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- W2809767661 abstract "Abstract Samarium strontium aluminate (Sm 2 SrAl 2 O 7 -SSA) and Yttria-stabilized zirconia (YSZ) thermal barrier coatings (TBCs) were developed on NiCrAlY bond coated Inconel 718 superalloy substrate using air plasma spray process. The hot corrosion study was conducted in simulated gas turbine environments (molten mixtures of 50 wt% Na 2 SO 4 + 50 wt% V 2 O 5 and 90 wt% Na 2 SO 4 + 5 wt% V 2 O 5 + 5 wt% NaCl) for two different temperatures of 700 and 900 °C. A developed SSA TBCs showed about 8% and 22% lower lifetime at 700 and 900 °C, respectively than YSZ TBCs in 50 wt% Na 2 SO 4 + 50 wt% V 2 O 5 (vanadate). The hot corrosion life of SSA TBCs being found about 13% and 39% lower than YSZ TBCs in 90 wt% Na 2 SO 4 + 5 wt% V 2 O 5 + 5 wt% NaCl (chloride) at 700 and 900 °C, respectively. X-ray diffraction results showed the formation of SmVO 4 , SrV 2 O 6 , and SrSO 4 as a major hot corrosion product in 50 wt% Na 2 SO 4 + 50 wt% V 2 O 5 and 90 wt% Na 2 SO 4 + 5 wt% V 2 O 5 + 5 wt% NaCl environments respectively for SSA TBCs. Similarly, YSZ TBCs also showed YVO 4 as hot corrosion product in vanadate and chloride environments. Both the TBCs suffer a more severe hot corrosion attack in chloride environment at 900 °C. The leaching of Sr 2+ and Y 3+ ions from SSA and YSZ respectively play a vital role in the destabilization of coating in vanadate and chloride environments at 700 and 900 °C. In both SSA and YSZ TBCs, the leaching of ion has significantly low influence as compared to attack by chloride ions at the bond coat-top coat interface in the presence of chloride environment. The hot corrosion resistance of SSA TBCs was improved three times higher in the presence of MgO and NiO inhibitor in vanadate environment at 900 °C mainly due to the formation of a stable Ni 3 V 2 O 8 phase at the surface." @default.
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- W2809767661 date "2018-10-01" @default.
- W2809767661 modified "2023-10-06" @default.
- W2809767661 title "Hot corrosion resistance of air plasma sprayed ceramic Sm2SrAl2O7 (SSA) thermal barrier coatings in simulated gas turbine environments" @default.
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- W2809767661 doi "https://doi.org/10.1016/j.ceramint.2018.06.234" @default.
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