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Cerâmica

versão impressa ISSN 0366-6913versão On-line ISSN 1678-4553

Resumo

DEKSNYS, T. P.; MENEZES, R. R.; FAGURY-NETO, E.  e  KIMINAMI, R. H. G. A.. Synthesis of Al2O3/SiC in microwave oven: study of the processing parameters. Cerâmica [online]. 2005, vol.51, n.320, pp.343-348. ISSN 0366-6913.  http://dx.doi.org/10.1590/S0366-69132005000400007.

Results presented elsewhere have confirmed the feasibility of the previous milling process of the starting materials for the synthesis of Al2O3/SiC by the microwave-assisted carbothermal reduction. In the present work, parameters such as precursor milling, reaction time, microwave's power level and gas flow have been investigated. Reactions were carried out in a semi-industrial microwave oven (Cober Inc., USA), which allowed the inert gas insertion. Two reactions arrangement were developed to perform the synthesis: a cylindrical reactor, thermally insulated and a pipe fluidized bed reactor. Into both reactors, the precursor was applied in a palletized form to react. There is a direct relation between the reaction atmosphere saturation and the kinetics of the carbothermal reduction. This behavior, in addiction to high power levels of microwave radiation (>1.5 KW), favors the formation of Al2O3/SiC in a short time.

Palavras-chave : synthesis; Al2O3/SiC; carbothermal; microwave.

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