Lu-Si-O体系在高温水蒸气环境中的腐蚀行为

doi:10.3724/SP.J.1077.2010.00186

摘要/Abstract

摘要：

采用溶胶-凝胶法制得三种镥硅酸盐体系粉体材料. 以氧化物的摩尔比来表示此三种粉体, 分别为：Lu₂O₃·SiO₂、Lu₂O₃·2SiO₂和Lu₂O₃·2.26SiO₂. 在1400℃、50%H₂O-50%O₂静态常压气氛下, 研究了它们的耐水蒸气腐蚀性能.以单位面积重量变化率表征材料的耐水蒸气腐蚀性能, 结合X射线衍射（XRD）、傅里叶红外光谱（FTIR）和扫描电镜能谱分析（SEMEDS）等分析手段, 揭示了镥硅酸盐体系在高温水蒸气环境中的腐蚀机制和反应机理. 结果表明：三种原始粉体主要物相依次为：Lu₂SiO₅+Lu₂Si₂O₇、 Lu₂Si₂O₇+SiO₂和Lu₂Si₂O₇+SiO₂. 在水蒸气作用下, Lu₂SiO₅相与Al₂O₃反应生成新相Lu₃Al₅O₁₂, 而Lu₂Si₂O₇相并未受到水蒸气的作用而发生任何反应, 表现出优异的化学稳定性.

关键词: Lu₂SiO₅, Lu₂Si₂O₇, 环境障碍涂层, 水蒸气腐蚀

Abstract:

Three kinds of lutetium silicates powders were prepared by solgel method, marked by Lu₂O₃·SiO₂, Lu₂O₃·2SiO₂ and Lu₂O₃·2.26SiO₂, respectively. Their corrosion behavior in water vapor was investigated in 50%H₂O-50%O₂ steam environment with a total pressure of 1.01×10⁵Pa at 1400℃. The specific weight change as a function of corrosion time was recorded. The phase evolution of lutetium silicate at different corrosion stages was observed by X-ray diffraction. The bonds of samples after corroded for different times were characterized by fourier transform infrared spectroscope(FTIR). The composition of corroded samples was analyzed by EDS. The results show that the main crystal phases of the as-prepared samples are Lu₂SiO₅+Lu₂Si₂O₇, Lu₂Si₂O₇+SiO₂ and Lu₂Si₂O₇+SiO₂, respectively. Lu₂SiO₅, instead of Lu₂Si₂O₇, reacts with Al₂O₃ to form garnet phase (Lu₃Al₅O₁₂) in the water vapor environment. This indicates that Lu₂Si₂O₇ exhibits more excellent chemical stability than Lu₂SiO₅.

Key words: Lu₂SiO₅, Lu₂Si₂O₇, environmental barrier coating (EBC), water vapor corrosion

中图分类号:

TB323

洪智亮,成来飞,鲁琳静,张立同,王一光. Lu-Si-O体系在高温水蒸气环境中的腐蚀行为[J]. 无机材料学报, DOI: 10.3724/SP.J.1077.2010.00186.

HONG Zhi-Liang,CHENG Lai-Fei,LU Lin-Jing,ZHANG Li-Tong,WANG Yi-Guang. Corrosion Behavior of Lu-Si-O System in Water Vapor[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2010.00186.

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