Microwave sintering of cordierite precursor green bodies prepared by starch consolidation

M.L. SANDOVAL; M.H. TALOU; P.M. DE SOUTO; R.H.G.A. KIMINAMI; M.A. CAMERUCCI

CERAMICS INTERNATIONAL

ELSEVIER SCI LTD

Lugar: Amsterdam; Año: 2011 vol. 37 p. 1237 - 1243

0272-8842

This paper reports on a study of the microwave sintering behavior of green disks prepared by the starch consolidation forming method to produce cordierite-based porous materials. Green disks were formed by thermogelling the aqueous suspensions of talc, kaolin and alumina (29.6 vol.%) and potato starch (11.5 vol.%) at 75 and 85 8C for 4 h, drying and calcining. They were characterized by bulk density and apparent porosity measurements, and SEM. Microwave sintering was carried out at 1300 and 1330 8C for 15, 20 and 25 min, applying 50 8C/min. Forpurposes of comparison, an analysis of green disks prepared and calcined in the same conditions and conventionally sintered (1330 8C for 4 h) was also made. The materials were characterized by XRD, bulk density and apparent porosity measurements, and microstructurally analyzed by SEM. The results were analyzed considering the behavior of starch in aqueous suspension at varying temperatures, and the experimental conditions of consolidation and sintering.