Silicon-based bond coatings for environmental barrier coatings: Present status and prospective

IF 1.8 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS International Journal of Applied Ceramic Technology Pub Date : 2024-06-22 DOI:10.1111/ijac.14840

Jing-Chuan Luo, Wen-Qi Yang, Lin Chen, Guan-Jun Yang

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Abstract

Environmental barrier coatings (EBCs) are indispensable for the service of SiC-based turbine engines. The Si-bond coating is a critical layer that prevents oxidants from penetrating SiC substrates and determines the service lifetimes of EBCs. In this study, the oxidation behaviors and failure mechanisms of Si-based bond coatings were reviewed. The large growth rate and phase transformation of thermally grown oxides (TGOs, SiO₂) seriously deteriorate the service of Si-bond coatings. The low melting point of Si further limits its application in next-generation engines above 1 427°C. The results show that an isolated particle healing (IPH) treatment decreased the oxidation rate of the Si-bond coating by ∼24% at 1 300°C. Moreover, the Si–HfO₂ and Si-stabilizer (Si–Al₂O₃ or Si-mullite) composite/duplex bond coatings can eliminate SiO₂ phase transitions, thus improving the service lifetime. In addition, rare earth silicide (RESi), SiC and SiO₂–HfO₂ composite show potential for use in next-generation EBCs above 1 427°C. This review provides guidance for designing Si-based bond coatings with improved service lifetime.

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用于环境阻隔涂料的硅基粘结涂料：现状与前景

环境阻隔涂层（EBC）对于使用碳化硅的涡轮发动机来说是不可或缺的。硅键涂层是防止氧化剂渗入碳化硅基材的关键层，决定着 EBC 的使用寿命。本研究综述了硅键涂层的氧化行为和失效机理。热生长氧化物（TGOs，SiO2）的大生长率和相变严重恶化了硅键涂层的使用寿命。硅的低熔点进一步限制了它在 1427°C 以上的下一代发动机中的应用。研究结果表明，在 1 300°C 时，隔离颗粒愈合（IPH）处理可将硅键涂层的氧化率降低 24%。此外，Si-HfO2 和 Si-稳定剂（Si-Al2O3 或 Si-莫来石）的复合/双相键涂层可以消除 SiO2 相变，从而提高使用寿命。此外，稀土硅化物 (RESi)、SiC 和 SiO2-HfO2 复合材料也显示出在 1 427°C 以上的下一代 EBC 中使用的潜力。本综述为设计使用寿命更长的硅基键合涂层提供了指导。

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来源期刊

International Journal of Applied Ceramic Technology 工程技术-材料科学：硅酸盐

CiteScore

3.90

自引率

9.50%

发文量

280

审稿时长

4.5 months

期刊介绍： The International Journal of Applied Ceramic Technology publishes cutting edge applied research and development work focused on commercialization of engineered ceramics, products and processes. The publication also explores the barriers to commercialization, design and testing, environmental health issues, international standardization activities, databases, and cost models. Designed to get high quality information to end-users quickly, the peer process is led by an editorial board of experts from industry, government, and universities. Each issue focuses on a high-interest, high-impact topic plus includes a range of papers detailing applications of ceramics. Papers on all aspects of applied ceramics are welcome including those in the following areas: Nanotechnology applications; Ceramic Armor; Ceramic and Technology for Energy Applications (e.g., Fuel Cells, Batteries, Solar, Thermoelectric, and HT Superconductors); Ceramic Matrix Composites; Functional Materials; Thermal and Environmental Barrier Coatings; Bioceramic Applications; Green Manufacturing; Ceramic Processing; Glass Technology; Fiber optics; Ceramics in Environmental Applications; Ceramics in Electronic, Photonic and Magnetic Applications;