Thermal wave testing of plasma-sprayed coatings and a comparison of the effects of coating microstructure on the propagation of thermal and ultrasonic waves

1985 ◽  
Vol 20 (3) ◽  
pp. 955-966 ◽  
Author(s):  
P. M. Patel ◽  
D. P. Almond
Keyword(s):  
Thermal Wave ◽  
Ultrasonic Waves ◽  
Coating Microstructure ◽  
Plasma Sprayed Coatings ◽  
Plasma Sprayed ◽  
Sprayed Coatings

Characterization of plasma sprayed coatings using thermal wave infrared video imaging

1987 ◽  
Vol 6 (4) ◽  
pp. 169-175 ◽  
Author(s):  
T. Ahmed ◽  
Z. J. Feng ◽  
P. K. Kuo ◽  
J. Hartikainen ◽  
J. Jaarinen
Keyword(s):  
Thermal Wave ◽  
Video Imaging ◽  
Infrared Video ◽  
Plasma Sprayed Coatings ◽  
Plasma Sprayed ◽  
Sprayed Coatings

Wear Mechanisms of Mcraiy Abradable Plasma-Sprayed Coatings

1998 ◽  
Author(s):  
S. Li ◽  
C. Langlade-Bomba ◽  
D. Treheux ◽  
F. Crabos ◽  
P. Monge-Cadet
Keyword(s):  
Wear Mechanisms ◽  
Gas Turbines ◽  
Coating Microstructure ◽  
Blade Tip ◽  
Plasma Sprayed Coatings ◽  
Plasma Sprayed ◽  
Abradable Coatings ◽  
Engine Components ◽  
New Generation ◽  
Sprayed Coatings

Abstract Reduction of operating clearance between the HP turbine and the shroud in the new generation of gas turbines is one way often used by engine manufacturers to improve efficiency. This implies developing a blade tip coating/shroud coating system to minimize the degradation (particularly blades wear) during eventual rubbing. In this study, the chosen systems are: - VPS NiCoCrAIYTa as HP blade tip coating, - Plasma-sprayed MCrAIY coatings deposited under various atmosphere as abradable coatings. In order to understand the wear mechanisms of these systems tribological tests (block on ring and fretting) were performed to study the influence of the coating microstructure on the wear mechanisms. The results were compared and correlated to those of rub tests performed with real engine components.

Thermal Wave Imaging and Ultrasonic Characterization of Defects in Plasma Sprayed Coatings

1995 ◽  
Vol 10 (5) ◽  
pp. 1077-1086 ◽  
Author(s):  
S. Parthasarathi ◽  
M. D. Aesoph ◽  
K. Sampath ◽  
B. R. Tittmann
Keyword(s):  
Thermal Wave ◽  
Ultrasonic Characterization ◽  
Wave Imaging ◽  
Plasma Sprayed Coatings ◽  
Plasma Sprayed ◽  
Sprayed Coatings ◽  
Thermal Wave Imaging

An evaluation of the suitability of thermal wave interferometry for the testing of plasma sprayed coatings

1985 ◽  
Vol 18 (1) ◽  
pp. 17-24 ◽  
Author(s):  
D.P. Almond ◽  
P.M. Patel ◽  
I.M. Pickup ◽  
H. Reiter
Keyword(s):  
Thermal Wave ◽  
Plasma Sprayed Coatings ◽  
Plasma Sprayed ◽  
Sprayed Coatings

Influence of the Torch to Substrate Velocity and Resulting Temperature on the Residual Stresses in Alumina Plasma Sprayed Coatings

1997 ◽  
Author(s):  
A.C. Leger ◽  
A. Grimaud ◽  
P. Fauchais ◽  
G. Delluc
Keyword(s):  
Residual Stresses ◽  
Displacement Sensor ◽  
Columnar Growth ◽  
Coating Microstructure ◽  
Plasma Sprayed Coatings ◽  
Stress Formation ◽  
Flat Beam ◽  
Plasma Sprayed ◽  
Sprayed Coatings

Abstract A system, developed in the laboratory, allows to record in situ the deformation of a flat beam with a displacement sensor and so to analyse stress formation during spraying and upon cooling with fixed or rotating substrates. The beam is fixed onto a pair of knife edges by springs. The knife edges are disposed on a water-cooled rotating cylindrical substrate holder and the beam substrate (2 x 15 x 100 mm3) is parallel to the holder axis. The torch is moved back and forth parallel to the holder axis and the beam temperature is recorded by a thermocouple spot welded to it and also by an IR pyrometer. The influence of beam temperature for a given torch/substrate velocity on the residual stresses is studied for alumina and zirconia coatings. With fixed substrates a sharp increase of the residual stresses related to coating microstructure exists for a transition temperature around 600°C. It seems to correspond to a columnar growth throughout the layered splats. The effect of the torch to substrate velocity and so the pass thickness is studied too.

CHARACTERIZATION OF AS-SPRAYED AND LASER-TREATED ZIRCONIA-BASED PLASMA SPRAYED COATINGS

1990 ◽  
Vol 51 (C5) ◽  
pp. C5-393-C5-402
Author(s):  
A. FERRIERE ◽  
G. FLAMANT ◽  
J.-F. ROBERT ◽  
P. PEKSHEV ◽  
I. SMUROV ◽  
...  
Keyword(s):  
Plasma Sprayed Coatings ◽  
Plasma Sprayed ◽  
Sprayed Coatings
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