TiAl合金表面电沉积SiO2 涂层抗循环氧化性能研究

doi:10.11902/1005.4537.2024.246

中国腐蚀与防护学报

2025, Vol. 45

Issue (1): 81-91 CSTR: 32134.14.1005.4537.2024.246 DOI: 10.11902/1005.4537.2024.246

研究报告

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TiAl合金表面电沉积SiO₂ 涂层抗循环氧化性能研究

严豪杰¹, 殷若展¹, 汪文君², 孙擎擎¹, 伍廉奎¹(

), 曹发和¹

1 中山大学材料学院深圳 518107
2 中国航发湖南动力机械研究所株洲 412002

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

引用本文:

严豪杰, 殷若展, 汪文君, 孙擎擎, 伍廉奎, 曹发和. TiAl合金表面电沉积SiO₂ 涂层抗循环氧化性能研究[J]. 中国腐蚀与防护学报, 2025, 45(1): 81-91.
Haojie YAN, Ruozhan YIN, Wenjun WANG, Qingqing SUN, Liankui WU, Fahe CAO. Cyclic Oxidation Behavior of TiAl Alloy with Electrodeposited SiO₂ Coating[J]. Journal of Chinese Society for Corrosion and protection, 2025, 45(1): 81-91.

全文: PDF(17855 KB) HTML

摘要:

针对TiAl合金在热循环环境中的抗氧化需求，本文采用电沉积方法在TiAl合金表面制备了SiO₂涂层，并研究了涂层在900 ℃下的抗循环氧化性能，分析了电沉积SiO₂涂层的失效机制。实验结果表明，电沉积SiO₂涂层可有效提高TiAl合金的抗循环氧化性能。SiO₂涂层可与TiAl基体发生反应生成 Ti₅Si₃，促进界面处选择性氧化生成Al₂O₃层，起到扩散阻挡作用。然而，由于SiO₂涂层与TiAl合金存在热失配问题，会导致涂层内热应力集中，从而萌生裂纹。裂纹为氧的向内扩散和基体元素的向外扩散提供了通道，在氧化膜表面形成大量团簇，导致了SiO₂涂层连续致密的结构遭到破坏，但SiO₂涂层循环氧化200 h后仍未发生剥落，说明其仍保持一定的高温防护能力。

关键词 ： TiAl合金, 电沉积SiO₂涂层, 循环氧化, 热应力

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

收稿日期: 2024-08-06 32134.14.1005.4537.2024.246

ZTFLH:

V254.2

基金资助:国家自然科学基金(52271084; 51971205);广东省基础与应用基础研究基金(2021B1515020056)

通讯作者: 伍廉奎，E-mail：wulk5@mail.sysu.edu.cn，研究方向为材料腐蚀与防护

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

作者简介: 严豪杰，男，1998年生，博士生

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https://www.jcscp.org/CN/10.11902/1005.4537.2024.246 或 https://www.jcscp.org/CN/Y2025/V45/I1/81

图1 电沉积SiO2涂层-TiAl基体二维有限元模型

表1 基体和涂层的物性参数

图2 电沉积SiO2涂层的表面形貌和截面形貌

图3 TiAl合金和电沉积SiO2涂层在900 ℃下的循环氧化动力学曲线

图4 TiAl合金和电沉积SiO2涂层900 ℃循环氧化100和200 h后的XRD图谱

图5 TiAl合金900 ℃循环氧化100 h后的表面形貌以及截面形貌及其元素面扫图

表2 图5中各点处EDS结果 (atomic fraction / %)

图6 电沉积SiO2涂层900 ℃循环氧化100 h后的表面形貌以及截面形貌及其元素面扫图

表3 图6中各点处EDS结果 (atomic fraction / %)

图7 电沉积SiO2涂层900 ℃循环氧化200 h后的表面形貌、截面形貌和元素面扫图

表4 图7中各点处EDS结果 (atomic fraction / %)

图8 电沉积SiO2涂层900 ℃循环氧化200 h后的XPS能谱

图9 电沉积SiO2涂层升温至900 ℃后X方向正应力σ11分布图，Y方向正应力σ22分布图，热应力分布图和典型节点的热应力数值柱状图

图10 电沉积SiO2涂层900 ℃循环氧化失效过程示意图

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