The influence of laser treatment on hot corrosion behavior of plasma-sprayed nanostructured yttria stabilized zirconia thermal barrier coatings

2014 ◽  
Vol 34 (8) ◽  
pp. 2013-2021 ◽  
Author(s):  
Reza Ghasemi ◽  
Reza Shoja-Razavi ◽  
Reza Mozafarinia ◽  
Hossein Jamali ◽  
Morteza Hajizadeh-Oghaz ◽  
...  
Keyword(s):  
Laser Treatment ◽  
Thermal Barrier Coatings ◽  
Corrosion Behavior ◽  
Hot Corrosion ◽  
Yttria Stabilized Zirconia ◽  
Thermal Barrier ◽  
Stabilized Zirconia ◽  
Barrier Coatings ◽  
Plasma Sprayed

Hot corrosion behavior of multi-layer suspension plasma sprayed Gd2Zr2O7/YSZ thermal barrier coatings

2017 ◽  
Vol 66 (5) ◽  
pp. 180-184 ◽  
Author(s):  
K. P. Jonnalagadda ◽  
R. L. Peng ◽  
S. Mahade ◽  
N. Markocsan ◽  
P. Nylén ◽  
...  
Keyword(s):  
Thermal Barrier Coatings ◽  
Corrosion Behavior ◽  
Hot Corrosion ◽  
Thermal Barrier ◽  
Barrier Coatings ◽  
Plasma Sprayed

Improving Thermal Shock Resistance of Plasma-Sprayed Yttria-Stabilized Zirconia Thermal Barrier Coatings by Laser Remelting

2012 ◽  
Vol 472-475 ◽  
pp. 2502-2507
Author(s):  
Zong Yin Duan ◽  
Dong Sheng Wang
Keyword(s):  
Thermal Shock ◽  
Thermal Barrier Coatings ◽  
Thermal Shock Resistance ◽  
Yttria Stabilized Zirconia ◽  
Thermal Barrier ◽  
Laser Remelting ◽  
Stabilized Zirconia ◽  
Barrier Coatings ◽  
Shock Resistance ◽  
Plasma Sprayed

This paper deals with the microstructure and thermal shock behavior of laser remelting of yttria-stabilized zirconia (YSZ) thermal barrier coatings (TBCs) deposited by plasma spraying. The microstructures of the coatings were analyzed by scanning electron microscopy (SEM). It was found that the as-sprayed ceramic coating had laminated structure with high porosity. However, the coating exhibited a dense lamellar-like layer with segment cracks on the remained plasma-sprayed porous layer. Thermal shock experiments for the two kinds of TBCs were performed by water quenching method. Testing result showed that the laser-remelted TBC had better thermal shock resistance than the as-sprayed one. The damage mode of the as-sprayed TBC was great-size whole spalling. In contract, the failure mechanism of the laser-remelted one was mainly local pelling. Segmented cracks of the top ceramic coatings caused by laser remelting improved the stress accommodation and were mainly attributed to the enhancement for thermal shock life of TBC.

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