Evolution of phase composition in the thermal decomposition of nanosized aluminum hydroxides
| Autor: | R. V. Tarasov, N.S. Poltavtsev, S. V. Gabelkov, Yu.P. Kurilo |
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| Rok vydání: | 2009 |
| Předmět: |
Boehmite
Materials science Inorganic chemistry Thermal decomposition Metals and Alloys Mixing (process engineering) chemistry.chemical_element Thermal treatment Condensed Matter Physics Decomposition Amorphous solid chemistry Mechanics of Materials Aluminium Phase composition Materials Chemistry Ceramics and Composites |
| Zdroj: | Powder Metallurgy and Metal Ceramics. 48:478-484 |
| ISSN: | 1573-9066 1068-1302 |
| DOI: | 10.1007/s11106-009-9139-2 |
| Popis: | The thermal decomposition of nanosized aluminum hydroxides, which are precipitated from solution in direct and inverse mixing of the chemical agents, is studied. The thermal treatment of hydroxides between 370 and 870 K results in their two-stage thermal decomposition. Intermediate decomposition products are amorphous aluminum oxyhydroxide AlO(OH)1+x and boehmite. Nanosized γ-Al2O3 begins forming even at 570 K. The thermal decomposition of amorphous oxyhydroxide AlO(OH)1+x ceases when amorphous alumina forms at 770–870 K. This results in powders representing a mixture of amorphous and γ-alumina. |
| Databáze: | OpenAIRE |
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