High-temperature oxidation and TGO growth behavior of Sr.9(Zr.9Yb.05Y.05)O2.85 thermal barrier coatings

IF 1.8 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS International Journal of Applied Ceramic Technology Pub Date : 2024-07-18 DOI:10.1111/ijac.14870

Xueying Feng, Min Zou, Jiong Liu, Liang Lv, Xiangfeng Meng, Yu Bai, Fei Zheng, Li Yu, Wen Ma, Yuanming Gao

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Abstract

High-temperature oxidation (1050°C) of Sr_.9(Zr_.9Yb_.05Y_.05)O_2.85 (SZYY) thermal barrier coatings (TBCs) by suspension plasma spraying (SPS) and growth behavior of thermally grown oxide (TGO) were investigated. When the TBCs were exposed to high temperature for a period of time (∼5 h), the BC oxidized and TGO inevitably formed between the bond coating (BC) and the ceramic top coating (TC). The high-temperature oxidation behavior of the BC is generally manifested as the growth of TGO, which has four specific stages as follows: (1) formative oxidation stage (0‒10 h), (2) rapid oxidation stage (10‒50 h), (3) stable oxidation stage (50‒100 h), and (4) complex oxidation stage (100‒200 h). The main component of early TGO is α-Al₂O₃. It has a very low oxygen ion diffusivity and provides an excellent diffusion barrier, which has a positive effect on preventing further BC oxidation. However, as the heat treatment time increased, the Al consumption and the formation of a CNS layer (NiO, Co₃O₄, and spinel) in the BC eventually led to coating failure. The working life of TBCs can be improved by improving the ceramic TC structure and the Al content of BC. SZYY-TBCs have certain potential application value.

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Sr.9(Zr.9Yb.05Y.05)O2.85 隔热涂层的高温氧化和 TGO 生长行为

研究了通过悬浮等离子喷涂（SPS）技术对 Sr.9(Zr.9Yb.05Y.05)O2.85（SZYY）热障涂层（TBC）进行高温氧化（1050°C）的情况以及热生长氧化物（TGO）的生长行为。当 TBC 暴露在高温下一段时间（∼5 h）后，BC 氧化，TGO 不可避免地在粘结涂层（BC）和陶瓷面涂层（TC）之间形成。BC 的高温氧化行为一般表现为 TGO 的生长，具体分为以下四个阶段：(1) 形成氧化阶段（0-10 小时）；(2) 快速氧化阶段（10-50 小时）；(3) 稳定氧化阶段（50-100 小时）；(4) 复杂氧化阶段（100-200 小时）。早期 TGO 的主要成分是 α-Al2O3。它具有极低的氧离子扩散率，提供了极好的扩散屏障，对防止 BC 进一步氧化有积极作用。然而，随着热处理时间的延长，铝的消耗和 BC 中 CNS 层（NiO、Co3O4 和尖晶石）的形成最终导致涂层失效。通过改进陶瓷 TC 结构和 BC 中的铝含量，可以提高 TBC 的工作寿命。SZYY-TBC 具有一定的潜在应用价值。

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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;