Bi2O3添加量对低熔点铋酸盐玻璃微观结构及热力学性能的影响
Journal: Building Development DOI: 10.12238/bd.v9i2.4372
Abstract
本文通过调控Bi2O3掺杂量(20–40mol%),采用传统熔炼淬火法制备了铋酸盐三元玻璃,结合X射线衍射(XRD)、拉曼光谱及差示扫描量热法,系统研究了玻璃网络结构演变及其对热稳定性能的影响机制。结果表明：随着Bi2O3含量增加,玻璃网络中高键能的[BO₃]与[BO₄]刚性结构逐渐被低键能的[BiO₃]和[BiO₆]结构取代,导致三维硼氧网络解聚,铋氧单元重构。热性能测试显示,玻璃化转变温度(Tg)从460℃降至354℃,初始析晶温度(Tx)从680℃降至440℃,热稳定性指标ΔT由220℃锐减至86℃,表明体系热稳定性显著下降。拉曼光谱进一步证实,Bi离子的高极化特性破坏了硼氧键,削弱网络连接强度,加剧析晶倾向并降低化学稳定性。本研究揭示了Bi2O3通过网络结构取代与极化效应调控玻璃热力学性能的本质机制,为低熔点铋酸盐玻璃的成分设计与性能优化提供了理论依据。
Keywords
铋酸盐三元玻璃；热力学性能；低熔点玻璃
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