Cyclic Oxidation Behavior of TiAl Alloy with Electrodeposited SiO2 Coating

doi:10.11902/1005.4537.2024.246

Journal of Chinese Society for Corrosion and protection

2025, Vol. 45

Issue (1): 81-91 DOI: 10.11902/1005.4537.2024.246

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Cyclic Oxidation Behavior of TiAl Alloy with Electrodeposited SiO₂ Coating

YAN Haojie¹, YIN Ruozhan¹, WANG Wenjun², SUN Qingqing¹, WU Liankui¹(

), CAO Fahe¹

1 School of Materials, Sun Yat-sen University, Shenzhen 518107, China
2 AECC Hunan Aviation Powerplant Research Institute, Zhuzhou 412002, China

Cite this article:

YAN Haojie, YIN Ruozhan, WANG Wenjun, SUN Qingqing, WU Liankui, CAO Fahe. Cyclic Oxidation Behavior of TiAl Alloy with Electrodeposited SiO₂ Coating. Journal of Chinese Society for Corrosion and protection, 2025, 45(1): 81-91.

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Abstract

To improve the oxidation resistance of TiAl alloy in the thermal cycling environment, SiO₂ coating was electrodeposited on the surface of a vacuum cast γ-TiAl alloy. The cyclic oxidation behavior of the SiO₂ coating/TiAl alloy in air at 900 ^oC was studied, with each cycle consists of oxidation at 900 ^oC for 50 min and cooling to room temperature for 10 min. The failure mechanism of the electrodeposited SiO₂ coating was analyzed. Results showed that the electrodeposited SiO₂ coating can effectively improve the cyclic oxidation resistance of TiAl alloy. Furthermore, the SiO₂ coating can react with the TiAl substrate to form Ti₅Si₃ and promote the selective oxidation of TiAl to form an Al₂O₃ scale, which acts as a diffusion barrier. However, due to the thermal mismatch between the SiO₂ coating and TiAl alloy, thermal stress concentration in the coating will lead to the initiation of cracks. The cracks provide channels for the inward diffusion of oxygen and the outward diffusion of matrix elements, resulting in the generation of a large number of clusters on the surface of the oxide scale, thus destroying the continuous and dense structure of the SiO₂ coating. However, no spallation can be observed on the SiO₂ coating after cyclic oxidation for 200 h, indicating that the SiO₂ coating still maintains a certain high temperature protection ability.

Key words: TiAl alloy electrodeposited SiO₂ coating cyclic oxidation thermal stress

Received: 06 August 2024 32134.14.1005.4537.2024.246

ZTFLH:

V254.2

Fund: National Natural Science Foundation of China(52271084; 51971205);Guangdong Basic and Applied Basic Research Foundation(2021B1515020056)

Corresponding Authors: WU Liankui, E-mail: wulk5@mail.sysu.edu.cn

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	YAN Haojie
	YIN Ruozhan
	WANG Wenjun
	SUN Qingqing
	WU Liankui
	CAO Fahe

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https://www.jcscp.org/EN/10.11902/1005.4537.2024.246 OR https://www.jcscp.org/EN/Y2025/V45/I1/81

Fig.1 Two-dimensional finite element model of electrodeposited SiO₂ coating and TiAl substrate: (a) physical geometry model, (b) overall mesh of model

Table 1 Physical properties of the substrate and coating materials

Fig.2 Surface (a, b) and cross-sectional (c) SEM images of electrodeposited SiO₂ coating

Fig.3 Cyclic oxidation kinetic curves of TiAl alloy and SiO₂ coating in static air at 900 ^oC (a), and enlarged view of cyclic oxidation kinetic curve of SiO₂ coating (b)

Fig.4 XRD patterns of TiAl alloy (a) and electrodeposited SiO₂ coating (b, c) after cyclic oxidation at 900 ^oC for 100 h (a, b) and 200 h (c)

Fig.5 Surface morphology (a) and enlarged views of the marked zones (b, c), and cross-sectional morphologies (d, f) and corresponding element mappings (e, g) for TiAl alloy after cyclic oxidation at 900 ^oC for 100 h

Table 2 EDS results of the positions marked in Fig.5

Fig.6 Surface morphologies (a, b), and cross-sectional morphology (c) and corresponding EDS element mappings (d) of electrodeposited SiO₂ coating after cyclic oxidation at 900 ^oC for 100 h

Table 3 EDS results of the positions marked in Fig.6

Fig.7 Surface morphology (a) and enlarged views of the marked zones (b, c), and cross-sectional morphologies (d, f) and corresponding element mappings (e, g) for electrodeposited SiO₂ coating after cyclic oxidation at 900 ^oC for 100 h

Table 4 EDS results of the positions marked in Fig.7

Fig.8 Survey (a) and high-resolution XPS peaks of Si 2p (b), Ti 2p (c), Al 2p (d), and O 1s (e) of electrodeposited SiO₂ coating after cyclic oxidation at 900 ^oC for 200 h

Fig.9 Distributions of X-direction normal stress σ₁₁ (a), Y-direction normal stress σ₂₂ (b) and thermal stress (c), and numerical histogram of thermal stress at typical nodes (d) in electrodeposited SiO₂ coating after heating up to 900 ^oC

Fig.10 Schematic diagrams of failure process of electrodeposited SiO₂ coating during cyclic oxidation at 900 ^oC: (a) the initail oxidation stage, (b) crack generated in the coating, (c) oxide generated on the coating

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