Nucleation, Crystallization and Characterization of Mica-Based Glass-Ceramics with Fluorapatite

Jia Bai; Duangrudee Chaysuwan

doi:10.4028/www.scientific.net/AMR.936.164

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 936Nucleation, Crystallization and Characterization...

Nucleation, Crystallization and Characterization of Mica-Based Glass-Ceramics with Fluorapatite

Abstract:

The glass system of SiO₂-Al₂O₃-MgO-MgF₂-SrCO₃-CaCO₃-CaF₂-P₂O₅ was used to prepare machinable glass-ceramics for restorative dental applications. The aim of this study was to apply various heat treatments to produce mica-based glass-ceramics. Differential Thermal Analysis (DTA) was used to determine the optimal heat treatment conditions for nucleation and growth of the crystalline phases in the quenched glass. It was found that the optimum nucleation temperatures for the first and the second crystallization temperatures (T_p1and T_p2) were 642°C and 635°C, respectively, and the optimum nucleation times were between 2 and 4 hours. X-Ray Diffraction (XRD) showed the phases developed were anorthite, calcium-mica, fluorapatite, strontium apatite, forsterite, fluorite and stishovite phases. The microstructures of glass-ceramics were observed by Scanning electron microscope (SEM), found to exhibit plate-like mica crystals with high interlocking and randomly oriented with a higher soaking temperature and prolongation of the soaking time for crystallization.

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Periodical:

Advanced Materials Research (Volume 936)

Pages:

164-169

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.936.164

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Online since:

June 2014

Authors:

Jia Bai*, Duangrudee Chaysuwan

Keywords:

Crystallization, Fluorapatite, Glass-Ceramic, Mica, Microstructure

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