二硅酸锂微晶玻璃结构调控及性能  

Microstructure regulation and properties of lithium disilicate glass ceramics

作　　者：张皓杰 刘敬肖 单正杰 柳鸣 宁喜亮 李慧 王新源 王承遇 刘天爽 吴成铁[3] ZHANG Haojie;LIU Jingxiao;SHAN Zhengjie;LIU Ming;NING Xiliang;LI Hui;WANG Xinyuan;WANG Chengyu;LIU Tianshuang;WU Chengtie(School of Textile and Materials Engineering,Dalian Polytechnic University,Dalian 116034,China;Dalian Stomatological Hospital,Dalian 116021,China;Shanghai Institute of Ceramics,Chinese Academy Sciences,Shanghai 200050,China)

机构地区：[1]大连工业大学纺织与材料工程学院,辽宁大连116034 [2]大连市口腔医院,辽宁大连116021 [3]中国科学院上海硅酸盐研究所,上海200050

出　　处：《大连工业大学学报》2019年第3期211-215,共5页Journal of Dalian Polytechnic University

基　　金：中国科学院上海硅酸盐研究所高性能陶瓷和超微结构国家重点实验室开放课题基金项目(SKL201514SIC);辽宁省大学生创新训练计划项目(201710152020)

摘　　要：通过熔融-热处理法制备了不同硅锂比(SiO2与Li2O摩尔比)的二硅酸锂微晶玻璃,利用XRD、DTA和SEM对微晶玻璃的微观结构形貌进行了表征,研究了硅锂比和热处理温度制度对二硅酸锂微晶玻璃的晶相组成、晶粒大小以及断裂强度的影响。结果表明,较低的硅锂比(SiO2与Li2O摩尔比为2.109)会促使六边形的偏硅酸锂主晶相形成;而较高的硅锂比(SiO2与Li2O摩尔比为2.469)则会促使形成二硅酸锂主晶相,微观形貌为棒状晶粒的互锁结构。由于二硅酸锂棒状晶体的形成,微晶玻璃在恰当的热处理制度下可以达到较高的断裂强度。Lithium disilicate glass ceramics with different SiO2/Li2O molar ratio were prepared by melting and heat-treatment method.The microstructure and morphology of the lithium disilicate glass ceramics were characterized by X ray diffraction(XRD),differential thermal analysis(DTA)and scanning electron microscopy(SEM).The effects of SiO2/Li2O molar ratio and heat treatment temperature on the crystallization,crystal size and fracture strength were investigated.The result showed that the lower molar ratio of SiO2 to Li2O(2.109)is favorable for the formation of lithium metasilicate phase,while the higher molar ratio(2.469)is conducive to the formation of the lithium disilicate phase with rod-like morphology.The formation of rod-like lithium disilicate crystals indicate that the glass ceramics after appropriate heat-treatment could have higher fracture strength.

关 键 词：二硅酸锂 微晶玻璃 硅锂比 

分 类 号：TQ174.1[化学工程—陶瓷工业]