Article ID Journal Published Year Pages File Type
1657001 Surface and Coatings Technology 2015 7 Pages PDF
Abstract

•YSZ coatings with three different microstructures were deposited by PS-PVD.•The effect of microstructure on thermal conductivity of PS-PVD YSZ coatings was studied.•The YSZ TBCs with optimized microstructure showed a good performance in thermal cycling tests.

Plasma spray physical vapor deposition (PS-PVD) was used to deposit yttria stabilized zirconia (YSZ) coatings with microstructures varying from dense lamellae to quasi-columns out of vapor, as well as hybrid microstructure resulting from liquid droplet and vapor co-deposition. Among the coatings investigated, the quasi-columnar coating exhibited the lowest thermal conductivity of around 1.1 W/mK at 1200 °C due to high porosity and defects. The quasi-columnar coating also had an average life of around 2000 cycles during flame shock testing with a coating surface temperature of ~ 1200 °C. The failure of the coating occurred through cracking at the interface between the thermally grown oxide (TGO) layer and YSZ top coat.

Related Topics
Physical Sciences and Engineering Materials Science Nanotechnology
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