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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   

  1. 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   

  1. 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: 为探究ZnO·Al2O3·nSiO2玻璃抗裂纹萌生能力(CR)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CR和结构表征发现,CR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CR逐步提高;(2)Al—O多面体结构单元含量逐步减少,导致CR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CR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CR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CR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 (CR) 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 CR and the microstructure of these aluminosilicate glasses in detail, the results shows that an abnormal evolution that CR 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 CR due to the increase in volume available for densification; (2) the quantity of Al—O polyhedra decreases, which leads to the drop in CR 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 CR for the aluminosilicate glasses. The competition and synergy of the above three factors are the structural origin of the abnormal evolution of CR 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 CR.

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

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