牙科用云母微晶玻璃的微观结构对其力学性能的影响  

Influence of microstructure on mechanical properties of mica-based glass-ceramics for dental restorations.

作　　者：秦燕军[1] 王忠义[1] 曹小刚[2] 田杰谟[2] 

机构地区：[1]第四军医大学口腔医学院,陕西西安710032 [2]清华大学新型陶瓷与精细工艺国家重点实验室

出　　处：《口腔医学纵横》2001年第2期91-94,共4页Journal of Comprehensive Stomatology

基　　金：国家"九.五"重点科技项目攻关计划子课题!(编号 :96 -A10 -0 1-10 -0 1)

摘　　要：目的 :研究牙科CAD/CAM加工用四硅氟云母微晶玻璃的微观结构对其力学性能的影响。方法 :采用K2 O -MgO -MgF2 -SiO2 系统来研制云母微晶玻璃 ,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 )及力学性能测试 ,比较了三种不同晶化温度下 ,四硅氟云母微晶玻璃的微观结构对其力学性能影响。结果 :随着晶化温度的逐步升高 ,四硅氟云母的晶粒大小和径厚比逐步增大 ,抗弯强度和断裂韧性亦逐渐增高 ,维氏硬度和脆性指数随温度升高而降低。结论 :云母微晶玻璃的微观结构对其力学性能起决定作用 。Objective:To investigate the influence of microstructure on mechanical properties of mica based machinable glass ceramics used for CAD/CAM restorations.Methods:According to the requirements of dental restorative materials, K 2O MgO MgF 2 SiO 2 system was chosen to form tetrasilicic fluormica glass ceramics and three different temperatures were used to finish crystallization process.Differential thermal analysis(DTA),X ray diffractometer(XRD) and scanning electron microscopy(SEM) were used to observe the crystallization behavior,crystalline phases and microstructures of the glass ceramics.Influence of microstructure on mechanical properties of the glass ceramics was compared.Results:Improving crystallization temperature can increase the grain sizes and aspect ratio of mica and improve the three point bending strength and fracture toughness of the glass ceramics.Vickers hardness and the index of brittleness decrease with increasing of temperature.Conclusion:The mechanical properties of the glass ceramic are determined by its microstructure,while the latter has a close relationship with crystallization temperature. [

关 键 词：微晶玻璃 四硅氟云母 微观结构 力学性能 

分 类 号：R783.1[医药卫生—口腔医学]