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Corrosion Resistance of (Gd0.7Sr0.3)ZrO3.35 Coating against CaO-MgO-Al2O3-SiO2 (CMAS) |
Lili CAI1,2,Wen MA1,2(),Xinhui LI1,2,Yichuan YIN1,2,Bole MA1,2,Yu BAI1,2,Jun WANG1,2,Hongying DONG2,3 |
1 School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, China 2 Inner Mongolia Key Laboratory of Thin Film and Coatings Technology, Inner Mongolia University of Technology, Hohhot 010051, China 3 School of Chemical Engineering, Inner Mongolia University of Technology, Hohhot 010051, China |
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Abstract (Gd0.7Sr0.3)ZrO3.35 coating was prepared on superalloy In718 by air plasma spray (APS). The corrosion behavior of (Gd0.7Sr0.3)ZrO3.35 coated alloy beneath a deposit of 30 mg/cm2 CMAS was examined in air at 1250 ℃for 1, 4, 8 and 12 h, respectively. While the reaction of the powder mixture of (Gd0.7Sr0.3)ZrO3.35 and CMAS was also studied parallel. The phase constitutes and microstructures of the corrosion products were characterized by XRD and SEM, respectively. The results showed that the (Gd0.7Sr0.3)ZrO3.35 coating had better resistance against CMAS corrosion. The corrosion products formed between CMAS and (Gd0.7Sr0.3)ZrO3.35 coating during the corrosion process consists of apatite Ca2Gd8(SiO4)6O2 and c-ZrO2, which can effectively protect the (Gd0.7Sr0.3)ZrO3.35 coating from further attack by CMAS.
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Received: 18 September 2016
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Fund: Supported by National Natural Science Foundation of China (51462026 and 51672136) and Inner Mongolia Natural Science Foundation (2014MS0509) |
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