氧化锂含量对牙科云母微晶玻璃析晶性能的影响  

Effect of Li_2O Addition on the Crystallization Property of Mica Based Glass-ceramics

作　　者：赵英华 陈吉华 马新沛[2] 李娜[1] 孙翔 沈丽娟 

机构地区：[1]第四军医大学口腔医院修复科,陕西西安710032 [2]西安交通大学金属材料强度国家重点实验室

出　　处：《口腔医学研究》2008年第1期4-8,共5页Journal of Oral Science Research

基　　金：国家自然科学基金(编号:50672127);陕西省自然科学基金项目资助

摘　　要：目的:研究Li2O对SiO2-Al2O3-MgO-Na2O-K2O-F云母玻璃陶瓷析晶性能、显微结构和抗弯强度的影响。方法:在玻璃基础成分中添加不同含量的Li2O,由差热分析(DTA)曲线确定热处理制度,采用X射线衍射分析(XRD)、扫描电子显微镜(SEM)和三点弯曲强度测试来观测和比较晶体成分、形貌和材料的力学性能。结果:3组玻璃的核化温度为530℃,最适晶化温度随Li2O含量的增加而降低。680℃热处理1h后,含4%Li2O的母体玻璃析出的云母晶体发育完全,抗弯强度最高(183.82±12.47)MPa。结论:添加一定量的Li2O有助于改善SiO2-Al2O3-MgO-Na2O-K2O-F系云母玻璃陶瓷的析晶性能和力学强度。Objective： To investigate the effects of Li2O on the crystallization behavior of SiO2 - Al2O3 - MgO - Na2O - K2O - F system. Methods： Differential 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 - ceramics. Three point bending strength was also measured. Results： With increasing Li20 content, the crystallization exothermal peak decreased. More developed fluorphlogopite crystals appeared in the glass system which contained 4% addition of Li2O After heat - treatment at 680℃ for 1 hour, the specimens showed stronger flexure toughness （ 183.82± 12. 47 MPa） than the others. Conclusion： The composition of Li20 can improve the crystallization property and mechanical property of SiO2 - Al2O3 - MgO - Na2O - K2O - F glass - ceramics.

关 键 词：玻璃陶瓷 氧化锂 氟金云母 微观结构 

分 类 号：R783[医药卫生—口腔医学]