ZnO·Al2O3·nSiO2玻璃抗裂纹萌生能力反常演化的结构起源探索

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (11): 4067-4074.

所属专题：玻璃

• 新型功能玻璃与玻璃新技术、新结构 • 上一篇下一篇

ZnO·Al₂O₃·nSiO₂玻璃抗裂纹萌生能力反常演化的结构起源探索

徐美姿, 王兵兵, 顾少轩, 黄欣, 陶海征

武汉理工大学硅酸盐建筑材料国家重点实验室,武汉 430070

收稿日期:2022-04-20 修订日期:2022-06-07 出版日期:2022-11-15 发布日期:2022-12-12
通信作者: 陶海征,博士,教授。E-mail:thz@whut.edu.cn
作者简介:徐美姿(1996—),女,硕士研究生。主要从事氧化物玻璃力学性能的研究。E-mail:740225106@qq.com
基金资助:
国家自然科学基金(52172007)

Structural Origin Revealing of Abnormal Evolution of Crack Initiation Resistance in ZnO·Al₂O₃·nSiO₂ Glasses

XU Meizi, WANG Bingbing, GU Shaoxuan, HUANG Xin, TAO Haizheng

State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China

Received:2022-04-20 Revised:2022-06-07 Online:2022-11-15 Published:2022-12-12

摘要/Abstract

摘要： 为探究ZnO·Al₂O₃·nSiO₂玻璃抗裂纹萌生能力(C_R)随SiO₂含量变化的演化规律,制备了一系列不同n值(n=2,2.35,2.5,2.65,3,3.5)的样品。基于C_R和结构表征发现,C_R随着n的增加呈先增大后减小的反常演化,并于n=2.5时出现极值(31.1 N)。这是源于随着n增大:(1)原子堆积份数逐渐减小,可致密化体积逐渐增加,从而导致C_R逐步提高;(2)Al—O多面体结构单元含量逐步减少,导致C_R逐步下降;(3)考虑到相界面对裂纹生长的强阻挡能力,中程异构分相(富Al和富Si相)致相界面数量呈先增多后减少的变化趋势,导致C_R产生类似的非单调演化。上述三个因素的竞争和协同作用是该体系中C_R呈反常演化的结构起源,但考虑到极值点附近较小的组分变化,中程异构致相界面数量随n增加呈现的非单调演变才应是C_R呈反常演化的主要结构根源。

关键词: 锌铝硅酸盐玻璃, 抗裂纹萌生能力, 玻璃结构, 原子堆积份数, Al—O多面体, 相界面

Abstract: To explore the evolution law of crack initiation resistance (C_R) in ZnO·Al₂O₃·nSiO₂ (n=2, 2.35, 2.5, 2.65, 3, 3.5) glasses varies with SiO₂ content, series of glass samples were prepared by the conventional melt-quenching method. By characterizing C_R and the microstructure of these aluminosilicate glasses in detail, the results shows that an abnormal evolution that C_R increases first and then decreases with the increase of SiO₂ content, and arrives the maximum value of 31.1 N at n=2.5. With the increase of n: (1) the atomic packing density decreases gradually, which induces the increase in C_R due to the increase in volume available for densification; (2) the quantity of Al—O polyhedra decreases, which leads to the drop in C_R due to the higher damage resistance of Al—O polyhedra compared to the SiO₄ units; (3) considering the strong retarding upon crack initiation originated from phase interfaces, the non-monotonic change in the quantity of phase interfaces induces the corresponding abnormal evolution in C_R for the aluminosilicate glasses. The competition and synergy of the above three factors are the structural origin of the abnormal evolution of C_R in this system. Finally, considering the insignificant change in composition near the maximum value, the non-monotonic change in the quantity of phase interfaces varies with n should be the main structual origin of the abnormal evolution in C_R.

Key words: zinc aluminosilicate glass, crack initiation resistance, glass structure, atomic packing density, Al—O polyhedron, phase interface

中图分类号:

TQ171

徐美姿, 王兵兵, 顾少轩, 黄欣, 陶海征. ZnO·Al₂O₃·nSiO₂玻璃抗裂纹萌生能力反常演化的结构起源探索[J]. 硅酸盐通报, 2022, 41(11): 4067-4074.

XU Meizi, WANG Bingbing, GU Shaoxuan, HUANG Xin, TAO Haizheng. Structural Origin Revealing of Abnormal Evolution of Crack Initiation Resistance in ZnO·Al₂O₃·nSiO₂ Glasses[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(11): 4067-4074.

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ZnO·Al₂O₃·nSiO₂玻璃抗裂纹萌生能力反常演化的结构起源探索

Structural Origin Revealing of Abnormal Evolution of Crack Initiation Resistance in ZnO·Al₂O₃·nSiO₂ Glasses

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