CaO对Li2O-Al2O3-SiO2微晶玻璃热膨胀性能的影响
Effect of CaO on Thermal Expansion Properties of Li2O-Al2O3-SiO2 Glass-Ceramics
马婧 1黄世玉 1赵骁锋 2李玉香 1曹青 1杨文宏 1岳子富 1沈尚勇3
作者信息
- 1. 西南科技大学 材料与化学学院,四川 绵阳 621010
- 2. 西南科技大学 材料与化学学院,四川 绵阳 621010;清华大学 材料学院,北京 100084
- 3. 四川领先微晶玻璃有限公司,四川广安 638600
- 折叠
摘要
近年来,作为Li2O-Al2O3-SiO2(LAS)微晶玻璃主要原料之一的锂矿价格持续上涨,因此开展LAS微晶玻璃的降锂研究对LAS微晶玻璃企业的可持续发展具有重要意义.采用熔融法制备LAS基础玻璃,通过退火、形核及析晶处理得到LAS微晶玻璃,系统研究了CaO对于LAS微晶玻璃的析晶行为及热膨胀性能的影响.结果表明,CaO可以促进晶粒生长与析晶,配方中CaO添加量从0.3%增至0.8%时,晶粒尺寸从32.66 nm增至34.92 nm,当CaO添加量增加到0.6%之后,样品晶体含量开始增多.CaO添加量较低时,Ca2+断键作用不如Li+强烈,导致高温黏度并未下降.随着CaO和Li2O质量比增加,Li+与Ca2+共同作用导致玻璃网络结构更加松散,从而增大热膨胀系数.C0.3～C0.8 样品在25～600℃范围内的热膨胀系数平均值均小于8×10-7/K,表明样品均具有良好的热稳定性.
Abstract
In recent years,the price of lithium ore,one of the main raw materials of Li2O-Al2O3-SiO2(LAS)glass-ceramics,continues to rise,so it has great significance to carry out research on lithium reduction of LAS glass-ceramics for the sustainable development of LAS glass-ceramics enter-prises.LAS-basic glass was prepared by melting method,and LAS glass-ceramics were obtained by annealing,nucleation and crystallization treatment.The effects of CaO on crystallization behavior and thermal expansion of LAS glass-ceramics were systematically studied.The results show that CaO can promote grain growth and crystallization.When CaO content increases from 0.3%to 0.8%,the grain size increases from 32.66 nm to 34.92 nm,and the crystals begin to increase when CaO content is more than 0.6%.The bond-breaking effect of Ca2+is not as strong as that of Li+when the amount of CaO is low,as a result,the high-temperature viscosity does not decrease.With the mass ratio of CaO and Li2O increases,the interaction of Li+and Ca2+leads to the looser structure of the glass network,thus increasing the coefficient of thermal expansion.The average thermal expansion coefficient of C0.3-C0.8 samples in the range of 25-600℃is less than 8×10-7/K,indicating that the glass-ceramic samples of this group of formulations has good thermal stability.
关键词
LAS/CaO/析晶/热膨胀/高温黏度Key words
LAS/CaO/crystallization/thermal expansion/high-temperature viscosity引用本文复制引用
基金项目
国家自然科学基金(12105236)
四川省科技计划(2023NSFSC1313)
西南科技大学博士基金(21zx7104)
出版年
2024
NETL
NSTL
万方数据