Hot-corrosion behavior of a La2Ce2O7/YSZ thermal barrier coating exposed to Na2SO4+V2O5 or V2O5 salt at 900°C

Sulfate‐vanadate hot corrosion of neodymium cerate/yttria stabilized zirconia composite coating

“…The molar ratio (Mol. %) of corrosive salts, V 2 O 5 and Na 2 SO 4 , used in most of the research works is 1:1 or closer to it . In the present work, 50% V 2 O 5 + 50% Na 2 SO 4 was selected for hot corrosion test.…”

“…The molar weights of V 2 O 5 and Na 2 SO 4 salts were mixed and crushed using a ball mill with 10 mm stainless steel balls and axial back and forth movement for 2 hours. The salts mixture with 10‐35 mg/cm 2 concentration had been used in the hot corrosion studies . In the present study, 30 mg/cm 2 corrosive concentration was selected to carry out the accelerated hot corrosion within 60 hours of exposure time.…”

“…The test temperature of 950°C was chosen after extended literature survey. Researchers have used 900‐1100°C as test temperature . During hot corrosion, after every successive 10 hours, one sample was taken out of furnace and corroded surface and the cross‐sectional regions were observed using stereomicroscope, optical microscope, and SEM (JEOL JSM 5910LV, Tokyo, Japan).…”

Cyclic Hot Corrosion Failure Behaviors of EB-PVD TBC Systems in the Presence of Sulfate and Vanadate Molten Salts

“…However, in top coating materials other than YSZ, such as Gd 2 Zr 2 O 7 and Ta 2 O 5 , failures were observed in the form of spallations rather than rod-shaped formations like YVO 4 [1,6,16,21]. When Wang et al [31] investigated La 2 Ce 2 O 7 /YSZ thermal barrier double layer coatings, hot corrosion molten salts penetrated into the microcolumnar gap and reacted with La element. After the reaction of molten salt with La element, the top coating microstructure of La 2 Ce 2 O 7 deteriorated because of the formation of CeVO 4 and LaVO 4 .…”

“…In comparison with La2Ce2O7, YSZ was not affected by the chemical reaction of molten salts. La 2 Ce 2 O 7 stopped the progression of corrosive salts to YSZ [31]. Xu and others [32] used rare earth zirconates La 2 Zr 2 O 7 and La 2 (Zr 0.7 Ce 0.3 ) 2 O 7 to produce TBCs with EB-PVD method.…”