Microstructure Evolution of Nd2O3 and Yb2O3 Co-Doped YSZ Thermal Barrier Coatings during High Temperature Exposure

Qiu Li Wei; Hong Bo Guo; Sheng Kai Gong

doi:10.4028/www.scientific.net/MSF.546-549.1735

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HomeMaterials Science ForumMaterials Science Forum Vols. 546-549Microstructure Evolution of Nd2O3 and Yb2O3...

Microstructure Evolution of Nd₂O₃ and Yb₂O₃ Co-Doped YSZ Thermal Barrier Coatings during High Temperature Exposure

Abstract:

10mol% Nd2O3 and Yb2O3 co-doped YSZ thermal barrier coatings were produced by electron beam physical vapor deposition (EB-PVD). Compared to the traditional YSZ coating, the deposited coating has shown tree-like microstructure in each column. Due to this, the co-doped coating is more porous than the YSZ coating. The microstructure evolution of the coating during high temperature exposure at 1373 K was studied. The tree-like microstructure disappeared due to joining of sub-grains during sintering. Thermal growth oxide (TGO) grew quickly at the first few hours and then the growth of TGO became slow in the subsequent high temperature exposure. Cracks generated and propagated in the ceramic top coat and along the interface of the top coat and TGO layer. Finally, the coalescence of such cracks resulted in failure of the TBCs.

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Periodical:

Materials Science Forum (Volumes 546-549)

Pages:

1735-1738

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.546-549.1735

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Online since:

May 2007

Authors:

Qiu Li Wei, Hong Bo Guo, Sheng Kai Gong

Keywords:

Electron Beam Physical Vapor Deposition (EB PVD), Failure, Heat Treatment, Sintering, Thermal Barrier Coating (TBC)

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