plasma spray-physical vapor deposition (PS-PVD), thermal barrier coatings (TBCs), Al-modification, particle erosion resistance, thermal cycle performance
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 ZrO2, an α-Al2O3 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.
ZHANG, Xiaofeng; LI, Ming; ZHANG, Ao; GUO, Shuangquan; MAO, Jie; DENG, Chunming; WANG, Panpan; DENG, Changguang; FENG, Junli; LIU, Min; ZHOU, Kesong; and LAI, Cheng
"Al-modification for PS-PVD 7YSZ TBCs to improve particle erosion and thermal cycle performances,"
Journal of Advanced Ceramics: Vol. 11:
7, Article 5.
Available at: https://dc.tsinghuajournals.com/journal-of-advanced-ceramics/vol11/iss7/5