Co-improvements of chemical stability and glass transition temperature via a mixed alkali effect in low-melting Li2O-Na2O-CaO-P2O5 sealing glasses

IF 3.2 3区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of Non-crystalline Solids Pub Date : 2024-11-12 DOI:10.1016/j.jnoncrysol.2024.123309

Huali Liu , Shiquan Liu , Junfeng Kang , Yunlong Yue , Xuchuan Jiang

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引用次数: 0

Abstract

Enhanced chemical stability and reduced glass transition temperature are surely desirable for the low-melting sealing glasses. An elusive trade-off between the glass transition temperature and chemical durability in the phosphate glass systems, however, greatly limits the applications of low-melting sealing glasses. In this work, the co-improvements of chemical stability and glass transition temperature are achieved in the xLi₂O-(25-x)Na₂O-17CaO-58P₂O₅ glass system (0 ≤ x ≤ 20 mol%) via a mixed-alkali effect, and this effect on the glasses structures, thermal properties and chemical stability were systematically investigated. The FTIR, Raman and XPS spectra showed that the replacement of Na₂O with Li₂O will enhance and cross-link the glassy network. Particularly, the significantly reduced glass transition temperature (T_g∼331 °C) and softening temperature (T_s∼366 °C) were achieved in the glass with an optimized 10 mol% substitution of Li₂O, demonstrating a great potential of such the mixed-alkali-modulated glasses in the low-temperature sealing applications.

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通过混合碱效应共同提高低熔点 Li2O-Na2O-CaO-P2O5 密封玻璃的化学稳定性和玻璃化转变温度

对于低熔点密封玻璃来说，增强化学稳定性和降低玻璃化转变温度无疑是最理想的。然而，磷酸盐玻璃体系在玻璃化转变温度和化学耐久性之间难以权衡，极大地限制了低熔点密封玻璃的应用。本研究通过混合碱效应，在 xLi2O-(25-x)Na2O-17CaO-58P2O5 玻璃体系（0 ≤ x ≤ 20 mol%）中实现了化学稳定性和玻璃化转变温度的共同提高，并系统研究了这种效应对玻璃结构、热性能和化学稳定性的影响。傅立叶变换红外光谱、拉曼光谱和 XPS 光谱显示，用 Li2O 替代 Na2O 会增强和交联玻璃网络。尤其是在 Li2O 取代量为 10 mol% 的优化玻璃中，玻璃转变温度（Tg∼331 °C）和软化温度（Ts∼366 °C）明显降低，显示了这种混合碱调制玻璃在低温密封应用中的巨大潜力。

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来源期刊

Journal of Non-crystalline Solids 工程技术-材料科学：硅酸盐

CiteScore

6.50

自引率

11.40%

发文量

576

审稿时长

35 days

期刊介绍： The Journal of Non-Crystalline Solids publishes review articles, research papers, and Letters to the Editor on amorphous and glassy materials, including inorganic, organic, polymeric, hybrid and metallic systems. Papers on partially glassy materials, such as glass-ceramics and glass-matrix composites, and papers involving the liquid state are also included in so far as the properties of the liquid are relevant for the formation of the solid. In all cases the papers must demonstrate both novelty and importance to the field, by way of significant advances in understanding or application of non-crystalline solids; in the case of Letters, a compelling case must also be made for expedited handling.