文档介绍：晶化温度对牙科用云母微晶玻璃微观结构的影响
作者:秦燕军,王忠义,曹小刚,田杰谟
【关键词】玻璃/超微结构
关键词: 玻璃/超微结构;四硅氟云母;径厚比
摘要:目的研究晶化温度对牙科CAD/CAM加工用四硅氟云母微晶玻璃微观结构的影响. 方法选用K2 O-MgO-MgF2 -SiO2 系统来制备云母微晶玻璃,通过差热分析(DTA)、X射线衍射分析(XRD)、扫描电子显微镜观测(SEM)及三点弯曲强度的测试,比较了三种不同晶化温度对四硅氟云母微晶玻璃的晶化特性、微观结构及抗弯强度的影响. 结果随着晶化温度的逐步升高,四硅氟云母晶粒的形态由球形转变为片层状,晶粒尺寸和径厚比逐步增大,微晶玻璃的抗弯强度也逐步升高,但其晶相组成未发生明显变化. 结论晶化温度对四硅氟云母微晶玻璃的微观结构起决定作用.
Keywords:glass/ultrastructure;tetrasilicic fluormica;aspect ratio
Abstract:AIM To investigate the influence of crystalliza-tion temperature on microstructures of mica-based machin-able glass-ceramics used for CAD/CAM dental restorations.
METHODS According to the requirements of dental restorative materials,K2 O-MgO-MgF2 -SiO2 glass-ceramics system was chosen to make tetrasilicic fluormica glass-ceram-ics and three different temperatures were used to finish the crystallization thermal analysis(DTA),X-ray diffractometry(XRD)and scanning electron microscopy(SEM)were used to observe the crystallization behavior,crystalline phases and microstructures of the glass- point bending strength was also Grain shape changes from spherical to platelike as crystallization temperature went crystalliza-tion temperature was increase the grain size,aspect ratio and flexural strength of the mica,while the crystalline phase is not affected by temperature change