چكيده به لاتين
In this research, dental glass-ceramic containing leucite phase was synthesized and its mechanical and chemical properties were investigated. For this purpose, at first, by using the three-phase diagram SiO2-Al2O3-K2O, a combination with weight percentages of 56SiO2.11.8Al2O3.10K2O.5.42Na2O.3.53BaO.9.58B2O3.1.46ZrO2.0.61TiO2.0.61CaO was considered. After preparing the glass ferrite by conventional melting-cooling method, differential thermal analysis (DTA) was performed on it. Based on this experiment, no clear crystallization peak was observed in the DTA graph of the glass. Then, the glass shards were shaped and heat treated, and the crystallized phase in them was analyzed by X-ray diffraction (XRD) analysis. It was observed that the phase is not crystallized in the glass. For this reason, by increasing the amount of K2O to 12% by weight in the glass, its crystallization behavior was re-examined. In this combination, the problem of crystallization remained strong. As a result, in the next composition, the amount of TiO2 nucleation was doubled, but the XRD results still indicated that the samples did not crystallize after heat treatment. As a result, CeO2 nucleator was added to the composition of the glass, which did not change much, finally, together with CeO2, Sb2O3 nucleator was investigated. By adding Sb2O3 in the DTA graph of glass, the crystallization peak appeared at 1119˚C, so the glass prepared at this temperature and 30˚C above and below this temperature was subjected to heat treatment, and in all three samples, the leucite phase along with the secondary phase Quartz became crystallized, and the amount of crystallinity increased with increasing temperature. Therefore, the microstructure of the prepared glass ceramics was examined by scanning electron microscope (SEM), which confirmed the crystallization of the leucite phase, and it was also observed that the kerning phenomenon occurred in the glass ceramics. Therefore, the mechanical and chemical properties of these samples were evaluated, and the results showed that research should be continued on increasing the strength of the samples, but the samples have suitable chemical properties for dental applications. Key words: dental glass ceramic - leucite - mechanical properties
