The crack formation, propagation and healing mechanisms of plasma sprayed multi-layer thermal/environmental barrier coatings during heat treatment

IF 6.2 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society Pub Date : 2025-09-02 DOI:10.1016/j.jeurceramsoc.2025.117793

Gui Li , Jiayan Li , Longhui Deng , Jianing Jiang , Yan Huang , Shujuan Dong , Wenbo Chen , Ying Xiong , Yixing Zhang , Min Li , Wenjun Wang , Xueqiang Cao

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引用次数: 0

Abstract

Si/Yb₂Si₂O₇-Yb₂SiO₅/Yb₂SiO₅/LaMgAl₁₁O₁₉ thermal and environmental barrier coatings (TEBCs) were fabricated on the SiC_f/SiC using atmospheric plasma spraying. The thermal stability of coating was evaluated by thermogravimetric-differential scanning calorimetery. The phase and microstructure evolution of coating was investigated at 950 ℃-1350 ℃ to study the crack propagation and healing mechanisms of TEBCs during heat-treatment. Porosities and crack width of coating were characterized. The crystallization behavior and phase transformation were also investigated. The results indicated that viscous flow, phase transformation and solid-state sintering could be contributed to the crack healing in the TEBCs but the crack healing is limited. The formation of vertical crack in TEBCs is caused by bridging of crack in each layer. The crack continued to propagate and widen due to the release of thermal mismatch stress. The optimized heat treatment is about 1200 ℃, due to ratio of crack width to porosity of coating is lower than other temperature.

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等离子喷涂多层热/环境屏障涂层热处理过程中裂纹的形成、扩展和愈合机制

采用常压等离子喷涂技术在SiCf/SiC上制备了Si/Yb2Si2O7-Yb2SiO5/Yb2SiO5/LaMgAl11O19热障和环境障涂层。采用热重-差示扫描量热法评价了涂层的热稳定性。在950℃-1350℃温度下，研究涂层的相和组织演变，研究tebc在热处理过程中的裂纹扩展和愈合机制。对涂层的孔隙率和裂纹宽度进行了表征。研究了其结晶行为和相变。结果表明，黏性流动、相变和固相烧结都有助于TEBCs的裂纹愈合，但裂纹愈合是有限的。tebc中垂直裂缝的形成是由各层裂缝的桥接引起的。由于热失配应力的释放，裂纹继续扩展和变宽。由于涂层的裂纹宽度与孔隙率之比低于其他温度，优化热处理温度为1200℃左右。

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来源期刊

Journal of The European Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

10.70

自引率

12.30%

发文量

863

审稿时长

35 days

期刊介绍： The Journal of the European Ceramic Society publishes the results of original research and reviews relating to ceramic materials. Papers of either an experimental or theoretical character will be welcomed on a fully international basis. The emphasis is on novel generic science concerning the relationships between processing, microstructure and properties of polycrystalline ceramics consolidated at high temperature. Papers may relate to any of the conventional categories of ceramic: structural, functional, traditional or composite. The central objective is to sustain a high standard of research quality by means of appropriate reviewing procedures.