Abstract
The aim of this study was to compare the mechanical properties of various pressable diopside glass crowns (CaCO3-MgO-SiO2-TiO2-Al2O3). Four crystallization temperatures (890, 900, 910, 920℃) and durations (1, 10, 20, 30 min) were used to evaluate the effects on the compressive strength, bending strength and diametral tensile strength. Thermal expansion ratio, X-ray analysis and crystal structure were also examined. The compressive strength, bending strength, and diametral tensile strength were 635-1483 MPa, 179-422 MPa and 19-58 MPa, respectively. The results varied by crystallization temperatures and durations. No crystal was observed in the glass ingot, 1-2μm crystals were formed at 890℃ for 1 min, 3-4μm crystals were formed at 900℃ for 30 min, over 10μm crystals were formed at 920℃ for 30 min. According to the results obtained, the crystallization temperature and durations have statistically significant effects on the particle size and number of crystals.
