低膨胀锂铝硅微晶玻璃烧结-析晶行为与性能研究
Sintering-Crystallization Behavior and Properties of Low Expansion Lithium Aluminosiliate Glass-Ceramics
陈丹丹 1吕大娟 2陈巧 2刘佳 2韩建军 1王静 1李路瑶1
作者信息
- 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. 光纤光缆先进制造与应用技术全国重点实验室,武汉 430070
- 折叠
摘要
本文采用烧结法制备了低膨胀Li2O-Al2O3-SiO2(LAS)微晶玻璃,研究了ZnO部分取代Li2O对LAS微晶玻璃显微结构、烧结行为、析晶行为和性能的影响.结果表明,ZnO取代Li2O降低了 LAS微晶玻璃起始析晶温度,LAS微晶玻璃在800 ℃保温10 min时便有大量Li2Al2Si3O10晶相析出,阻碍了玻璃的烧结收缩,而不含ZnO的LAS微晶玻璃在800℃析晶缓慢,有利于烧结致密化.当烧结温度为1 100 ℃时,微晶玻璃的主晶相均为β-锂辉石,其中不含ZnO的LAS微晶玻璃热膨胀系数为1.747×10-6 K-1,抗弯强度为138.4 MPa,介电常数为3.52,介电损耗为0.001 6.
Abstract
Low expansion Li2O-Al2O3-SiO2(LAS)glass-ceramics were prepared using sintering method.The effect of ZnO partially substitution for Li2O on the microstructure,sintering behavior,crystallization behavior and properties of LAS glass-ceramics was investigated.The results show that the substitution of ZnO for Li2O reduces the initial crystallization temperature of LAS glass-ceramics,leading to significant amount of Li2Al2Si3O10 phase precipitating out after holding at 800 ℃ for 10 min,which hinders the sintering shrinkage of glass.In contrast,the LAS glass-ceramics without ZnO exhibits slower crystallization at 800℃,which is beneficial for sintering densification process.When the sintering temperature is 1 100℃,the main crystalline phase present in glass-ceramics is identified as β-spodumene.The coefficient of thermal expansion of glass-ceramics without ZnO is 1.747 x 10-6 K-1,the flexural strength is 138.4 MPa,the dielectric constant is 3.52 and the dielectric loss is 0.001 6.
关键词
微晶玻璃/β-锂辉石/Li2O-Al2O3-SiO2/低膨胀/烧结Key words
glass-ceramics/β-spodumene/Li2O-Al2O3-SiO2/low expansion/sintering引用本文复制引用
基金项目
光纤光缆先进制造与应用技术全国重点实验室(长飞公司)开放课题(SKLD2207)
出版年
2024
国家科技期刊平台
NSTL
万方数据