Effect of MgF2 Additive on Preparation and Optical Properties of MgAl1.9Ga0.1O4 Transparent Ceramics
Source abstract
Abstract
MgF 2 助剂对 MgAl 1.9 Ga 0.1 O 4 透明陶瓷的制备与光学性能 影响1,2 (1.武汉理工大学 材料复合新技术国家重点实验室，武汉 430070; 2. 湖北隆中实验室，武汉理工大学襄阳示范区， 襄阳 441000) 摘 要: MgAl1.9Ga0.1O4透明陶瓷具有优异的光学性能，其制备有赖于高质量坯体的凝胶注模成型和长时间的无压预 烧。本研究选择MgF2 为烧结助剂、通过瞬时液相调节无压预烧的致密化过程。采用干压成型、无压预烧和热等静 压处理制备了不同样品尺寸的MgAl1.9Ga0.1O4透明陶瓷，并系统分析了MgF2 对材料显微结构、光学和机械性能的 影响。研究表明：MgF2 在~1230 ℃熔化形成液相促使陶瓷致密度与晶粒尺寸增大，在后续烧结过程中残留的MgF2 氧化为MgO并固溶进入MgAl1.9Ga0.1O4晶格。添加质量分数 0.20% MgF2 的 2 mm厚透明陶瓷样品在紫外和可见光区 域具有 76.5%~83.4%的直线透过率和较高的光学质量。此外，该陶瓷的特征抗弯强度为(167.1±1.2) MPa、与细晶 MgAl2O4 透明陶瓷相近，但是Weibull模数(8.81±0.29)更高。本研究为制备光学性能良好的大尺寸MgAl1.9Ga0.1O4透 明陶瓷提供了新的选择。
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OpenAlex topics: Microwave Dielectric Ceramics Synthesis · Ferroelectric and Piezoelectric Materials · Advanced ceramic materials synthesis
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