Abstract

A series of lithium aluminosilicate glasses with the composition of 70SiO₂–10Al₂O₃–5K₂O–15Li₂O–xNaCl (x = 0.5, 1.5, 2.5, 3.5 and 4.5 wt %) were prepared by the melt-quenching method. The effect of NaCl addition on mechanical properties was assessed. It was found that both the glass density and the hardness decreased with increasing content of NaCl from 0.5 to 3.5 wt %. Interestingly, Vickers hardness of the glass increased when NaCl content increased by 4.5 wt %. Raman test results show that NBO/T in the glass increases with NaCl, that is, the decrease of the degree of polymerization of the glass network due to the breaking of Si–O–Si bonds. Since the Si–O–Si covalent bond is the strongest bond in the silicate glass, the glass structure tends to be depolymerized, and the density and Vickers hardness decrease. Thus, we attribute the hardness increasing at 4.5 wt % NaCl addition to the fact that Na⁺ enters the network pores acting as network modifier.

中文翻译：

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Na+离子对锂铝硅酸盐玻璃力学性能的影响

摘要

采用熔融淬火法制备了一系列组成为 70SiO ₂ –10Al ₂ O ₃ –5K ₂ O–15Li ₂ O– x NaCl ( x = 0.5, 1.5, 2.5, 3.5 和 4.5 wt%) 的锂铝硅酸盐玻璃。方法。评估了 NaCl 添加对机械性能的影响。结果发现，随着 NaCl 含量从 0.5 wt% 增加到 3.5 wt%，玻璃密度和硬度均降低。有趣的是，当 NaCl 含量增加 4.5 wt% 时，玻璃的维氏硬度增加。拉曼测试结果表明，玻璃中的NBO/T随着NaCl的增加而增加，即由于Si-O-Si键的断裂而导致玻璃网络的聚合度降低。由于Si-O-Si共价键是硅酸盐玻璃中最强的键，玻璃结构容易解聚，密度和维氏硬度下降。因此，我们将添加 4.5 wt% NaCl 时硬度的增加归因于 Na ⁺进入网络孔充当网络改性剂的事实。