Title: Synthesis and characterization of submicrometer monosized ceramic powders of Aluminium titanate-Mullite composite by sol-gel process

Authors: I.J. Kim, C . Zografou, W. Kronert

Addresses: Institute of Gesteinshuttenkunde, Refractory Section, Techn. University Aachen, Mauerstrasse 5, D-5100 Aachen, Germany. ' Institute of Gesteinshuttenkunde, Refractory Section, Techn. University Aachen, Mauerstrasse 5, D-5100 Aachen, Germany. ' Institute of Gesteinshuttenkunde, Refractory Section, Techn. University Aachen, Mauerstrasse 5, D-5100 Aachen, Germany

Abstract: Submicrometer, monosized ceramic powders of Al₂Ti0₅ Mullite and Aluminium titanate-Mullite compositions were prepared by stepwise alkoxide hydrolysis of tetraethylorthosilicate and titaniumtetraethoxide in A1₂O₃ ethanolic solutions. All particles produced by sol-gel-process were amorphous, monodispersed and with a narrow particle-size distribution. Compacts fired above 1300°C formed Aluminium titanate. Mullite formed first at 1480°C. After decomposition test at 1100°C and cyclic decomposition test at 750°C-1400°C-750°C for 100 hours, Aluminium titanate was stabilized 80% by composition with Mullite.

Keywords: mullite; aluminium titanate; synthesis; characterisation; ceramic powders; composites; sol-gel.

DOI: 10.1504/IJMPT.1993.036556

International Journal of Materials and Product Technology, 1993 Vol.8 No.2/3/4, pp.440 - 451

Published online: 04 Nov 2010 *

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