Study On Thermal Stability of Al₂O₃-ZrO₂ Composite Membranes

Hao Yanxia, Yang Xujie, Lu Lude, Wang Xin
(Chem. Eng. Sch.,Nanjing University of Science and Technology, Nanjing 210094)

Abstract Al₂O₃-ZrO₂ composite membranes were prepared by sol-gel process from aluminium iso-propoxide and zirconyl chloride as their precursors. The thermal stability, structure and appearance of composite membranes were characterized by thermogravimetric analysis and differential thermal analysis (TGA-DTA), X-ray diffraction (XRD), Fourier transform infrared spectroscope (FT-IR), scanning electron microscopy (SEM) and transmission electron micrographs (TEM), respectively. The results show that the thermal stability of composite membranes is better than those of pure Al₂O₃ or ZrO₂ membranes. The crystal phase of composite membranes is tetragonal ZrO₂ until 1100℃, but monoclinic ZrO₂ and alpha Al₂O₃ appear at 1200℃. Investigation with SEM showed that the membranes were defect-free.
Key words Sol-gel method, Al₂O₃-ZrO₂ composite membrane, Thermal stability

Al₂O₃-ZrO₂复合膜的热稳定性研究

郝艳霞 杨绪杰 陆路德 汪 信^*
(南京理工大学化工学院 南京 210094)

摘要 以异丙醇铝和氯化氧锆为原料，用溶胶-凝胶法制备了Al₂O₃-ZrO₂复合膜。应用TG、DTA、XRD、FT-IR、SEM、TEM等测试手段对复合膜的热稳定性、结构、形貌进行了表征。结果表明复合膜的热稳定性比单一由氧化铝或氧化锆制成的膜有显著地提高；在1100℃以下，复合膜以t-ZrO₂存在，1200℃时，出现了m-ZrO₂和α-Al₂O₃相。扫描电镜分析表明，膜表面完整、无缺陷。
关键词 溶胶-凝胶法 Al₂O₃-ZrO₂复合膜 热稳定性