| Full text | |
| Author(s): |
Total Authors: 2
|
| Affiliation: | [1] Univ Sao Paulo, Sao Carlos Sch Engn, Dept Mat Engn, Sao Carlos, SP - Brazil
Total Affiliations: 1
|
| Document type: | Journal article |
| Source: | Journal of the European Ceramic Society; v. 36, n. 3, p. 885-897, FEB 2016. |
| Web of Science Citations: | 7 |
| Abstract | |
The combination of Al2O3 and Al(OH)(3) produces high refractoriness porous structures. The evolution of these ceramics during the first heating is a competition between pore generation by Al(OH)(3) dehydroxilation, and densification by sintering. Previous studies have reported the size of Al(OH)(3) particles affect both events. In this study, we evaluate the porogenic behavior of three grades of ce-Al(OH)(3) (gibbsite) of different average particle sizes (0.9,10 and, 107 mu m). The particles were thermally treated (300-1500 degrees C) for the investigation of changes in their physical properties and microstructures. Amounts of 67.5 vol% of each grade were added to aqueous castable alumina suspensions. After rheological tests and casting, the sintered samples (1100-1500 degrees C) were tested for porosity, pore size, and strength and examined by electron microscopy. The particles of the three grades exhibited similar evolution during thermal treatment. When they were added to the alumina matrix, structures of different porosity and strength were obtained. (C) 2015 Elsevier Ltd. All rights reserved. (AU) | |
| FAPESP's process: | 10/19274-5 - Novel methodology for hydrotalcite (Mg6Al2(OH)16CO3.4H2O) synthesis from aqueous suspensions of magnesium oxide (MgO) and aluminum hydroxide (Al(OH)3) and its application in porous ceramics for high temperature thermal insulation |
| Grantee: | Rafael Salomão |
| Support Opportunities: | Research Grants - Young Investigators Grants |