Title: Alum and Hydroxide Routes to ${\alpha}-Al_2O_3$ (II) Ultra-Fine Alumina by Thermal Decomposition
Abstract: In order to synthesize high-purity alpha alumina fine powder, the aluminum hydroxide and ammonium aluminum sulfate(alum) precursor were prepared from natural alumino-silicate(halloysite). The thermal decomposition mechenism for both precursors was elucidated by DTA/TG, XRD and IR analysis. The microstructure, specific surface area and purity of were characterized by SEM, and BET analysis. The particle size of was determined to be = 0.1∼0.5 m. However, the specific surface area for the alum derived (89.0 m/g) was extremely higher than that for the aluminum hydroxide derived one(7.3 m/g).
Publication Year: 1991
Publication Date: 1991-01-01
Language: en
Type: article
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Cited By Count: 1
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