Microstructural characterization of plasma sprayed Ln 2 Zr 2 O 7 thermal barrier coatings by electron microscopy methods

2020 ◽  
Vol 83 (5) ◽  
pp. 523-530
Author(s):  
Grzegorz Moskal
Keyword(s):  
Electron Microscopy ◽  
Thermal Barrier Coatings ◽  
Microstructural Characterization ◽  
Thermal Barrier ◽  
Barrier Coatings ◽  
Plasma Sprayed

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

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 Oxidation Behavior of the Monolayered La2Zr2O7, Composite La2Zr2O7 + 8YSZ, and Double-Ceramic Layered La2Zr2O7/La2Zr2O7 + 8YSZ/8YSZ Thermal Barrier Coatings

Materials ◽  
2020 ◽  
Vol 13 (14) ◽  
pp. 3242 ◽  
Author(s):  
Anna Jasik ◽  
Grzegorz Moskal ◽  
Marta Mikuśkiewicz ◽  
Agnieszka Tomaszewska ◽  
Sebastian Jucha ◽  
...  
Keyword(s):  
Thermal Barrier Coatings ◽  
Bond Coat ◽  
Microstructural Characterization ◽  
Thermally Grown Oxide ◽  
Atmospheric Plasma ◽  
Ceramic Layer ◽  
Thermal Barrier ◽  
Equal Weight ◽  
Barrier Coatings

The degradation process of thermal barrier coatings (TBCs) such as monolayered La2Zr2O7, composite 50% La2Zr2O7 + 50% 8YSZ, and double-ceramic layer (DCL) La2Zr2O7/50% La2Zr2O7 + 50% 8YSZ/8YSZ was investigated. Coatings were deposited using the atmospheric plasma spraying (APS) process (ceramic layer and bond-coat) on the Ni-based superalloy substrate with Ni-22Cr-10Al-1Y bond-coat. The thickness of the ceramic top-coats in all cases were 300 µm. In the case of La2Zr2O7/8YSZ, the internal sublayer was built from 8YSZ powder whereas the outer from La2Zr2O7. Between both sublayers’ “composite” a 50% La2Zr2O7 + 50% 8YSZ zone was present. The “composite” 50% La2Zr2O7 + 50% 8YSZ TBC system was sprayed from two different feedstock powders with equal weight ratios. In the first part of the investigation, the microstructural characterization of the TBCs was presented. The main goals were related to the characterization of the degradation processes in different TBC systems with special emphasis on the phenomenon in the thermally grown oxide (TGO) zone related to oxidation, and the phenomenon related to phase stability in ceramic top-coats as related to temperature influence. The oxidation test was carried out in air at 1100 °C for 500 h. In the second step of the investigation, the numerical simulation of the monolayered TBC 8YSZ and La2Zr2O7 systems was analyzed from the stress distribution point of view. Additionally, the two-layered TBC coating of the DCL type was also analyzed.

scholarly journals Microstructural Characterization of Thermal Barrier Coatings Glazed by a High Power Laser

2016 ◽  
Vol 723 ◽  
pp. 247-251 ◽  
Author(s):  
Hong Zhou ◽  
Fei Li ◽  
Jun Wang ◽  
Bao De Sun
Keyword(s):  
Surface Roughness ◽  
Thermal Barrier Coatings ◽  
High Power ◽  
Microstructural Characterization ◽  
Ceramic Coatings ◽  
Thermal Barrier ◽  
High Power Laser ◽  
Power Laser ◽  
Barrier Coatings ◽  
Plasma Sprayed

Thermal barrier coatings have been widely used in in both energy and propulsion systems. Plasma-sprayed thermal barrier coatings have relatively high interconnected porosity and lamina structure, which bring out a low bond strength, and lead to a short thermal cycling life. Lasers can be used for modification of materials surface. In this paper, plasma-sprayed thermal barrier coatings were laser-glazed by a high power laser in order to modify the structures. The microstructure of laser-glazed TBCs is investigated. The change on surface roughness has been examined. The result indicates that a smooth and dense glazed surface with craters and a network of microcracks is obtained after laser-glazing. The laser-glazed region consists of a columnar microstructure. There are segmentation microcracks in the laser-glazed coatings, which don’t run through the coatings along thickness. Surface roughness has been reduced significantly for the laser treated ceramic coatings.

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