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
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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