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Synthesis, morphology, and formation mechanism of mullite particles produced by ultrasonic spray pyrolysis

Published online by Cambridge University Press:  31 January 2011

Dj. Janaćković ,
V. Jokanović ,
Lj. Kostić-Gvozdenović ,
Lj. Živković  and
D. Uskoković
Dj. Janaćković
Affiliation:
Faculty of Technology and Metallurgy, Belgrade, Yugoslavia
V. Jokanović
Affiliation:
Institute for Technology of Nuclear and Other Mineral Row Materials, Belgrade, Yugoslavia
Lj. Kostić-Gvozdenović
Affiliation:
Faculty of Technology and Metallurgy, Belgrade, Yugoslavia
Lj. Živković
Affiliation:
Faculty of Electronics, Niš, Yugoslavia
D. Uskoković
Affiliation:
Institute of Technical Sciences of the Serbian Academy of Sciences and Arts, Belgrade, Yugoslavia
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Abstract

Submicrometer spherical particles of mullite powder were synthesized by ultrasonic spray pyrolysis of emulsion and solutions, using tetra-ethyl-orthosilicate (TEOS) or silicic-acid and Al(NO3)3 · 9H2O as initial compounds. Crystallization of mullite phase was determined by differential thermal (DT), thermogravimetric (TG), infrared (IR), and x-ray analyses. The synthesis of mullite from TEOS emulsion occurs by crystallization of γ–Al2O3 (or Al, Si-spinel) from the amorphous phase and its subsequent reaction with amorphous SiO2, as well as by crystallization of pseudotetragonal mullite below 1000 °C and its subsequent phase transformation into orthorhombic mullite. In the powders produced from silicic acid solutions, synthesis of mullite occurs only by crystallization of γ–Al2O3 between 900 and 1000 °C and its further reaction with amorphous SiO2 between 1100 and 1200 °C. Particle formation mechanism depended directly on the initial emulsion or solution preparation, i.e., on the phase separation in the emulsion and on the silicic-acid crosslinking conditions.

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Articles
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Journal of Materials Research , Volume 11 , Issue 7 , July 1996 , pp. 1706 - 1716
Copyright
Copyright © Materials Research Society 1996

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