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Abstract
The behavior of Colombian magnesite in producing spinel was evaluated by comparing its physical properties and XRD-determined phases with spinel derived from pure magnesium oxide. Spinel finds utility as a refractory in cement and steel industries (Henry, 1997), as an abrasive material, an electric circuit substrate, ceramic membranes, and recently in dental restorations. Spinel forms through a thermally activated reaction above 1100ºC between magnesia and alumina. Two compositions were selected based on phase diagrams and studied. Reactants with a particle size smaller than 10 mm were dry pressed and sintered at 1650ºC. The presence of silica in the starting mineral and excess magnesia added facilitated sintering.
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References
Bailey, J., Russell, R. 1968. "Sintered spinel ceramics". Ceramic Bulletin. 47 (11): 1025-1029.
Fyfe, W.S. 1964. "Geochemistry of Solids". 1st ed. McGraw-Hill Book Company. New York.
Handwerker, C., Blendell, J. 1988. "Ceramic Transactions. Sintering of Advanced Ceramics". National Institute of Standards and Technology. Westerville, Ohio. 13.
Henry, W., Stendera, J. 1997. "Producing basic refractories for steel applications". Ceramic Industry, February: 29-32.
Mojica, A. 1997. "Estudio de la potencialidad refractaria de algunas magnesitas nacionales". (Tesis de Grado) Universidad Nacional de Colombia. 117 p. Bogotá.
Morrell, R. 1985. "Handbook of Properties & Engineering Ceramics. Part 1. An introduction for the engineer and designer". National Physical Laboratory. New York.
Pasquier, J., Komarneni, R., Roy, R. 1991. "Synthesis of MgAl2O4 spinel: seeding effects on formation temperature". Journal of Materials Science, 26, 3797-3802.
Pena, P. 1998. Diagrama elaborado por Pilar Pena y enviado por correo. Instituto de Cerámica y Vidrio. CSIC. Madrid - España.
Prasad, T., Radovanovich, S. 1982. "Studies on sintering of some natural magnesites and crystal growth of periclase at high temperature". Trans. Ind. Ceram. Soc. 21(2): 37-48.
Wang, J., Zhang, L., Ren, X., Zhu, X., Gao, P. 1992. "Compositions of alumina-magnesia spinel synthesized from natural raw materials". Interceram, 41 (1).
West, A. 1985. "Solid State Chemistry and its Applications". 1st ed. John Wiley & Sons Ltd. New York.
Zografou, C., Reynen, P., Mallinckrodt, D. 1983. "Nonstoichiometry and sintering of MgO and MgAlpO4". Interceram. (2): 40-42.
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