Corrosion Behavior of AlPO4 as Environmental Barrier Coating in Water Vapor Enviroment

doi:10.3724/SP.J.1077.2009.00397

Abstract

Abstract: AlPO₄ was synthesized by a Sol-Gel method. Its coefficient of thermal expansion (CTE) was measured by dilatometer. Its corrosion behavior was tested in an environment of 50vol%H₂O/50vol%O₂ with a flow rate of 0.085cm/s at 1350℃. The phases and composition of the samples were analyzed by X-ray diffraction and Energy Dispersive Spectroscope. The microstructures of AlPO₄ were characterized by Scanning Electron Microscope. The results indicate that the CTE of AlPO₄ matches with that of C/SiC composites and its corrosion resistance is much better than that of SiC. However, the decomposition of AlPO₄ at high temperatures is the main problem in the water vapor enviroment， which will be accelerated in combination with silica.

Key words: environmental barrier coating, AlPO₄, compatibility, water vapor corrosion

CLC Number:

TB323

CHEN Xian-Hong,CHENG Lai-Fei,WANG Yi-Guang,ZHANG Li-Tong,HONG Zhi-Liang,WU Ya-Hui. Corrosion Behavior of AlPO₄ as Environmental Barrier Coating in Water Vapor Enviroment[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2009.00397.

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Corrosion Behavior of AlPO₄ as Environmental Barrier Coating in Water Vapor Enviroment

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