Al2O3-based binders for corrosion resistance optimization of Al2O3–MgAl2O4 and Al2O3–MgO refractory castables
| Autor: | A.G. Tomba Martinez, Mariana A. L. Braulio, A.P. Luz, Victor C. Pandolfelli |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Materials science
Silica fume Físico-Química Ciencia de los Polímeros Electroquímica Sintering INGENIERÍAS Y TECNOLOGÍAS engineering.material Corrosion Ingeniería de los Materiales Specific surface area CASTABLE Materials Chemistry Process Chemistry and Technology Metallurgy Spinel Ciencias Químicas Slag CORROSION Cerámicos Microstructure Grain size Surfaces Coatings and Films Electronic Optical and Magnetic Materials SPINEL visual_art Ceramics and Composites engineering visual_art.visual_art_medium THERMODYNAMIC SIMULATION CIENCIAS NATURALES Y EXACTAS |
| Zdroj: | Ceramics International. 41:9947-9956 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2015.04.074 |
| Popis: | This work addresses the main aspects related to the use of alternative binders [hydratable (HA) or colloidal alumina (ColAlu)] in castables containing different spinel sources (pre-formed or in situ generated), in order to point out: (i) the features that control the corrosion behavior of these materials, and (ii) the key factors to better select a refractory composition. Thermodynamic calculations, corrosion cup-test and SEM analyses were carried out in order to evaluate the slag attack of the designed refractory compositions. According to the attained results, the alumina-based binders (HA or ColAlu) induced a more effective sintering process due to their high specific surface area, improving the physical properties and the binding level of the generated microstructure. The spinel grain size also played an important role in the corrosion behavior of these refractories, as the finer the particles, the greater their dissolution was into the molten liquid, leading to further precipitation of spinel in the solid-liquid interface as a continuous and thick layer. Among the evaluated compositions and considering the presence of silica fume, the most suitable formulation with optimized corrosion resistance was the one with in situ spinel generation and HA as a binder. Fil: Tomba Martinez, Analia Gladys. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Mar del Plata. Instituto de Investigación en Ciencia y Tecnología de Materiales (i); Argentina Fil: Luz, A.P.. Federal University of São Carlos. Materials Engineering Department; Brasil Fil: Braulio, M. A. L.. Universidad Nacional de Mar del Plata. Facultad de Ingenieria; Argentina Fil: Pandolfelli, V.C.. Federal University of São Carlos. Materials Engineering Department; Brasil |
| Databáze: | OpenAIRE |
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