Synthesis of the MgAl₂O₄ Spinel Obtained via Combustion Reaction Using Glycerine from the Biodiesel as a Fuel for Producing Cellular Ceramics

Abstract:

Magnesium aluminate (MgAl₂O₄) was synthesized via combustion reaction, using as fuel glycerine from biodiesel, for the production of cellular ceramics. A rheologically stable suspension was prepared in a ball mill and polyurethane sponges were impregnated. In order to define a firing cycle which would result in ceramic foams with high density ceramic walls (struts), synthesized and calcined powders were uniaxially pressed at 5.4 MPa and, after drying (110°C/120 min), fired at different temperatures (1450-1650°C) for 120 min. Thus, ceramic foams (fired at 1600°C/120 min) containing MgAl₂O₄ as the only formed crystalline phase with a porosity of 88 ± 0.5% and compression strength of 1.0 ± 0.3 MPa were obtained.

• Periodical: Materials Science Forum (Volume 820)
• Pages: 96-101
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.820.96
• Online since: June 2015
• Authors: Graziela Guzi de Moraes*, Antonio Pedro Novaes de Oliveira
• Keywords: Cellular Ceramics, Combustion Synthesis, Glycerine, Magnesium Aluminate

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