Quaternary System Al2O3–CaO–MgO–SiO2: II Study of the Crystallization Volume of MgAl2O4 |
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Authors: | Bertha Alicia Vázquez Ángel Caballero Pilar Pena |
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Affiliation: | Universidad Autónoma de Nuevo León–Monterrey, Nuevo León, México; Instituto de Cerámica y Vidrio, CSIC, 28049 Cantoblanco, Madrid, Spain |
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Abstract: | Solid-state compatibility and melting relations of MgAl2O4 in the quaternary system Al2O3–CaO–MgO–SiO2 were studied by firing and quenching selected samples located in the 65 wt% MgAl2O4, plane followed by microstructural and energy dispersive X-ray analysis. A projection of the liquidus surface of the primary crystallization volume of MgAl2O4 was constructed from CaO, SiO2 and exceeding Al2O3, not involved in stoichiometric MgAl2O4 formation; those three amounts were recalculated to 100 wt%. The temperature and character of six invariant points, where four solids co-exist with a liquid phase, were defined. One maximum point was localized and the positions of the isotherms were tentatively established. The effect of CaO, SiO2, and Al2O3 impurities on the high temperature behavior of spinel materials was also discussed. |
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