In-situ high-temperature SAXS/WAXS Investigation of dental lithium disilicate glass ceramics under different environments

This project investigates crystallization and sinterability of lithium disilicate (Li₂Si₂O₅) glass-ceramics produced via fusion casting and powder pressing. Using in situ time-resolved synchrotron WAXS/SAXS over 12 shifts, we target to track phase evolution from glass to crystalline state, focusing on lithium metasilicate (Li₂SiO₃) nucleation, transient lithium orthophosphate (Li₃PO₄), and Li₂Si₂O₅ growth. Samples tested under air and vacuum will reveal how chemistry and thermal routes affect microstructure and densification. The study aims to quantify nucleation kinetics, crystal growth, and sintering behavior, providing insights to optimize glass-ceramic processing for dental applications.

本研究针对通过熔铸与粉末压制工艺制备的二硅酸锂（lithium disilicate, Li₂Si₂O₅）玻璃陶瓷的结晶行为与烧结性能展开探究。实验借助12次实验班次的原位时间分辨同步辐射广角X射线散射（wide-angle X-ray scattering, WAXS）/小角X射线散射（small-angle X-ray scattering, SAXS）技术，追踪玻璃相向晶态转变的相演化过程，重点关注偏硅酸锂（lithium metasilicate, Li₂SiO₃）的形核、暂态原磷酸锂（lithium orthophosphate, Li₃PO₄）的生成以及二硅酸锂晶体的生长过程。本研究分别在空气与真空环境下对样品进行测试，以揭示化学组成与热工艺路径对材料微观结构及致密化行为的影响机制。本研究旨在量化形核动力学、晶体生长与烧结行为，为优化牙科用玻璃陶瓷的制备工艺提供理论参考。