Abstract
Polymeric monolithic doped zirconia and zirconia-alumina stiff gels (via stable zirconia and zirconia-alumina sols respectively), derived from Zr-n-propoxide, acetyl acetone, aluminium chloride, di-methyl formamide etc with judicious time-temperature-pH selection, have been prepared by controlled hydrolysis and polycondepsation, and subsequently subjected to heat treatment at 1300°C. The crystallization behaviour of the gels was studied by X-ray powder diffraction and differential thermal analysis. For the dried (25°C) composite gels pore size distributions were estimated. FTIR spectra (at 25° and 200°C) and scanning electron microscopy (at 25° and 1300°C) of both types of gels revealed that low temperature sintering is influenced by the addition of alumina sol in doped zirconia sol matrix to result in a better monolithicity. The microhardness of the fired composite gel was also determined.
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