Journal of Iranian Ceramic Society
Volume 20, Issue 4 (2-2025)
Jicers 2025, 20(4): 0-0 |
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Esfehani F, Baghshahi S, Banijamali S, Mohebi M M. Synthesis of a Leucite-Based Dental Glass-Ceramic and Investigation of Its Crystallization Behavior along with Physical, Mechanical, and Chemical Properties. Jicers 2025; 20 (4)
URL: http://jicers.ir/article-1-539-en.html
URL: http://jicers.ir/article-1-539-en.html
Imam Khomeini International University , baghshahi@eng.ikiu.ac.ir
Abstract: (3 Views)
The present study aims to investigate the crystallization behavior and microstructure of a leucite-based dental glass-ceramic system and to determine its physical, mechanical, and chemical properties. For this purpose, based on modifications in the stoichiometry of the leucite composition, a batch mixture containing silicon, aluminum, potassium, sodium, and lithium oxides with specific weight percentages was melted. Following rapid melt quenching, a glass frit powder was obtained in the form of relatively coarse (D₅₀ = 19.92 µm), completely separate particles with an amorphous nature. Its softening point, crystallization peak, and melting peak were observed at approximately 510°C, 753°C, and 935°C, respectively.
Subsequently, by subjecting the glass frit powder to a heat treatment process, a leucite glass-ceramic with a microstructure of interlocked, randomly oriented crystals (approximately 0.5 µm in size) was prepared. Within the temperature range of 700-1000°C, this material exhibited maximum values of water absorption, linear shrinkage, bulk density, relative density, closed porosity, and open porosity of approximately 1%, 13.5%, 2.6 g/cm³, 96%, 33%, and 11%, respectively. Its flexural strength, fracture toughness, Vickers hardness, brittleness index, and chemical corrosion rate were determined to be 107 MPa, 1.86 MPa.m⁰·⁵, 1.8 GPa, 0.97 µm⁻⁰·⁵, and 2154 µg/cm², respectively.
Furthermore, XRD analysis results, in addition to the three main reflections of the leucite phase, revealed other absorption peaks attributed to the formation of a metastable secondary phase of kalsilite.
Subsequently, by subjecting the glass frit powder to a heat treatment process, a leucite glass-ceramic with a microstructure of interlocked, randomly oriented crystals (approximately 0.5 µm in size) was prepared. Within the temperature range of 700-1000°C, this material exhibited maximum values of water absorption, linear shrinkage, bulk density, relative density, closed porosity, and open porosity of approximately 1%, 13.5%, 2.6 g/cm³, 96%, 33%, and 11%, respectively. Its flexural strength, fracture toughness, Vickers hardness, brittleness index, and chemical corrosion rate were determined to be 107 MPa, 1.86 MPa.m⁰·⁵, 1.8 GPa, 0.97 µm⁻⁰·⁵, and 2154 µg/cm², respectively.
Furthermore, XRD analysis results, in addition to the three main reflections of the leucite phase, revealed other absorption peaks attributed to the formation of a metastable secondary phase of kalsilite.
Type of Study: Research |
Subject:
Glass- Glass-Ceramics
Received: 2025/12/28 | Accepted: 2026/04/12
Received: 2025/12/28 | Accepted: 2026/04/12
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