Aqueous sol-gel synthesis of mullite powder by using aluminium oxalate and tetraethoxysilane
- 175 Downloads
Gels with the composition of mullite (3Al2O3-2SiO2) were prepared from an aqueous solution of aluminium oxalate and tetraethoxysilane. High-purity stoichiometric mullite powders were produced by calcination of the gel powders with a small exothermic event at 1250 °C. The chemical and structural evolutions were characterized as a function of heat treatment by differential thermal analysis (DTA), thermogravimetric analysis (TGA), X-ray powder diffraction (XRD) and infrared (i.r.) spectroscopy. The composition of mullite varied with the temperature of the heat treatment.
KeywordsPolymer Aqueous Solution Heat Treatment Thermal Analysis Calcination
Unable to display preview. Download preview PDF.
- 2.W. D. Kingery, H. K. Bowen and D. R. Uhlman, “Introduction to ceramics”, 2nd Edn (Wiley, New York, 1975) p. 583.Google Scholar
- 4.R. F. Davis and J. A. Pask, “High temperature-oxides, Part IV” edited by A. M. Alper (Academic Press, New York, 1971) p. 37.Google Scholar
- 7.A. H. Kumar and J. B. Niklewski, Amer. Ceram. Soc. Bull. 58 (1979) 1179.Google Scholar
- 9.J. D. Crofts and W.W. Marshall, Trans. Brit. Ceram. Soc. 66 (1967) 121.Google Scholar
- 11.D. M. Roy, P. R. Neurgaonkar, T. P. O. Holleran and R. Roy, Amer. Ceram. Soc. Bull. 56 (1977) 1023.Google Scholar
- 17.A. K. Chakraborty and D. K. Ghosh, ibid. 69 (1986) C202.Google Scholar
- 27.W. E. Cameron, Amer. Ceram. Soc. Bull. 56 (1977) 1003.Google Scholar
- 30.J. A. Gadsden, “Infrared spectra of minerals and related inorganic compounds” (Butterworth, London, 1975) pp. 43, 189.Google Scholar