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首页> 外文期刊>CERAMICS INTERNATIONAL >Hot corrosion resistance of air plasma sprayed ceramic Sm2SrAl2O7 (SSA) thermal barrier coatings in simulated gas turbine environments
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Hot corrosion resistance of air plasma sprayed ceramic Sm2SrAl2O7 (SSA) thermal barrier coatings in simulated gas turbine environments

机译：喷气等离子体喷涂陶瓷SM2SRAL2O7（SSA）热阻挡涂层的热耐腐蚀性，模拟燃气轮机环境

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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 50 wt% Na2SO4 + 50 wt% V2O5 and 90 wt% Na2SO4 + 5 wt% V2O5 + 5 wt% NaCl) for two different temperatures of 700 and 900 degrees C. A developed SSA TBCs showed about 8% and 22% lower lifetime at 700 and 900 degrees C, respectively than YSZ TBCs in 50 wt% Na2SO4 + 50 wt% V2O5 (vanadate). The hot corrosion life of SSA TBCs being found about 13% and 39% lower than YSZ TBCs in 90 wt% Na2SO4 + 5 wt% V2O5 + 5 wt% NaCl (chloride) at 700 and 900 degrees C, respectively. X-ray diffraction results showed the formation of SmVO4, SrV2O6 and SrSO4 as a major hot corrosion product in 50 wt% Na2SO4 + 50 wt% V2O5 and 90 wt% Na2SO4 + 5 wt% V2O5 + 5 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 900 degrees 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 900 degrees 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 degrees C mainly due to the formation of a stable Ni3V2O8 phase at the surface.
机译：使用空气等离子体喷涂工艺在少数粘结涂覆的Inconel 718超高合金基板上显造钐锶（SM2SRAL2O7-SSA）和氧化钇稳定的氧化锆（YSZ）热阻挡涂层（TBCS）。在模拟的燃气轮机环境中进行热腐蚀研究（熔融混合物50wt％Na 2 SO 4 + 50wt％V2O5和90wt％Na 2 SO 4 + 5wt％V2O5 + 5wt％NaCl，两种不同的温度为700和900摄氏度。显影的SSA TBC在50wt％Na 2 SO 4 + 50wt％V2O5（钒酸盐）中分别显示在700和900摄氏度下的寿命约为8％和22％。 SSA TBC的热腐蚀寿命分别在700和900摄氏度下分别在90wt％Na 2 SO 4 + 5wt％V2O5 + 5wt％NaCl（氯）中低于YSZ TBC的13％和39％。 X射线衍射结果显示SMVO4，SRV2O6和SRSO4分别在50wt％Na 2 SO 4 + 50wt％V2O5和90wt％Na 2 SO 4 + 5wt％V2O5 + 5wt％NaCl环境中形成SMVO 4，SRV2O6和SRSO4，分别用于SSA TBC 。类似地，YSZ TBC也显示YVO4作为钒酸盐和氯化物环境中的热腐蚀产物。在900摄氏度下，TBC在氯化物环境中遭受更严重的热腐蚀攻击。来自SSA和YSZ的SR2 +和Y3 +离子的浸出分别在700和900摄氏度下的钒酸盐和氯化物环境中的漂移中发挥着至关重要的作用。在SSA和YSZ TBC中，与在氯化物环境存在下粘合涂层涂层界面的氯离子攻击相比，离子的浸出具有显着低的影响。 SSA TBCs的热腐蚀性在900摄氏度下在钒酸盐环境中提高了3倍，主要是由于在表面形成稳定的Ni3v2O8相。

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