Phase Transition Activity Characteristics of Nanosized AlOOH in the Hydrothermal Synthesis of Nanosized α-Al2O3
| Autor: | Lian Xiao Huang, Lianmeng Zhang, Bo Lin Wu, Hai Da Liao, Yan Bin Meng |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
Boehmite
Materials science Mechanical Engineering Mineralogy Aluminum Carbonate Chemical synthesis Hydrothermal circulation law.invention Crystal chemistry.chemical_compound Chemical engineering chemistry Mechanics of Materials law Hydrothermal synthesis Hydroxide General Materials Science Calcination |
| Zdroj: | Key Engineering Materials. :675-678 |
| ISSN: | 1662-9795 |
| DOI: | 10.4028/www.scientific.net/kem.368-372.675 |
| Popis: | α-Al2O3 nanopowders were prepared by a novel synthesis process, using the nanosized α-Al2O3 obtained from pyrolyzing ammonium aluminum carbonate hydroxide as seeds and the self-dispersed nanosized AlOOH crystal powders as precursors. Based on their good self-dispersion in water, the α-Al2O3 seeds were dispersed evenly into the AlOOH sol by the new homodispersion mixing technique. This process enables the conversion of AlOOH to alumina at 190°C (hydrothermal temperature), in which the alumina is calcined to nanosized alpha-alumina having an average length to diameter ratio of 60nm:15nm at 930°C. In the synthesis reaction for transforming the AlOOH to alumina, the effect of superfine pulverization and self-dispersion of the precursors was studied. |
| Databáze: | OpenAIRE |
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