Characterization of microstructural defects in plasma-sprayed thermal barrier coatings

1995 ◽  
Vol 4 (3) ◽  
pp. 245-251 ◽  
Author(s):  
P. Bengtsson ◽  
T. Johannesson
Keyword(s):  
Thermal Barrier Coatings ◽  
Thermal Barrier ◽  
Barrier Coatings ◽  
Microstructural Defects ◽  
Plasma Sprayed

Characterization of Plasma Sprayed and Electron Beam-Physical Vapor Deposited Thermal Barrier Coatings

1997 ◽  
Author(s):  
Z. Mutasim ◽  
C. Rimlinger ◽  
W. Brentnall
Keyword(s):  
Electron Beam ◽  
Thermal Barrier Coatings ◽  
Thermal Barrier ◽  
Air Plasma ◽  
Barrier Coatings ◽  
And Performance ◽  
Plasma Sprayed ◽  
Industrial Gas Turbine ◽  
Tbc Systems

Laboratory testing was conducted on air plasma sprayed (APS) and electron beam-physical vapor deposited (EB-PVD) thermal barrier coatings (TBCs) applied onto nickel alloy specimens. As-coated chemistry, microstructure, and bond strength of the TBC systems were evaluated. Cyclic oxidation tests that simulated industrial gas turbine environments were also conducted on the various thermal barrier coatings. This study evaluated the effects of ceramic and metallic coating compositions and application processes on coatings microstructure and performance. The relative cyclic performance of the TBC systems was determined from the laboratory tests.

scholarly journals Morphological and microstructural characterization of laser-glazed plasma-sprayed thermal barrier coatings

2006 ◽  
Vol 200 (9) ◽  
pp. 2929-2937 ◽  
Author(s):  
C. Batista ◽  
A. Portinha ◽  
R.M. Ribeiro ◽  
V. Teixeira ◽  
M.F. Costa ◽  
...  
Keyword(s):  
Thermal Barrier Coatings ◽  
Microstructural Characterization ◽  
Thermal Barrier ◽  
Barrier Coatings ◽  
Plasma Sprayed

Modeling and Characterization of Residual Stresses and Microstructure in Thermal Barrier Coatings after Plasma Spraying

1996 ◽  
Author(s):  
C. Persson ◽  
P. Bengtsson ◽  
J. Wigren ◽  
D. Greving
Keyword(s):  
Residual Stresses ◽  
Thermal Barrier Coatings ◽  
Thermal Stresses ◽  
Element Model ◽  
Thermal Barrier ◽  
Barrier Coatings ◽  
Bond Coating ◽  
Plasma Sprayed ◽  
Removal Technique

Abstract Thermal barrier coatings with a zirconia top coating and a NiCoCrAlY bond coating were plasma sprayed onto a nickelbase alloy. The pre-heating of the bond coated substrates and the cooling during the top coating spraying were varied to produce five different spray sets. A finite element model was developed to predict the heat transfer and the resulting thermal stresses during the spraying. A layer removal technique was used to measure the residual stresses in the as-sprayed samples. The measurements revealed low residual stresses in the top coatings and tensile stresses in the order of 150 MPa in the bond coating. A correlation between the measured top coating residual stresses and the substrate temperature in the end of the top coating spraying was found. In general, good agreement between modelled and measured residual stresses was found. The top coatings were found to contain vertical microcracks and the densities of the cracks were point-counted in the spray sets. A slight increase in microcrack densities was found as the spraying was performed onto a colder substrate. The densities of vertical microcracks were correlated to modelled in-elastic strain in the top coatings.

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