Al-modification for PS-PVD 7YSZ TBCs to improve particle erosion and thermal cycle performances
Xiaofeng Zhang, Ming Li, Ao Zhang, Shuangquan Guo, Jie Mao, Chunming Deng, Panpan Wang, Changguang Deng, Junli Feng, Min Liu, Kesong Zhou, Cheng Lai
Abstract
Abstract Plasma spray-physical vapor deposition (PS-PVD) as a novel process was used to prepare feather-like columnar thermal barrier coatings (TBCs). This special microstructure shows good strain tolerance and non-line-of-sight (NLOS) deposition, giving great potential application in aero-engine. However, due to serious service environment of aero-engine, particle erosion performance is a weakness for PS-PVD 7YSZ TBCs. As a solution, an Al-modification approach was proposed in this investigation. Through in-situ reaction of Al and ZrO 2 , an α-Al 2 O 3 overlay can be formed on the surface of 7YSZ columnar coating. The results demonstrate that this approach can improve particle erosion resistance since hardness improvement of Al-modified TBCs. Meanwhile, as another important performance of thermal cycle, it has a better optimization with 350-cycle water-quenching, compared with the as-sprayed TBCs.