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2009 | 7 | 2 | 228-233
Tytuł artykułu

Mechanism and kinetics of glass-ceramics formation in the LiO2-SiO2-CaO-P2O5-CaF2 system

Treść / Zawartość
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
Two glasses based on lithium disilicate (LS2), with and without fluorapatite (FA), were synthesised in the Li2O-SiO2-CaO-P2O5-CaF2 system with P2O5: CaO: CaF2 ratios corresponding to fluorapatite. Glass-ceramics have then been prepared by thermal treatment. The mechanism and kinetics of crystallization as functions of grain size and rate of heating were investigated using thermal analysis methods. The smaller particles crystallize preferentially by surface crystallization, which is replaced by volume crystallization at larger particle sizes. Inclusion of FA in the LS2 favours crystallization through the surface mechanism. The onset limit for volume crystallization replacing the surface mechanism is at about 0.3 mm for pure LS2 glass and 0.9 mm for glass containing FA. The calculated activation energies of the glasses (299 ± 1 kJ mol-1 for pure LS2 glass and 288 ± 7 kJ mol−1 for glass containing FA according to Kissinger, or 313 ± 1 kJ mol-1 for pure LS2 glass and 303 ± 8 kJ mol-1 for glass containing FA according to Ozawa) indicate that the tendency of the glasses to crystallize is supported by the FA presence. Bioactivity of all samples has been proved in vitro by the formation of new layers of apatite-like phases after soaking in SBF. [...]
Wydawca

Czasopismo
Rocznik
Tom
7
Numer
2
Strony
228-233
Opis fizyczny
Daty
wydano
2009-06-01
online
2009-04-09
Twórcy
autor
  • Slovak University of Technology, Faculty of Chemical and Food Technology, STU, 812 37, Bratislava, Slovak Republic, martin.palou@stuba.sk
  • Slovak University of Technology, Faculty of Chemical and Food Technology, STU, 812 37, Bratislava, Slovak Republic
  • Slovak University of Technology, Faculty of Chemical and Food Technology, STU, 812 37, Bratislava, Slovak Republic
autor
  • Slovak University of Technology, Faculty of Chemical and Food Technology, STU, 812 37, Bratislava, Slovak Republic
Bibliografia
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Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
bwmeta1.element.-psjd-doi-10_2478_s11532-009-0002-6
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