Shaanxi Key Laboratory of Biomedical Metallic Materials, Northwest Institute for Non-ferrous Metal Research, Xi'an, 710016, China.
State Key Laboratory for Manufacturing Systems Engineering, School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an, 710049, China.
J Mech Behav Biomed Mater. 2023 Jan;137:105563. doi: 10.1016/j.jmbbm.2022.105563. Epub 2022 Nov 10.
Multi-component lithium disilicate (LD) glasses were ion-exchanged in a pure or mixed nitrate salt bath. The surface morphologies, mechanical properties, chemical stability and ion leaching of ion-exchanged LD glasses before and after storage in artificial saliva for 21 days were investigated. It can be found that chemical stability of ion-exchanged LD glass was temperature-dependent. The residual compressive stress induced by ion-exchange increased the chemical potential of alkali ions in glass, and the ion-exchanged LD glass, especially 235 °C/64 h group, chemical stability in artificial saliva for 21 days were deteriorated. Back-exchange treatment could relax the stress on the outermost layer of the ion-exchanged LD glass without deteriorating its strengthening effect, and back-exchanged LD glass presented good chemical and mechanical stability in artificial saliva. The results might help to enhance the service stability of ion-exchanged LD glass-ceramics in the oral condition.
多组分锂硅玻璃在纯硝酸盐或混合硝酸盐浴中进行离子交换。研究了在人工唾液中储存 21 天后，离子交换前后的锂硅玻璃的表面形貌、力学性能、化学稳定性和离子浸出。可以发现，离子交换锂硅玻璃的化学稳定性是温度依赖性的。离子交换产生的残余压应力增加了玻璃中碱离子的化学势，离子交换的 LD 玻璃，特别是 235°C/64h 组，在人工唾液中 21 天的化学稳定性恶化。反向交换处理可以在不降低其强化效果的情况下，松弛离子交换 LD 玻璃最外层的应力，反向交换的 LD 玻璃在人工唾液中表现出良好的化学和力学稳定性。研究结果有助于提高离子交换 LD 玻璃陶瓷在口腔环境下的使用稳定性。
