Effect of the interface morphology and initial nanocrack on the fracture property of a ceramic reinforced plasma-sprayed coating
Effect of the interface morphology and initial nanocrack on the fracture property of a ceramic reinforced plasma-sprayed coating
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DOI：
10.1016/j.ceramint.2020.06.279
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发表时间：
2020-11-01
影响因子：
5.2
通讯作者：
Yi, Jianhong
中科院分区：
文献类型：
--
作者：
Huang, Taihong;Deng, Chunming;Yi, Jianhong
陶瓷颗粒的引入可以大大提高等离子喷涂涂层的力学性能。在陶瓷/合金界面沉积和热应力诱导过程中获得的涂层形态会影响初始纳米裂纹的形成和失效机制，本研究对此进行了研究。使用扫描电子显微镜和扫描透射电子显微镜与能量色散X射线光谱仪来检查初始纳米裂纹的形态、陶瓷/合金界面的相组成和断裂特征。在等离子喷涂过程中，不同的陶瓷颗粒形貌导致了具有不同曲率的不同沉积结构。断裂结果表明，相邻两个陶瓷颗粒之间的界面或陶瓷颗粒较小的区域是薄弱区域。纳米裂纹在陶瓷/合金界面处形成，然后沿着陶瓷颗粒之间的界面发展。讨论了陶瓷颗粒形貌对热应力诱发、纳米裂纹形成和演化以及等离子喷涂涂层断裂特性的影响。
The introduction of ceramic particles can greatly improve the mechanical properties of plasma-sprayed coatings. The coating morphology obtained during deposition and thermal stress inducement at the ceramic/alloy interfaces affect the initial nanocrack formation and the failure mechanism, which were investigated in this study. Scanning electron microscopy and scanning transmission electron microscopy with energy dispersive X-ray spectroscopy were used to examine the morphology of the initial nanocracks, the phase composition at the ceramic/alloy interfaces and the fracture characteristics. During plasma spraying, different ceramic particle morphologies resulted in different deposition structures with various curvatures. The fracture results indicated that the interface between two adjacent ceramic particles or areas with small ceramic particles were weak areas. Nanocracks formed at the ceramic/alloy interfaces and then developed along the interface between ceramic particles. The effects of the morphology of ceramic particles on the inducement of thermal stress, the formation and evolution of nanocracks and the fracture characteristics of plasma-sprayed coatings are discussed.