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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Effect of thermal history and chemical composition on hardness of silicate glasses
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Effect of thermal history and chemical composition on hardness of silicate glasses

机译：热历史和化学成分对硅酸盐玻璃硬度的影响

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摘要

The prediction of hardness is possible for crystalline materials, but not possible for glasses so far. In the present paper, we describe and discuss several important factors that should be used for predicting the hardness of glasses. To do so, we have studied the influences of thermal history and chemical composition on hardness of silicate glasses. By subjecting E-glasses of different compositions to various degrees of annealing, it is found that hardness decreases with the fictive temperature. Addition of Na2O to a SiO2-Al2O3-Na2O glass system causes a decrease in hardness. However, the number of non-bridging oxygen per tetrahedron (NBO/T) is not the only parameter determining hardness. In addition, it is found that the effect of ionic radius on hardness is opposite for alkali and alkaline earth ions. Hence, changes of the structural network occurring at the atomic scale must be taken into account when predicting the effect of composition on hardness. The principles used in the calculation of hardness of crystalline materials are only partly valid for glasses.
机译：硬度的预测对于结晶材料是可能的，但到目前为止对于玻璃是不可能的。在本文中，我们描述和讨论了一些可用于预测玻璃硬度的重要因素。为此，我们研究了热历史和化学成分对硅酸盐玻璃硬度的影响。通过使不同组成的电子玻璃经受不同程度的退火，发现硬度随虚拟温度降低。将Na 2 O添加到SiO 2 -Al 2 O 3 -Na 2 O玻璃体系中导致硬度降低。但是，每个四面体的非桥连氧原子数（NBO / T）并不是决定硬度的唯一参数。另外，发现对于碱金属离子和碱土金属离子，离子半径对硬度的影响是相反的。因此，在预测组成对硬度的影响时，必须考虑原子尺度上发生的结构网络变化。用于计算晶体材料硬度的原理仅对玻璃部分有效。

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