Al-modified YSZ thermal barrier coating prepared by PS-PVD and its application prospect
Al-modified YSZ thermal barrier coating prepared by PS-PVD and its application prospect
Xiaofeng Zhang£ª, Kesong Zhou, Min Liu, Changguang Deng, Chunming Deng, Jie Mao,
Ziqian Deng, Shaopeng Niu
(National Engineering Laboratory for Modern Materials Surface Engineering Technology & The Key Lab of Guangdong for Modern Surface Engineering Technology, Guangdong Institute of New Materials, Guangzhou 510650, China)
Plasma spray-physical vapor deposition (PS-PVD) is a novel coating process. Unlike conventional technologies, deposition can take place from solid, liquid and vapor state. This offers new opportunities to obtain advanced microstructures and thus to meet the growing demands for thermal barrier coatings (TBCs). Feather-like columnar structured 7YSZ thermal barrier coating was prepared PS-PVD. An Al film was deposited on the TBCs surface by magnetron sputtering. The Al-deposited TBCs were vacuum heat-treated. Then an ¦Á-Al2O3 layer was observed on the top of 7YSZ coating, which resulted from in situ reaction of Al and ZrO2 at high temperature under vacuum condition. The results show that the Al-deposited TBCs after vacuum heat treatment have better CMAS corrosion resistance than the as-sprayed TBCs.