PREPARATION OF LEUCITE-BASED COMPOSITES

An attempt was made to prepare leucite dental composites from two separately synthesised components - tetragonal leucite and glassy matrix. The newly developed procedure is based on the preparation of crystalline tetragonal leucite powder by relatively low temperature synthesis under hydrothermal co...

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Bibliographic Details
Published in:Ceramics (Praha) 2012-01, Vol.56 (4), p.341-346
Main Authors: Klouzkova, A, Mrazova, M, Kohoutkova, M, Klouzek, J
Format: Article
Language:English
Subjects:
Coefficient of thermal expansion
Dilatation
Firing
Glass
Glassy
Hydrothermal
Leucite ceramics
Optical microscopy
Potassium aluminum silicates
Pressing
Sintering (powder metallurgy)
Thermal expansion
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Summary:An attempt was made to prepare leucite dental composites from two separately synthesised components - tetragonal leucite and glassy matrix. The newly developed procedure is based on the preparation of crystalline tetragonal leucite powder by relatively low temperature synthesis under hydrothermal conditions. The matrix powder was prepared by a classical melting process and subsequent milling of the quenched glass. The dental composites were prepared by mixing 10 wt%, 20 wt% and 30 wt% of synthesised tetragonal leucite with glass powder followed by pressing and firing. The sintering process was observed by optical microscopy and the optimal firing temperature for each composite was determined. Optical and electron microscopy were used to characterise the microstructure of the composites, especially the distribution of the leucite particles in the matrix. Dilatometric measurements proved that the coefficient of thermal expansion of the composites increased up to 44% in comparison with the basic matrix.
ISSN:0862-5468
1804-5847