Spreading and Corrosion Behavior of CMAS Melt on Different Materials for Thermal Barrier Coating

doi:10.11902/1005.4537.2022.362

Journal of Chinese Society for Corrosion and protection

2023, Vol. 43

Issue (6): 1407-1412 DOI: 10.11902/1005.4537.2022.362

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Spreading and Corrosion Behavior of CMAS Melt on Different Materials for Thermal Barrier Coating

QU Weiwei¹^,², CHEN Zehao³, PEI Yanling⁴, LI Shusuo²(

), WANG Fuhui³

^1.AECC Shenyang Engine Research Institute, Shenyang 110015, China
^2.Research Institute of Aero-Engine, Beihang University, Beijing 100191, China
^3.Shenyang National Laboratory for Materials Science, Northeastern University, Shenyang 110819, China
^4.Research Institute for Frontier Science, Beihang University, Beijing 100191, China

Cite this article:

QU Weiwei, CHEN Zehao, PEI Yanling, LI Shusuo, WANG Fuhui. Spreading and Corrosion Behavior of CMAS Melt on Different Materials for Thermal Barrier Coating. Journal of Chinese Society for Corrosion and protection, 2023, 43(6): 1407-1412.

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Abstract

The coating failure of blades caused by low melting point silicate composed of CaO,MgO,Al₂O₃,SiO₂ has been widely concerned for an aero-engine in service. Therefore, the spreading and corrosivity of CMAS melt on five ceramic materials, i.e. Y₂O₃,La₂Ce₂O₇,Gd₂Zr₂O₇,Al₂O₃ and 12YSHf, as candidate materials for thermal barrier coatings, was assessed in air at 1250 ^oC for 16 h, in comparison with 7YSZ, the commonly used ceramic material. It can be found that 12YSHf and Al₂O₃ show good effect in slowing down the spreading of CMAS melt. In addition, the high temperature reaction interfaces of CMAS/Al₂O₃ and CMAS/La₂Ce₂O₇ are all thinner than the others, which means that Al₂O₃ and La₂Ce₂O₇ have better resistance to CMAS. Overall, the effect of Al₂O₃ in retarding the spreading and corrosion of CMAS is the most outstanding.

Key words: CMAS melt materials for thermal barrier coating spreading behavior hot corrosion behavior

Received: 22 November 2022 32134.14.1005.4537.2022.362

ZTFLH:

TG174

Fund: Natural Science Foundation of Liaoning Province(2022-MS-104);China Postdoctoral Science Foundation(ZX20230009)

Corresponding Authors: LI Shusuo, E-mail: lishs@buaa.edu.cn

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	QU Weiwei
	CHEN Zehao
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	LI Shusuo
	WANG Fuhui

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https://www.jcscp.org/EN/10.11902/1005.4537.2022.362 OR https://www.jcscp.org/EN/Y2023/V43/I6/1407

Table 1 Basic information about ceramic samples

Fig.1 DSC curves of CMAS mixed powders (a) and shrinkage factors of CMAS cylinder on various oxide ceramics during heating (b)

Fig.2 Variations of cosine of contact angle of CMAS melt on various test ceramics with temperature

Fig.3 XRD patterns of different ceramics with CMAS deposit after treatment at 1250 ℃ for 16 h

Fig.4 Cross-sectional morphologies of the reaction layers of different ceramic samples with CMAS deposit after treatment at 1250 ℃ for 16 h: (a) YSZ, (b) YSHf, (c) Al₂O₃, (d) LCO, (e) GZO, (f) Y₂O₃

Fig.5 Atomic fraction of Ca (a), Mg (b), Al (c) and Si (d) in the different distances from the reaction layers of various ceramic samples

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