Multicomponent rare earth (RE) disilicates have been recognized as promising candidates for environmental barrier coatings (EBCs). In this work, a novel EBC system with (Gd1/6Tb1/6Dy1/6Tm1/6Yb1/6Lu1/6)2Si2O7 as top coat and Si as bond coat was deposited on SiC‐based substrates by atmospheric plasma spraying technology and subjected to 200 thermal shock cycles at 1350°C. The composition and microstructure evolution in the coating during thermal cycling were investigated using x‐ray diffraction analysis and scanning electron microscopy. The results show that the as‐prepared EBC remains dense and integrated, and no obvious spalling or penetrating cracks could be observed in the coating after 200 thermal shock cycles. Furthermore, the average thickness of thermal growth oxide layer between (6RE1/6)2Si2O7 top coat and Si bond coat is 0.71 ± 0.17 µm and 0.98 ± 0.23 µm before and after the thermal cycling, respectively, indicating the excellent thermal shock resistance of (6RE1/6)2Si2O7 EBC. The present study presents a novel EBC with excellent thermal shock ability and is expected to contribute to the development of EBC for advanced SiCf/SiC ceramic matrix composites.

中文翻译：

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新型(Gd1/6Tb1/6Dy1/6Tm1/6Yb1/6Lu1/6)2Si2O7环境屏障涂层的抗热震性能

多组分稀土（RE）二硅酸盐已被认为是环境屏障涂料（EBC）的有前途的候选者。在这项工作中，一种新颖的 EBC 系统（Gd1/6铽1/6镝1/6Tm值1/6镱1/6鲁1/6）2硅2氧7通过大气等离子喷涂技术将表面涂层和粘结层沉积在碳化硅基体上，并在 1350°C 下进行 200 次热冲击循环。使用 X 射线衍射分析和扫描电子显微镜研究了热循环过程中涂层的成分和微观结构演变。结果表明，所制备的EBC仍然致密且完整，在200次热冲击循环后，涂层中没有观察到明显的剥落或穿透裂纹。此外，热生长氧化层的平均厚度（6RE1/6）2硅2氧7热循环前后面涂层和硅结合层的厚度分别为 0.71 ± 0.17 µm 和 0.98 ± 0.23 µm，表明（6RE1/6）2硅2氧7欧洲广播公司。本研究提出了一种具有优异热冲击能力的新型EBC，有望为先进SiC EBC的发展做出贡献F/SiC陶瓷基复合材料。