The effect of fluxing agents and heat treatment on the leucite crystallization in bio glass–ceramic composites
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Tarih
2023
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Springer
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
The main purpose of the present study is to produce leucite-based bio glass–ceramic composite considering the results from the previous studies; however, nucleating oxides are excluded from the production process. The effects of fluxing agents and heat treatment on leucite crystallization in bio glass–ceramic composites are in the center of investigation. At the beginning, a series of laboratory experiments were conducted using the relevant data specified in the literature, then, three different compositions were chosen considering their high leucite content. In these three compositions, the amounts of K2O, Al2O3, and SiO2 were fixed and the amounts of the Na2O, Li2O, CaO, and B2O3 were changed. The batches were glassified and then quenched into water. The produced frits were ground under 63 microns, dried, and shaped. By evaluating the critical temperatures (Tg and Tc/Tp) of DTA, two heat-treatment stages were defined and samples were exposed to cycles. During characterization studies, all samples from two cycles contained leucite as the main phase accompanied by a glassy phase. When the heat-treatment temperature was higher and the period became longer, the amount of leucite phase increased. CTE values were changed with the content of leucite crystal in the glass–ceramic system, as expected. The viscosity curves as functions of temperature were drawn from the compositions using the Lakatos and Fluegel empirical model and correlated with the crystallization behavior. The well-crystallized leucite glass–ceramic structure (42% leucite) was obtained by the recipe LC02, without any addition of nucleating oxides, (after HT02 cycle), with a value of ? is 14.14 10?6/°C. © 2022, The Author(s) under exclusive licence to Australian Ceramic Society.
Açıklama
Anahtar Kelimeler
Dental glass–ceramic, Glass–ceramics, Leucite, Microstructure
Kaynak
Journal of the Australian Ceramic Society
WoS Q Değeri
Scopus Q Değeri
Q2
Cilt
59
Sayı
1
