Microstructural development of SrAl12O19 in alumina–strontia composites

Boehmite sol was prepared by hot water hydrolysis of aluminium iso-propoxide using nitric acid as catalyst. Strontium nitrate was added to the boehmite sol to yield 0-20 vol% strontia. The boehmite with additives was dried at 120 C. The powder samples were calcined at 1600 C for 3 h and the formatio...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2009-01, Vol.29 (1), p.77-83
Main Authors: Vishista, K., Gnanam, F.D.
Format: Article
Language:English
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Summary:Boehmite sol was prepared by hot water hydrolysis of aluminium iso-propoxide using nitric acid as catalyst. Strontium nitrate was added to the boehmite sol to yield 0-20 vol% strontia. The boehmite with additives was dried at 120 C. The powder samples were calcined at 1600 C for 3 h and the formation of strontium hexa-aluminate was investigated using phase diagrams, TEM and energy dispersive spectra. The powder samples calcined at 500 C were milled for 6 h, compacted into cylindrical pellets using uniaxial pressure at 180 MPa and sintered at 1600 C for 6 h. A microstructural model was proposed for the formation of strontium hexa-aluminate. The sintered pellets were ground and phases determined using XRD. The formation of hexa-aluminate (plate-like) grains was confirmed using optical microscopy and SEM. 24 refs.
ISSN:0955-2219
DOI:10.1016/j.jeurceramsoc.2008.05.041