超重力熔铸Y2O3-Al2O3-SiO2玻璃的晶化行为研究

研究了以超重力熔铸方法制备的Y₂O₃-Al₂O₃-SiO₂玻璃的晶化行为, 并结合相图分析了热处理条件对晶化过程的影响规律。实验结果表明, Y₂O₃-Al₂O₃-SiO₂玻璃的晶化行为与热处理温度和SiO₂含量密切相关。当热处理温度为1050℃时, 晶化后样品的相组成沿超重力场方向呈现出梯度分布, 自上而下分别为Al₆Si₂O₁₃玻璃陶瓷、纯玻璃相、χ-Al₂O₃玻璃陶瓷。当退火温度为1100℃时, 析出晶相主要为Y₃Al₅O₁₂及Y₂Si₂O₇; 退火温度为1200℃时主要析出Y₃Al₅O₁₂。因此, 以超重力熔铸法制备YAS玻璃结合后续热处理的工艺, 提供了一种快速制备YAS基微晶玻璃的新方法。

Investigation on Crystallization Behavior of Y2O3-Al2O3-SiO2 Glass Prepared by High-gravity Combustion Synthesis

The crystallization behavior of Y₂O₃-Al₂O₃-SiO₂ glass prepared by high-gravity combustion synthesis was investigated by isothermal annealing experiments. The effect of annealing condition on the crystallization behavior of the glass was discussed according to the Y₂O₃-Al₂O₃-SiO₂ ternary phase diagram. From experimental results, the crystallization behavior of the glass strongly depended on the annealing temperature and the content of SiO₂. After being annealed at 1050℃, the sample showed a graded phase distribution along the high-gravity direction, consisting of Al₆Si₂O₁₃ glass-ceramic, pure glass and χ-Al₂O₃ glass-ceramic. At annealing temperature of 1100℃, Y₃Al₅O₁₂ and Y₂Si₂O₇ were precipitated as the major crystalline phases. When the annealing temperature further increased to 1200℃, the predominant crystalline phase was Y₃Al₅O₁₂. The research provides a possible way to prepare Y₂O₃-Al₂O₃-SiO₂ glass-ceramics by integrating high-gravity combustion synthesis with post annealing treatment.