Mullite compacts obtained by colloidal filtration of alumina powders dispersed in colloidal silica suspensions
| Autor: | Rodrigo Moreno, Olga Burgos-Montes, M.I. Nieto |
|---|---|
| Rok vydání: | 2007 |
| Předmět: |
Thixotropy
Materials science Process Chemistry and Technology Colloidal silica technology industry and agriculture Sintering Mullite Aluminium silicate equipment and supplies Ceramic matrix composite Shaping Surfaces Coatings and Films Electronic Optical and Magnetic Materials Colloid chemistry.chemical_compound Suspensions Rheology chemistry Materials Chemistry Ceramics and Composites Composite material |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| ISSN: | 0272-8842 |
| Popis: | This work deals with the manufacture of mullite-matrix composites by a colloidal filtration route. Avariation of the transient viscous sintering process is studied in which submicrometer sized alumina particles are dispersed in a nanosize colloidal silica suspension. High solids loading suspensions (45 and 50 vol.%) are prepared by ultrasonic mixing and dispersed with citric acid. Rheological optimisation allows to obtain low viscosities and to reduce thixotropy and ageing effects. Specimens are obtained by slip casting and sintered to 1550 8C/2 h by using different heating cycles, the best results being obtained with a plateau after the maximum rate of sintering where reaction occurs. # 2005 Elsevier Ltd and Techna Group S.r.l. All rights reserved. |
| Databáze: | OpenAIRE |
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