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Journal of Materials Science

, Volume 29, Issue 23, pp 6131–6138 | Cite as

Role of hydrolysis water-alcohol mixture on mullitization of Al2O3-SiO2 monophasic gels

  • A. K. Chakraborty
Article

Abstract

Two kinds of monophasic gels were synthesized from silicon ethyl ester (TEOS) and aluminium nitrate mixture by varying the water-alcohol content of the system. The mullitization reaction paths of the two gels were studied by differential thermal analysis (DTA) and X-ray diffraction techniques. The first kind of monophasic gel exhibited cubic mullite (Si-Al spinel) on the 980 °C exotherm and a further two more broad exotherms at 1150 and 1243 °C. This phenomenon resembles the DTA thermogram of a kaolinitic clay. The later two exotherms have been explained as due to the formation of mullite by two different reaction paths from the two phases appearing in the 980 °C exotherm. Nucleation and crystallization of mullite from amorphous alumino silicate phase takes place at ∼ 1150 °C, and transformation of cubic mullite to orthorhombic mullite takes place at ∼ 1245 °C. The second kind of monophasic gel exhibited only one exotherm and produced exclusively tetragonal mullite at ∼ 980 °C. The results suggest that pure mullite formation is possible when water induced hydrolysis of TEOS is avoided during the gelation process.

Keywords

Clay Hydrolysis Crystallization Silicate Differential Thermal Analysis 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman & Hall 1994

Authors and Affiliations

  • A. K. Chakraborty
    • 1
  1. 1.Central Glass and Ceramic Research InstituteCalcuttaIndia

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