Revisiting CA6 formation in cement-bonded alumina-spinel refractory castables
| Autor: | Victor C. Pandolfelli, A.P. Luz, Mariana A. L. Braulio, Eric Yoshimitsu Sako, A.G. Tomba Martinez |
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| Rok vydání: | 2017 |
| Předmět: |
Refractory castable
Work (thermodynamics) Reaction mechanism Recubrimientos y Películas Materials science Aluminate Alumina Cement Mineralogy INGENIERÍAS Y TECNOLOGÍAS 02 engineering and technology engineering.material Calcium hexaluminate 01 natural sciences chemistry.chemical_compound Ingeniería de los Materiales Phase (matter) 0103 physical sciences Materials Chemistry Chemical composition 010302 applied physics Spinel Metallurgy Atmospheric temperature range 021001 nanoscience & nanotechnology chemistry Ceramics and Composites engineering 0210 nano-technology |
| Zdroj: | Journal of the European Ceramic Society. 37:5023-5034 |
| ISSN: | 0955-2219 |
| DOI: | 10.1016/j.jeurceramsoc.2017.07.003 |
| Popis: | This work revisits the proposed mechanisms presented in the literature for CA6 formation in Al2O3-MgO and Al2O3-MgAl2O4 castables bonded with calcium aluminate cement. New experimental tests, thermodynamic simulations and re-evaluation of the chemical composition and microstructural aspects observed for samples fired in the temperature range of 1150°C to 1500°C were carried out. Based on these data, a new interpretation of the CA6 generation process, as well as the features which influence the location and morphology of this phase were proposed. CA6 formation via solid and liquid states are suggested to take place in all evaluated compositions, where the former (solid-state) is the main reaction predicted for the silica-free refractories (AM0MS and AS0MS), whereas the liquid-state one prevails in the AM1MS and AS1MS materials. The CA6 crystal morphology should be affected by these different reaction mechanisms. According to the experimental results, it was also discussed the role of the calcium hexaluminate features in the overall corrosion behavior of the designed refractories when they were placed in contact with molten slag at high temperatures. Such aspects have not been previously reported in published papers related to this subject. Fil: Tomba Martinez, Analia Gladys. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones en Ciencia y Tecnología de Materiales. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Instituto de Investigaciones en Ciencia y Tecnología de Materiales; Argentina Fil: Luz, A.P.. Universidade Federal do São Carlos; Brasil Fil: Braulio, M.A.L.. Universidade Federal do São Carlos; Brasil Fil: Sako, E.Y.. Saint-Gobain; Brasil Fil: Pandolfelli, V.C.. Universidade Federal do São Carlos; Brasil |
| Databáze: | OpenAIRE |
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