Li2O/Na2O对YAS微晶玻璃结构、析晶与力学性能的影响
Effect of Li2O/Na2O on Structure,Crystallization and Mechanical Properties of YAS Glass-Ceramics
郑伟宏 1刘国凤 1张浩 1王启东 1张梦豪 1袁坚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
- 折叠
摘要
透明微晶玻璃由于优异的力学性能被广泛应用于电子领域.本文采用熔融法制备了不同质量分数Li2O和Na2O 的Y2O3-Al2O3-SiO2(YAS)微晶玻璃,通过 Raman、DSC、XRD、FESEM、UV-VIS-NIR 等测试方法研究了其结构特征、析晶与力学性能.结果表明:当碱金属氧化物R2O(R=Li,Na)总量保持不变,随着Li2O取代Na2O含量的增加,YAS微晶玻璃的转变温度、软化温度和结晶峰温度逐渐降低,Q4基团对应的含量逐渐减少,说明Li2O作为网络外体使YAS微晶玻璃结构逐步解聚,玻璃的析晶能力逐渐增强.在同一热处理制度下,随着Li2O取代量的增加,YAS微晶玻璃维氏硬度显著提升,而透过率明显下降.在680 ℃/10 h+750 ℃/1h热处理制度下,可以制备出晶体大小一致且分布均匀的以钇稳定氧化锆为主晶相的透明YAS微晶玻璃,此时2％(质量分数,下同)Na2O+4％Li2O YAS微晶玻璃具有良好的综合性能,如维氏硬度为646 HV,断裂韧性为1.07 MPa·m1/2,透过率为85.7％,在诸多领域具有巨大的应用潜力.
Abstract
Transparent glass-ceramics are widely used in the electronic field due to their excellent mechanical properties.Y2O3-Al2O3-SiO2(YAS)glass-ceramics with different mass fractions of Li2O and Na2O were prepared by melting method,and the structural characteristics,crystallization and mechanical properties were investigated by Raman,DSC,XRD,FESEM,UV-VIS-NIR.The results show that when the total content of R2O(R=Li,Na)remains unchanged,the transition temperature,softening temperature and crystallization peak temperature of YAS glass-ceramics decrease as the content of Li2O replacing Na2O increases,the content of structure units Q4 gradually decreases,indicating that Li2O as a network modifier gradually depolymerizes the structure of YAS glass-ceramics and promotes the crystallization ability of glass.It is also found that with the increase of Li2O content,the Vickers hardness of YAS glass-ceramics increases significantly,while the transmittance decreases significantly at the same heat treatment.Under the heat treatment at 680℃ for 10 h and 750 ℃ for 1 h,YAS glass-ceramics with uniform crystal size and distribution and yttrium stabilized zirconia as the main crystalline phase can be prepared.At present,YAS glass-ceramics containing 2％(mass fraction,the same below)Na2O and 4％Li2O exhibits favorable overall performance.The Vickers hardness is 646 HV,the fracture toughness is 1.07 MPa·m1/2 and the transmittance is 85.7％,which has great potential for many applications.
关键词
Y2O3-Al2O3-SiO2/透明微晶玻璃/碱金属氧化物/结构/析晶/维氏硬度Key words
Y2O3-Al2O3-SiO2/transparent glass-ceramics/alkali metal oxide/structure/crystallization/Vickers hardness引用本文复制引用
基金项目
硅酸盐国家重点实验室(武汉理工大学)开放基金(2011DA105356)
出版年
2024
国家科技期刊平台
NSTL
万方数据