Corrigendum to “The influence of laser specific energy on laser sealing of plasma sprayed yttria partially stabilized zirconia coating” [Opt Lasers Eng, 51 (2013) 159–166]

This study deals with microstructural investigations of plasma sprayed yttria partially stabilized zirconia thermal barrier coatings, performed by classical and analytical transmission electron microscopy. The aim of the study was to determine eventual relationships between coating microstructure and toughness. The ceramic/metal interface which plays an important role during TBC thermomechanical sollicitation, has also been studied. In the 6 to 8 weight % Y2O3 range, the metastable tetragonal t’ phase is observed, showing special faulted microstructural features, such as grain twinning and antiphase boundary planes. Moreover, after high temperature annealing in air, a very fine and stable precipitation of the equilibrium cubic phase appears. It is believed that these microstructural elements could act as crack deviation sites and enhance coatings intrinsic toughness. Microstructural investigations of the alumina scales grown during high temperature annealing reveal yttrium segregation at oxide grain boundaries as well as significant quantities of zirconium inside the alumina grains. The oxide growth seems to be dominated by a classical grain boundary oxygen diffusion mechanism. The presence of zirconium inside the alumina grains suggests that Al2O3 also partially forms by chemical reduction of ZrO2 by Al.

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Phases in Plasma Sprayed Thermal Barrier Coatings from Yttria Partially Stabilized Zirconia

Materialwissenschaft und Werkstofftechnik ◽

10.1002/1521-4052(200108)32:8<678::aid-mawe678>3.0.co;2-h ◽

2001 ◽

Vol 32 (8) ◽

pp. 678-680 ◽

Cited By ~ 1

Author(s):

T. Cosack ◽

B. Kopperger

Keyword(s):

Thermal Barrier Coatings ◽

Thermal Barrier ◽

Stabilized Zirconia ◽

Barrier Coatings ◽

Partially Stabilized Zirconia ◽

Yttria Partially Stabilized Zirconia ◽

Plasma Sprayed

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Microstructural Investigations of Plasma-Sprayed Yttria Partially Stabilized Zirconia TBC (In Relation to Thermomechanical Resistance and High-Temperature Oxidation Mechanisms)

Journal of Engineering for Gas Turbines and Power ◽

10.1115/1.2906802 ◽

1994 ◽

Vol 116 (1) ◽

pp. 258-265 ◽

Cited By ~ 16

Author(s):

S. Alpe´rine ◽

L. Lelait

Keyword(s):

High Temperature ◽

Chemical Reduction ◽

Diffusion Mechanism ◽

Cubic Phase ◽

High Temperature Annealing ◽

Stabilized Zirconia ◽

Temperature Oxidation ◽

Partially Stabilized Zirconia ◽

Yttria Partially Stabilized Zirconia ◽

Plasma Sprayed

This study deals with microstructural investigations of plasma-sprayed yttria partially stabilized zirconia thermal barrier coatings, performed by classical and analytical transmission electron microscopy. The aim of the study was to determine eventual relationships between coating microstructure and toughness. The ceramic/metal interface, which plays an important role during TBC thermomechanical solicitation, has also been studied. In the 6–8 wt. percent Y2O3 range, the metastable tetragonal t′ phase is observed, showing special faulted microstructural features, such as grain twinning and antiphase boundary planes. Moreover, after high-temperature annealing in air, a very fine and stable precipitation of the equilibrium cubic phase appears. It is believed that these microstructural elements could act as crack deviation sites and enhance the coatings’ intrinsic toughness. Microstructural investigations of the alumina scales grown during high-temperature annealing reveal yttrium segregation at oxide grain boundaries as well as significant quantities of zirconium inside the alumina grains. The oxide growth seems to be dominated by a classical grain boundary oxygen diffusion mechanism. The presence of zirconium inside the alumina grains suggests that Al2O3 also partially forms by chemical reduction of ZrO2 by Al.

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