摘要
设计玻璃组成及晶化工艺提高Li_(2)O-Al_(2)O_(3)-SiO_(2)微晶玻璃的强度是当前亟需解决的问题。本文通过熔融浇铸法制备了具有特定组成的Li_(2)O-Al_(2)O_(3)-SiO_(2)玻璃,通过两步热处理方法制备了高强度半透光微晶玻璃。差示扫描热分析结果显示玻璃的转变温度为532℃,且有多个析晶峰。热处理后,X射线衍射证明了玻璃中析出以Li _(2)Si_(2)O_(5)、LiAlSi_(3)O_(8)、LiAlSi_(4)O_(10)为主晶相的晶体,且随着热处理温度的上升或时间延长,透锂长石逐渐转变为锂辉石晶相,晶粒尺寸也从70 nm(热处理条件为:750℃,0.5 h和780℃,10 h)生长至340 nm(热处理条件为:820℃,0.5 h和850℃,4 h),微晶玻璃从半透光转变为完全乳浊。微晶玻璃具有优异的机械性能,维氏硬度最大可达9.15 GPa,环上环的最大负载可达1335 N,最大整机跌落高度可达162 cm。此微晶玻璃可用于手机等电子器件的背板保护玻璃。
It’s an urgent problem to improve the strength of Li_(2)O-Al_(2)O_(3)-SiO_(2) glass ceramics by glass composition design and crystallization process control.In this paper,Li_(2)O-Al_(2)O_(3)-SiO_(2) glass with specific composition was prepared by melt-quenching method,and high strength semi-translucent glass ceramics were prepared by two-step heat treatment.Differential scanning thermal analysis shows that the glass transition temperature is 532℃and there are multiple crystallization peaks.After heat treatment,X-ray diffraction patterns prove that Li _(2)Si_(2)O_(5)、LiAlSi_(3)O_(8)、LiAlSi_(4)O_(10) as the main crystal phases are precipitated in the glass,petalite crystals gradually changes into spodumene crystal phases with the increase of heat treatment temperatures or durations,and average crystal sizes grow from 70 nm(heat treatment parameters:750℃,0.5 h and 780℃,10 h)to 340 nm(heat treatment parameters:820℃,0.5 h and 850℃,4 h).The glass ceramics change from translucent to opacities.Glass ceramics have excellent mechanical properties,the maximum Vickers hardness is 9.15 GPa,the maximum ring-on-ring load can reach 1335 N,and the maximum simulated whole machine drop height can reach 162 cm.The glass ceramics can be used as backplane protection glass for mobile phone devices.
作者
周卫卫
陈宝
郝振邦
何光园
朱凯迪
刘景仲
张福军
张继红
ZHOU Weiwei;CHEN Bao;HAO Zhenbang;HE Guangyuan;ZHU Kaidi;LIU Jingzhong;ZHANG Fujun;ZHANG Jihong(Changshu Jiahe Display Technology Co.,Ltd.,Changshu 215500,China;State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070,China)
出处
《硅酸盐通报》
CAS
北大核心
2022年第11期3813-3818,共6页
Bulletin of the Chinese Ceramic Society
关键词
微晶玻璃
维氏硬度
热分析
机械性能
热处理
熔融浇铸法
glass ceramics
Vickers hardness
thermal analysis
mechanical property
heat treatment
melt-quenching mehtod
