Corrosion Resistance of Air Plasma Sprayed Thermal Barrier Coating SrZrO3 on Superalloy In718 against CaO-MgO-Al2O3-SiO2 (CMAS)

doi:10.11902/1005.4537.2016.170

Journal of Chinese Society for Corrosion and protection

2017, Vol. 37

Issue (1): 53-57 DOI: 10.11902/1005.4537.2016.170

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Corrosion Resistance of Air Plasma Sprayed Thermal Barrier Coating SrZrO₃ on Superalloy In718 against CaO-MgO-Al₂O₃-SiO₂ (CMAS)

Shanrong ZHANG^1,²,Hongying DONG^1,²,Wen MA^2,³(

),Yichuan YIN^2,³,Xinhui LI^2,³,Yu BAI^2,³,Ruiling JIA^2,³

1 School of Chemical 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 Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, China

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Abstract

SrZrO₃ powders were synthesized by solid-state reaction and then spray granulation. The SrZrO₃ coating on superalloy In718 was prepared by air plasma spray (APS). The corrosion behavior of the SrZrO₃ coated alloy beneath a thin deposit of CMAS (CaO-MgO-Al₂O₃-SiO₂) was examined in air at 1150 and 1250 ^oC for 1, 4 and 12 h respectively, while the reaction of powder mixture of SrZrO₃ and CMAS was investigated paralell. The corrosion products of SrZrO₃ powders and the microstructure of SrZrO₃ coating after corrosion were characterized by XRD and SEM, respectively. The reaction between the two powders of SrZrO₃ and CMAS did not occur at 1150 ^oC, whereas occurred at 1250 ^oC for 1 h, which resulted in the formation of corrosion products of ZrSiO₄, CaZrO₃, SrAl₂O₄ and t-ZrO₂, and then a new phase of m-ZrO₂ did additionally appear for 4 h corrosion. The corrosion product of t-ZrO₂ was formed on the SrZrO₃ coating surface after CMAS attack, and the phase transition from t-ZrO₂ to m-ZrO₂ occurred as the corrosion time increased, the formation of the corrosion products could suppress the further corrosion of the SrZrO₃ coating by CMAS.

Key words: air plasma spray thermal barrier coating CMAS SrZrO₃

Received: 18 September 2016

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

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	Shanrong ZHANG
	Hongying DONG
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	Yichuan YIN
	Xinhui LI
	Yu BAI
	Ruiling JIA

Cite this article:

Shanrong ZHANG,Hongying DONG,Wen MA,Yichuan YIN,Xinhui LI,Yu BAI,Ruiling JIA. Corrosion Resistance of Air Plasma Sprayed Thermal Barrier Coating SrZrO₃ on Superalloy In718 against CaO-MgO-Al₂O₃-SiO₂ (CMAS). Journal of Chinese Society for Corrosion and protection, 2017, 37(1): 53-57.

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https://www.jcscp.org/EN/10.11902/1005.4537.2016.170 OR https://www.jcscp.org/EN/Y2017/V37/I1/53

Table 1 Spray parameters for bond coat and top coat

Fig.1 XRD patterns of spray dried SrZrO₃ powder andas-sprayed SrZrO₃coating

Fig.2 XRD patterns of the mixture of SrZrO₃ and CMAS powders after heat treatment for 1 h at 1150 and 1250 ℃

Fig.3 XRD patterns of the mixture of SrZrO₃ and CMAS powders after heat treatment at 1250 ℃ for 1, 4 and 12 h

Fig.4 Cross-sectional SEM images of SrZrO₃ coating after CMAS corrosion for 1 h at 1150 ℃ (a) and 1250 ℃ (b), as well as element mappings of Ca (c), Mg (d), Al (e) and Si (f) in Fig.4b

Fig.5 Cross-sectional SEM images of SrZrO₃ coatings after CMAS corrosion at 1250 ℃ for 1 h (a, b), 4 h (c, d) and 12 h (e, f)

Fig.6 EDS analysis of the spherical particles in the corrosion layers in Fig.5b (a), Fig.5d (b) and Fig.5f (c), respectively

Fig.7 Thickness of corrosion layer of SrZrO₃ TBCs as a function of time at 1250 ℃

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