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Microstructure evolution and hot corrosion mechanisms of Ba<sub>2</sub>REAlO<sub>5</sub> (RE = Yb, Er, Dy) exposed to V<sub>2</sub>O<sub>5</sub> + Na<sub>2</sub>SO<sub>4</sub> molten salt

Author:
Lei Guo  Chenglong Zhang  Qing He  Jianxing Yu  Zheng Yan  Fuxing Ye  Chengyi Dan  Vincent Ji  


Journal:
Journal of the European Ceramic Society


Issue Date:
2018


Abstract(summary):

Abstract Ba 2 REAlO 5 (RE = Dy, Er, Yb) powders were synthesized by a solid state reaction method, followed by cold pressing and sintering to produce pellets for hot corrosion tests. When exposed to V 2 O 5  + Na 2 SO 4 molten salt at 900 °C and 1000 °C for 4 h and 20 h, REVO 4 , Ba 3 (VO 4 ) 2 and BaAl 2 O 4 formed as corrosion products due to chemical interactions between the ceramics and the molten salt, which were temperature and time independent. After the hot corrosion tests at 1000 °C, continuous, dense reaction layers with a thickness of ∼80 μm formed on the sample surfaces, which had an effective function on suppressing further penetration of the molten salt. The hot corrosion mechanisms of Ba 2 REAlO 5 are proposed based on Lewis acid-base rule, phase diagrams and thermodynamics. From a thermodynamics perspective, the molten salt directly reacting with Ba 2 REAlO 5 is difficult compared with Yb 2 O 3 , Al 2 O 3 and BaO.


Page:
3555-3555


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