玻璃陶瓷属于一类多晶陶瓷材料.通过调整玻璃基质和晶相组成可以制备出具有良好的力学、热学、电学和光学性能的玻璃陶瓷材料.采用传统的熔融和退火技术制备出含B2O3-Al2O3-SiO2-Li2O-K2O组分的硼铝硅玻璃,并通过成核和长晶工艺最终制备出透明玻璃陶瓷.配合料在铂金坩埚中于1450℃下熔融2h,然后经两步热处理制度控制晶核的生成和晶粒的长大.采用差热分析技术确定成核和长晶温度.采用X射线衍射技术对不同热处理制度下的玻璃陶瓷样品进行分析,以确定最佳成核和长晶条件.采用扫描电子显微镜分析玻璃陶瓷形态,晶粒尺寸及其在残余玻璃相中的分布.采用UV-Vis-Nir分光光度计测定玻璃陶瓷样品的透过率.
Glass-ceramics belong to a class of polycrystalline ceramic materials. Depending on the glass matrix and the special crystal phases, one can obtain materials with improved mechanical, thermal, electrical, or optical properties. Boron aluminum silicate glass containing B2O3-Al2O3-SiO2-Li2O-K2O was prepared by conventional melt and quenching technique, and subsequently converted to transparent glass-ceramics by controlled nucleation and crystallization. Glass was melted in a platinum crucible at 1450℃ for 2h and then two-step heat treatments for the nucleation and the crystal growth. The nucleation and crystallization temperatures were determined by differential thermal analysis (DTA). Specimens heat-treated at various durations were analyzed by the X-ray diffraction (XRD) to determine the optimum conditions for nucleation and the crystal growth. Scanning electron microscopy (SEM) was used to study the glass-ceramics morphology, the grain size and distribution in the residual glass matrix. The transmittance was measured by UV-Vis-Nir scanning spectrophotometer.
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