CaO对Li_(2)O-Al_(2)O_(3)-SiO_(2)微晶玻璃热膨胀性能的影响  

Effect of CaO on Thermal Expansion Properties of Li_(2)O-Al_(2)O_(3)-SiO_(2)Glass-Ceramics

作　　者：马婧 黄世玉 赵骁锋 李玉香[1] 曹青[1] 杨文宏 岳子富 沈尚勇 Ma Jing;Huang Shiyu;Zhao Xiaofeng;Li Yuxiang;Cao Qing;Yang Wenhong;Yue Zifu;Shen Shangyong(School of Materials and Chemistry,Southwest University of Science and Technology,Mianyang,Sichuan 621010;School of Materials,Tsinghua University,Beijing 100084;Sichuan Leading Glass-Ceramics Co.,Ltd.,Guang’an,Sichuan 638600)

机构地区：[1]西南科技大学材料与化学学院,四川绵阳621010 [2]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

出　　处：《非金属矿》2024年第4期21-24,29,共5页Non-Metallic Mines

基　　金：国家自然科学基金(12105236);四川省科技计划资助(2023NSFSC1313);西南科技大学博士基金(21zx7104)。

摘　　要：近年来,作为Li_(2)O-Al_(2)O_(3)-SiO_(2)(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,Ca^(2+)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Ca^(2+)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。In recent years,the price of lithium ore,one of the main raw materials of Li_(2)O-Al_(2)O_(3)-SiO_(2)(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 enterprises.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 Ca^(2+)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 Ca^(2+)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 

分 类 号：O482.23[理学—固体物理] TQ171[理学—物理]