【摘要】 目的研究氧化钾(K2O)的含量对牙科微晶玻璃析晶性能的影响。方法在Li2O-SiO2-Al2O3-P2O5-ZnO体系的基质玻璃中添加不同含量的K2O,根据差热分析(DTA)曲线确定微晶玻璃的热处理制度,采用X射线衍射分析和扫描电子显微镜(SEM)观测来比较不同的K2O含量对牙科Li2O-SiO2-Al2O3-P2O5-ZnO体系微晶玻璃析晶成分和显微结构的影响。结果K2O的引入有助于降低玻璃基体的粘度,促进基质玻璃的析晶。在基质玻璃中添加5.3wt%的K2O可以使玻璃在热处理后析出较多的二硅酸锂晶体,晶体呈板条状,长度约为4μm,在玻璃基质中分布均匀。结论添加一定量的K2O有助于提高牙科Li2O-SiO2-Al2O3-P2O5-ZnO体系微晶玻璃的析晶性能。更多还原

【Abstract】 Objective To evaluate the effect of K2O addition on the crystallization property of dental glass-ceram-ics in the Li2O-SiO2-Al2O3-P2O5-ZnO system. Methods Different content of K2O was added into Li2O-SiO2-Al2O3-P2O5-ZnO glass system. The heat-treated system of the glass-ceramics was determined by differential thermal analyses(DTA), then the crystallization components and the microstructure of the glass-ceramics with different content of K2O were investigated from X-ray diffraction(XRD) analyses and scanning electron microscopy(SEM). Results Addition of K2O helped to reduce the viscosity of the glass system and improved crystallization. More lithium disilicate crystals appeared after heated-treatment of the glass system which contained 5.3wt% addition of K2O, and the homogeneously lath-shaped crystals were 4 μm in length. Conclusion Certain content of K2O can improve the crystallization property of dental glass-ceramics in the Li2O-SiO2-Al2O3-P2O5-ZnO system.更多还原