Plasticity, crack initiation and defect resistance in alkali-borosilicate glasses: From normal to anomalous behavior
Plasticity, crack initiation and defect resistance in alkali-borosilicate glasses: From normal to anomalous behavior
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DOI：
10.1016/j.jnoncrysol.2015.02.019
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发表时间：
2015-06
影响因子：
3.5
通讯作者：
R. Limbach;A. Winterstein-Beckmann;J. Dellith;D. Möncke;L. Wondraczek
中科院分区：
文献类型：
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作者：
R. Limbach;A. Winterstein-Beckmann;J. Dellith;D. Möncke;L. Wondraczek
我们全面描述了硼硅酸钠玻璃在急剧接触负载下的缺陷容限。这是由于这种特殊的玻璃系统在各种应用中发挥的关键作用，从电子基板、显示器盖和用于生物医学成像和传感的基板到放射性废物玻璃化等。本报告涵盖了 Na2O-B2O3-SiO2 三元玻璃的机械性能，涵盖了从纯 SiO2 到二元硼酸钠的各种成分，并跨越了各种商业相关的特种硼硅酸盐玻璃的领域，例如多组分 Duran、Pyrex 和 BK7 型成分以及典型的钠钙硅酸盐玻璃，这些玻璃也包括在本研究中。在结构方面，所考虑的玻璃可分为两类，即，一组仅包含桥接氧原子，另一组设计有越来越多的非桥接氧离子。评估了弹性模量、泊松比、硬度以及抗蠕变性和抗裂性，以及致密化对压痕变形总量的贡献。讨论了近程和中程有序的机械性能和结构特征之间的相关性，从中我们获得了控制整个变形反应并最终控制接触裂纹的分子反应的机械观点。
We provide a comprehensive description of the defect tolerance of sodium-borosilicate glasses upon sharp contact loading. This is motivated by the key role which is taken by this particular glass system in a wide variety of applications, ranging from electronic substrates, display covers and substrates for biomedical imaging and sensing to, eg, radioactive waste vitrification. The present report covers the mechanical properties of glasses in the Na2O–B2O3–SiO2 ternary over the broad range of compositions from pure SiO2 to binary sodium-borates, and crossing the regions of various commercially relevant specialty borosilicate glasses, such as the multi-component Duran-, Pyrex-and BK7-type compositions and typical soda-lime silicate glasses, which are also included in this study. In terms of structure, the considered glasses may be separated into two groups, that is, one series which contains only bridging oxygen atoms, and another series which is designed with an increasing number of non-bridging oxygen ions. Elastic moduli, Poisson ratio, hardness as well as creep and crack resistance were evaluated, as well as the contribution of densification to the overall amount of indentation deformation. Correlations between the mechanical properties and structural characteristics of near-and mid-range order are discussed, from which we obtain a mechanistic view at the molecular reactions which govern the overall deformation reaction and, ultimately, contact cracking.