Zhong X.H.,CAS Changchun Institute of Applied Chemistry |
Zhong X.H.,University of Chinese Academy of Sciences |
Wang Y.M.,Jilin Province Laser Institute |
Xu Z.H.,CAS Changchun Institute of Applied Chemistry |
And 6 more authors.
Journal of the European Ceramic Society | Year: 2010
A dense clad overlay with chemical inertness was achieved on top of the plasma-sprayed YSZ thermal barrier coatings by laser in order to protect them from hot-corrosion attack. The Al2O3-clad YSZ coating exhibited good hot-corrosion behavior in contact with salt mixture of vanadium pentoxide (V2O5) and sodium sulfate (Na2SO4) for a longtime of 100 h at 1173 K. The LaPO4-clad YSZ coating showed corrosion resistance inferior to the Al2O3-clad one. Yttria was leached from YSZ by reaction between Y2O3 and V2O5, which caused progressive destabilization transformation of YSZ from tetragonal (t) to monoclinic (m) phase. The chemical inertness of the clad layers and the restrained infiltration of the molten corrosive salts by the dense clad layers were primary contributions to improvement of the hot-corrosion resistances. © 2009 Elsevier Ltd. All rights reserved.