Dependence of splat remelt and stress evolution on surface roughness length scales in plasma sprayed thermal barrier coatings

2009 ◽  
Vol 27 (2) ◽  
pp. 479-484 ◽  
Author(s):  
S.N. Basu ◽  
G. Ye ◽  
R. Khare ◽  
B. McCandless ◽  
M. Gevelber ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Thermal Barrier Coatings ◽  
Roughness Length ◽  
Thermal Barrier ◽  
Stress Evolution ◽  
Length Scales ◽  
Barrier Coatings ◽  
Surface Roughness Length ◽  
Plasma Sprayed

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.

scholarly journals An image-based model for the sintering of air plasma sprayed thermal barrier coatings

2021 ◽  
Vol 206 ◽  
pp. 116649
Author(s):  
Xun Zhang ◽  
Alan C.F. Cocks ◽  
Yoshifumi Okajima ◽  
Kazuma Takeno ◽  
Taiji Torigoe
Keyword(s):  
Thermal Barrier Coatings ◽  
Thermal Barrier ◽  
Air Plasma ◽  
Barrier Coatings ◽  
Plasma Sprayed
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