Corrosion Resistance of (Gd0.7Sr0.3)ZrO3.35 Coating against CaO-MgO-Al2O3-SiO2 (CMAS)

doi:10.11902/1005.4537.2016.171

Journal of Chinese Society for Corrosion and protection

2017, Vol. 37

Issue (1): 47-52 DOI: 10.11902/1005.4537.2016.171

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Corrosion Resistance of (Gd_0.7Sr_0.3)ZrO_3.35 Coating against CaO-MgO-Al₂O₃-SiO₂ (CMAS)

Lili CAI^1,²,Wen MA^1,²(

),Xinhui LI^1,²,Yichuan YIN^1,²,Bole MA^1,²,Yu BAI^1,²,Jun WANG^1,²,Hongying DONG^2,³

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

(Gd_0.7Sr_0.3)ZrO_3.35 coating was prepared on superalloy In718 by air plasma spray (APS). The corrosion behavior of (Gd_0.7Sr_0.3)ZrO_3.35 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 (Gd_0.7Sr_0.3)ZrO_3.35 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 (Gd_0.7Sr_0.3)ZrO_3.35 coating had better resistance against CMAS corrosion. The corrosion products formed between CMAS and (Gd_0.7Sr_0.3)ZrO_3.35 coating during the corrosion process consists of apatite Ca₂Gd₈(SiO₄)₆O₂ and c-ZrO₂, which can effectively protect the (Gd_0.7Sr_0.3)ZrO_3.35 coating from further attack by CMAS.

Key words: thermal barrier coating (Gd_0.7Sr_0.3)ZrO_3.35 coating CMAS apatite

Received: 18 September 2016

Fund: Supported by National Natural Science Foundation of China (51462026 and 51672136) and Inner Mongolia Natural Science Foundation (2014MS0509)

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	Lili CAI
	Wen MA
	Xinhui LI
	Yichuan YIN
	Bole MA
	Yu BAI
	Jun WANG
	Hongying DONG

Cite this article:

Lili CAI,Wen MA,Xinhui LI,Yichuan YIN,Bole MA,Yu BAI,Jun WANG,Hongying DONG. Corrosion Resistance of (Gd_0.7Sr_0.3)ZrO_3.35 Coating against CaO-MgO-Al₂O₃-SiO₂ (CMAS). Journal of Chinese Society for Corrosion and protection, 2017, 37(1): 47-52.

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https://www.jcscp.org/EN/10.11902/1005.4537.2016.171 OR https://www.jcscp.org/EN/Y2017/V37/I1/47

Fig.1 Cross-sectional micrographs of (Gd_0.7Sr_0.3)ZrO_3.35 coating after CMAS attack at 1250 ℃for 1 h (a), 4 h (b), 8 h (c) and 12 h (d) and the magnified images of the reaction zones near the coating in Fig.1c (e) and Fig.1d (f)

Fig.2 Cross section (a) and elemental mappings of Mg (b), Si (c), Ca (d), Zr (e) and Al (f) of (Gd_0.7Sr_0.3)ZrO_3.35 coating after CMAS attack at 1250 ℃ for 12 h

Fig.3 XRD patterns of (Gd_0.7Sr_0.3)ZrO_3.35 powders and its as-sprayed coating

Fig.4 XRD patterns of the mixture of (Gd_0.7Sr_0.3)ZrO_3.35 and CMAS powders after heat-treatment at 1250 ℃ for 1 h (a), 4 h (b), 8 h (c) and 12 h (d)

Fig.5 High-magnification cross-sectional micrographs of (Gd_0.7Sr_0.3)ZrO_3.35 coating after CMAS attack at 1250 ℃for 1 h (a), 4 h (b), 8 h (c) and 12 h (d) and EDS results of positions I (e), II (f), III (g) and IV (h)

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