawsonite) by treating BAS with 1 M ammonium carbonate solution at 60°C for 4 h. Alpha alumina with mean particle size of 0.42 µm was obtained by heating ammonium dawsonite at 1150°C for 1 h.

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