Effect of Na_(2)O Content on the Structure and Properties of LAS Glass-ceramics Prepared by Spodumene  

作　　者：ZHOU Zhiqiang HE Feng SHI Mingjuan XIE Junlin WAN Peng CAO Dahua 周志强;何峰;SHI Mingjuan;XIE Junlin;WAN Peng;CAO Dahua(School of Materials Science and Engineering,Wuhan University of Technology,Wuhan,430070,China;Foshan Shunde Midea Electro-thermal Appliances Manufacturing Co.,Ltd,Foshan,528000,China)

机构地区：[1]School of Materials Science and Engineering,Wuhan University of Technology,Wuhan,430070,China [2]Foshan Shunde Midea Electro-thermal Appliances Manufacturing Co.,Ltd,Foshan,528000,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2022年第5期794-800,共7页武汉理工大学学报（材料科学英文版）

基　　金：Funded by Research Fund of Center for Materials Research and Analysis,Wuhan University of Technology (No.2018KFJJ11)。

摘　　要：The Li_(2)O-Al_(2)O_(3)-SiO_(2) (LAS) glass-ceramics with low lithium content were prepared from spodumene mineral by melting method.XRD,DSC,and FTIR were used to study the crystallization process and structure of the samples.The results showed that the addition of Na_(2)O promoted the precipitation of β-quartz solid solution and its transformation to β-spodumene solid solution.Mechanical performance tests and FESEM indicated that the larger grain size and inhomogeneous grain dispersion caused by the increase of Na_(2)O content led to lower mechanical properties.In addition,low expansion glass-ceramics were prepared by an appropriate heat treatment according to DSC result,and when Na_(2)O content was in the range of 1.22 wt% to 2.41 wt%,the average coefficient of thermal expansion (CTE) (30-300 ℃) increased from-5.810 ×10^(-7 )to 5.322×10^(-7)℃^(-1).

关 键 词：low thermal expansion Na_(2)O content LAS glass-ceramics SPODUMENE 

分 类 号：TQ171.733[化学工程—玻璃工业]