基于气悬浮法的CaO-Al_(2)O_(3)玻璃析晶动力学及结构起源  

Crystallization Kinetic Study and Structure of Calcium Aluminate Glasses Prepared by Aerodynamic Levitation Method

作　　者：张丙容 胡向平 王琰[1] 顾少轩[1] ZHANG Bing-rong;HU Xiang-ping;WANG Yan;GU Shao-xuan(State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070,China;Hubei New Huaguang Information Materials Co,Ltd,Xiangyang 441057,China)

机构地区：[1]武汉理工大学硅酸盐建筑材料国家重点实验室,武汉430070 [2]湖北新华光信息材料有限公司,襄阳441057

出　　处：《武汉理工大学学报》2019年第10期1-6,共6页Journal of Wuhan University of Technology

基　　金：武汉理工大学研究生优秀学位论文培育项目(2018-YS-008)。

摘　　要：利用气悬浮法制备了CaO-Al_(2)O_(3)二元体系钙铝玻璃。基于DSC测试数据,采用Matusita方程对制得的CaO-Al_(2)O_(3)玻璃进行了析晶动力学的研究,并通过Raman、NMR和XRD等方法探索了玻璃析晶特性的结构起源。结果表明:12CaO·7Al_(2)O_(3)和CaO·2Al_(2)O_(3)呈整体析晶,分别是因为[AlO4]四面体网络解聚程度高和出现不稳定的五配位Al3+导致结构容易发生重排。CaO·Al_(2)O_(3)析晶活化能最大(E=1064kJ/mol),呈表面析晶,是因为[AlO4]四面体连接紧密,析出晶相与母相化学组成相差大,结构难以发生重排,需要借助表面发生异相成核。The CaO-Al_(2)O_(3)binary system calcium aluminum glass was prepared by the aerodynamic levitation method.Matusita equation was used to study the crystallization kinetics of the prepared CaO-Al_(2)O_(3)glass based on the DSC data.And the structural origin of the crystallization was explored by Raman,NMR,and XRD methods.The experimental results show that the crystallization mechanism of 12 CaO·7Al_(2)O_(3)and CaO·2 Al_(2)O_(3)are bulk crystallization,because of the easier rearrangement of structure caused by the high degree of depolymerization of the[AlO;]tetrahedral network and the unstable five-coordinated Al;,respectively.CaO·Al_(2)O_(3)has the largest crystallization activation energy(E=1064 kJ/mol),and the crystallization mechanism is surface crystallization.That the tightly connected of[AlO;]tetrahedron and greatly different in chemical composition from glass to the crystal phase make the rearrange more difficult,so the crystallization relies on the heterogeneous nucleation in the surface.

关 键 词：钙铝玻璃 气悬浮法 析晶动力学 结构 

分 类 号：TB484[一般工业技术—包装工程]