Ceramics-Silikáty 49, (4) 252 - 258 (2005) |
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PREPARATION OF LEUCITE POWDERS WITH CONTROLLED PARTICLE SIZE DISTRIBUTION
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Novotná Martina 1, Kloužková Alexandra 2, Maixner Jaroslav 3,
Šatava Vladimír 1
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1 Laboratory of Inorganic Materials, Joint Workplace of the Institute of Chemical Technology Prague
and the Institute of Inorganic Chemistry AS CR, Technická 5, 166 28 Prague, Czech Republic
2 Department of Glass and Ceramics, Institute of Chemical Technology Prague, Technická 5, 166 28 Prague, Czech Republic
3 Central laboratories, Institute of Chemical Technology Prague, Technická 5, 166 28 Prague, Czech Republic
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Keywords: Leucite, Preparation, Particle size distribution
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Leucite ceramics having high fracture toughness and suitable thermal expansion being useful for making ceramic-fused-tometal
restorations represents a very promising material for dental applications. The aim of our work is to replace existing
technologies based on the crystallization from a melt by preparation of a composite material in which leucite and glassy
matrix are synthesised separately. Both these phases are subsequently homogenised and sintered in a dentist laboratory. This
technology ensures reproducible control of leucite ceramics microstructure, which is requited to improve its fracture toughness
and persistence. In the present study preparation of leucite powders with controlled particle size distribution was investigated.
Leucite was prepared by ion exchange of analcime, the degree of ion exchange was determined by XRD and XRF
analysis. As the properties of analcime employed for the reaction are critical for resulting leucite, the effect of process parameters
and starting compositions on the particle size, shape and structure was studied. |
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