کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8948440 | 1645668 | 2018 | 14 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Hot corrosion resistance of air plasma sprayed ceramic Sm2SrAl2O7 (SSA) thermal barrier coatings in simulated gas turbine environments
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Hot corrosion resistance of air plasma sprayed ceramic Sm2SrAl2O7 (SSA) thermal barrier coatings in simulated gas turbine environments Hot corrosion resistance of air plasma sprayed ceramic Sm2SrAl2O7 (SSA) thermal barrier coatings in simulated gas turbine environments](/preview/png/8948440.png)
چکیده انگلیسی
Samarium strontium aluminate (Sm2SrAl2O7-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 50â¯wt% Na2SO4 + 50â¯wt% V2O5 and 90â¯wt% Na2SO4 + 5â¯wt% V2O5 + 5â¯wt% NaCl) for two different temperatures of 700 and 900â¯Â°C. A developed SSA TBCs showed about 8% and 22% lower lifetime at 700 and 900â¯Â°C, respectively than YSZ TBCs in 50â¯wt% Na2SO4 +â¯50â¯wt% V2O5 (vanadate). The hot corrosion life of SSA TBCs being found about 13% and 39% lower than YSZ TBCs in 90â¯wt% Na2SO4 +â¯5â¯wt% V2O5 +â¯5â¯wt% NaCl (chloride) at 700 and 900â¯Â°C, respectively. X-ray diffraction results showed the formation of SmVO4, SrV2O6, and SrSO4 as a major hot corrosion product in 50â¯wt% Na2SO4 +â¯50â¯wt% V2O5 and 90â¯wt% Na2SO4 +â¯5â¯wt% V2O5 +â¯5â¯wt% NaCl environments respectively for SSA TBCs. Similarly, YSZ TBCs also showed YVO4 as hot corrosion product in vanadate and chloride environments. Both the TBCs suffer a more severe hot corrosion attack in chloride environment at 900â¯Â°C. The leaching of Sr2+ and Y3+ ions from SSA and YSZ respectively play a vital role in the destabilization of coating in vanadate and chloride environments at 700 and 900â¯Â°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 900â¯Â°C mainly due to the formation of a stable Ni3V2O8 phase at the surface.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 44, Issue 15, 15 October 2018, Pages 17695-17708
Journal: Ceramics International - Volume 44, Issue 15, 15 October 2018, Pages 17695-17708
نویسندگان
T. Baskaran, Shashi Bhushan Arya,