Ceramics-Silikáty 56, (4) 341 - 346 (2012) |
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PREPARATION OF LEUCITE-BASED COMPOSITES
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Kloužková Alexandra 1, Mrázová Martina 2, Kohoutková Martina 3,
Kloužek Jaroslav 2
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1 Department of Glass and Ceramics, Institute of Chemical Technology, Prague,
Technická 5, 166 28 Prague, Czech Republic
2 Laboratory of Inorganic Materials, Joint Workplace of the Institute of Chemical Technology Prague
and the Institute of Rock Structure and Mechanics ASCR, v.v.i., Holešovičkách 41, 182 09 Prague 8, Czech Republic
3 Central laboratories, Institute of Chemical Technology, Prague,
Technická 5, Prague, 166 28, Czech Republic
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Keywords: Leucite ceramics, Hydrothermal, Dilatation, Coefficient of thermal expansion
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The aim of this study was to prepare leucite dental composites from two separately synthesized 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. Matrix powder was prepared by a classical
melting process and subsequent milling of the quenched glass. The dental composites were prepared by mixing of 10 wt. %,
20 wt. % and 30 wt. % of synthesized tetragonal leucite with glass powder followed by pressing and firing. The sintering
process was observed by optical microscope and the optimal firing temperature for each composite was determined. Optical
and electron microscopy was 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. |
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