Yb2O3改性硅黏结层的环境障涂层体系耐高温水氧腐蚀行为研究

doi:10.15541/jim20240411

摘要/Abstract

摘要：

稀土硅酸盐环境障涂层(EBCs)是应用于新一代高推重比航空发动机热端部件的重要材料。但在服役过程中, 硅黏结层的氧化和开裂是导致EBCs失效的重要因素。对硅黏结层进行改性成为延长EBCs服役寿命的重要手段。本研究在硅黏结层中掺杂Yb₂O₃来缓解高温水氧环境下涂层开裂的问题, 并提高其耐高温水氧腐蚀性能。通过真空等离子喷涂技术在SiC基体上制备了五种不同Yb₂O₃掺杂量(0、5%、10%、15%、20%, 体积分数)的EBCs体系(Si-Yb₂O₃)/Yb₂Si₂O₇/Yb₂SiO₅, 并研究其在1350 ℃下的耐水氧腐蚀行为和机理。结果表明, 掺杂适量(5%)的Yb₂O₃能够在高温水氧腐蚀过程中反应并消耗SiO₂, 减少SiO₂相变(β→α)带来的应力变化, 抑制混合热生长氧化(mTGO)层纵向裂纹的产生, 达到提高结构稳定性的效果。另外, 反应生成的Yb₂Si₂O₇具有合适的热膨胀系数(CTE)和化学相容性。然而, 随着Yb₂O₃掺杂量提高, 过量的Yb₂O₃会在黏结层内部相互联结并形成“骨架”结构, 为氧化性物质提供向涂层内部扩散的直接通道, 使黏结层内部发生腐蚀, 导致涂层体系耐水氧腐蚀性能下降。

关键词: 环境障涂层, 水氧腐蚀, 黏结层改性, 真空等离子喷涂

Abstract:

Rare earth silicate environmental barrier coatings (EBCs) are important materials that can be applied to hot sections for the new generation of high thrust-to-weight ratio aero engines. However, oxidation and cracking of the silicon bond layer are significant factors leading to failure during service. Modifying the silicon bond layer has become an important method to extend EBCs’ service life. In this work, Yb₂O₃ was doped in the silicon bond layer to mitigate cracking under high-temperature water vapor conditions, as well as to improve its corrosion resistance. Five kinds of EBC systems (Si-Yb₂O₃)/Yb₂Si₂O₇/Yb₂SiO₅ with different Yb₂O₃ doping (0, 5%, 10%, 15%, 20%, in volume) were prepared on SiC substrates using vacuum plasma spraying technology. Their water-oxygen corrosion behavior was studied, and mechanisms at 1350 ℃ beneath their behavior were revealed. The results indicated that doping an appropriate amount (5%) of Yb₂O₃ into silicon effectively facilitates the reaction with SiO₂and its subsequent consumption during high-temperature water vapor corrosion. This process reduces the stress variations associated with SiO₂ phase transition (β → α) and inhibits formation of longitudinal cracks in mixed thermal growth oxide (mTGO) layer, thus enhancing structural stability. Furthermore, the reaction product of Yb₂Si₂O₇ exhibits a suitable coefficient of thermal expansion (CTE) and chemical compatibility. Notably, increasing Yb₂O₃ content results in formation of interconnected "skeleton" structure within the bond layer, which may provide a direct pathway for oxidizing substances to permeate into the interior of coating, thereby facilitating corrosion process within the bond layer, and ultimately diminishing the water vapor corrosion resistance of EBC systems.

Key words: environmental barrier coating, water vapor corrosion, modified bond layer, vacuum plasma spray

中图分类号:

TQ174

梁锐辉, 钟鑫, 洪督, 黄利平, 牛亚然, 郑学斌. Yb₂O₃改性硅黏结层的环境障涂层体系耐高温水氧腐蚀行为研究[J]. 无机材料学报, 2025, 40(4): 425-432.

LIANG Ruihui, ZHONG Xin, HONG Du, HUANG Liping, NIU Yaran, ZHENG Xuebin. High-temperature Water Vapor Corrosion Behaviors of Environmental Barrier Coatings with Yb₂O₃-modified Silicon Bond Layer[J]. Journal of Inorganic Materials, 2025, 40(4): 425-432.

图/表 10

图1 水氧腐蚀实验示意图

Fig. 1 Schematic diagram of water vapor corrosion experiment

图2 不同EBCs经1350 ℃水氧腐蚀前后的宏观形貌

Fig. 2 Macroscopic morphologies of different EBCs before and after water vapor corrosion at 1350 ℃

图3 Si/YbDS/YbMS涂层体系经1350 ℃水氧腐蚀前后的截面微观形貌

Fig. 3 Cross-sectional micromorphologies of Si/YbDS/YbMS EBCs before and after water vapor corrosion at 1350 ℃ (a, b) As-sprayed; (c, d) 100 h; (e, f) 200 h

表1 图3~图5中不同衬度区域EDS元素分析结果(%, in atom)

Table 1 EDS element analysis results (%, in atom) for different contrast regions in Fig. 3-Fig. 5

Sample site	Si	Yb	O
Point 1	40.30	\	59.70
Point 2	18.47	15.54	65.99
Point 3	30.95	11.28	57.77
Point 4	24.00	17.80	58.20
Point 5	100.00	\	\

图4 S5Yb/YbDS/YbMS涂层体系经1350 ℃水氧腐蚀后的截面微观形貌((c)中插图为相应的EDS元素分析)

Fig. 4 Cross-sectional micromorphologies of S5Yb/YbDS/YbMS EBCs after water vapor corrosion at 1350 ℃ with inserts in (c) showing corresponding EDS element analysis (a-c) 100 h; (d, e) 200 h

图5 S10Yb/YbDS/YbMS涂层体系经1350 ℃水氧腐蚀后的截面微观形貌

Fig. 5 Cross-sectional micromorphologies of S10Yb/YbDS/YbMS EBCs after water vapor corrosion at 1350 ℃ (a, b) 100 h; (c-e) 200 h

图6 S15Yb/YbDS/YbMS涂层体系经1350 ℃水氧腐蚀后的截面微观形貌

Fig. 6 Cross-sectional micromorphologies of S15Yb/YbDS/YbMS EBCs after water vapor corrosion at 1350 ℃ (a-c) 100 h; (d-f) 200 h

图7 S20Yb/YbDS/YbMS涂层体系经1350 ℃水氧腐蚀后的截面微观形貌

Fig. 7 Cross-sectional micromorphologies of S20Yb/YbDS/YbMS EBCs after water vapor corrosion at 1350 ℃ (a-c) 100 h; (d-f) 200 h

图8 经100、200 h水氧腐蚀后的TGO和mTGO层厚度

Fig. 8 Thickness of TGO and mTGO layers after water vapor corrosion for 100 and 200 h

图9 腐蚀性物质在SxYb涂层中的扩散行为

Fig. 9 Diffusion behavior of corrosive substances in SxYb coating

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Yb₂O₃改性硅黏结层的环境障涂层体系耐高温水氧腐蚀行为研究

High-temperature Water Vapor Corrosion Behaviors of Environmental Barrier Coatings with Yb₂O₃-modified Silicon Bond Layer

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