Tailorable Shielded Compliance of Thermal Barrier Coatings through Laser Texturing and Microstructural Modification: Microfeature Design and Validation
Tailorable Shielded Compliance of Thermal Barrier Coatings through Laser Texturing and Microstructural Modification: Microfeature Design and Validation
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DOI：
10.1016/j.jeurceramsoc.2023.02.035
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发表时间：
2023-02
影响因子：
5.7
通讯作者：
A. Bogatyrev;Z. Liao;D. Axinte;A. Norton
中科院分区：
文献类型：
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作者：
A. Bogatyrev;Z. Liao;D. Axinte;A. Norton
热障涂层 (TBC) 广泛用于保护组件免受恶劣环境和过高温度的影响。然而，面漆可能缺乏热顺应性和耐环境性，从而导致过早失效。本研究提供了一种设计、生产和评估新型屏蔽兼容 TBC 的方法，以应对这些挑战。面漆激光开槽可以降低热失配水平并阻碍裂纹扩展，而激光玻璃可以增强强度和防腐性能。对釉层的材料分析显示，与喷涂涂层相比，釉层具有大的柱状晶粒和无应力结构。数字图像相关（DIC）原位加热测试表明，玻璃安装后的垂直裂纹已经成为有效的应力消除特征，而受控凹槽显示出最突出的顺应性，正如有限元分析（FEA）所表明的那样。这样的概念可以应用于任何需要增加热顺应性或环境保护的涂层，使其成为高度通用的工具。
Thermal barrier coatings (TBCs) are widely used for protecting components from an aggressive environment and excessive temperatures. However, the top coat can lack thermal compliance and environmental resistance, promoting premature failure. This study provides an approach to design, produce, and evaluate the novel shielded-compliant TBCs to address these challenges. Top coat laser grooving can lower thermal mismatch levels and hinder crack propagation, whereas laser glazing can enhance strength and anti-corrosion performance. Material analysis for the glazed layer revealed large columnar grains alongside a stress-free structure compared to the as-sprayed coating. The digital image correlation (DIC) in-situ heating test showed vertical cracks after glazing already to be effective stress relief features, with the controlled grooves showing the most prominent compliance, as suggested by finite element analysis (FEA). Such a concept may be applied to any coating where increased thermal compliance or environmental protection is needed, making it a highly versatile tool.