Shear Strength of a Thermal Barrier Coating Parallel to the Bond Coat

1998 ◽  
Vol 120 (1) ◽  
pp. 26-32 ◽  
Author(s):  
T. A. Cruse ◽  
R. C. Dommarco ◽  
P. C. Basti´as
Keyword(s):  
Shear Strength ◽  
Thermal Barrier Coating ◽  
Bond Coat ◽  
Low Cycle Fatigue ◽  
High Stress ◽  
Test Method ◽  
Thermal Barrier ◽  
Cycle Fatigue ◽  
Air Plasma ◽  
Barrier Coating

The static and low cycle fatigue strength of an air plasma sprayed (APS) partially stabilized zirconia thermal barrier coating (TBC) is experimentally evaluated. The shear testing utilized the Iosipescu shear test arrangement. Testing was performed parallel to the TBC-substrate interface. The TBC testing required an innovative use of steel extensions with the TBC bonded between the steel extensions to form the standard losipescu specimen shape. The test method appears to have been successful. Fracture of the TBC was initiated in shear, although unconstrained specimen fractures propagated at the TBC-bond coat interface. The use of side grooves on the TBC was successful in keeping the failure in the gage section and did not appear to affect the shear strength values that were measured. Low cycle fatigue failures were obtained at high stress levels approaching the ultimate strength of the TBC. The static and fatigue strengths do not appear to be markedly different from tensile properties for comparable TBC material.

scholarly journals Investigation on the performance of air plasma sprayed thermal barrier coating with Lu/Hf-doped NiAl bond coat

2019 ◽  
Vol 360 ◽  
pp. 140-152 ◽  
Author(s):  
Chunshan Zhao ◽  
Lirong Luo ◽  
Jie Lu ◽  
Xiaofeng Zhao ◽  
Xin Wang ◽  
...  
Keyword(s):  
Thermal Barrier Coating ◽  
Bond Coat ◽  
Thermal Barrier ◽  
Air Plasma ◽  
Barrier Coating ◽  
Plasma Sprayed

Depletion Model of Aluminum in Bond Coat for Plasma-Sprayed Thermal Barrier Coatings

2009 ◽  
Vol 75 ◽  
pp. 31-35 ◽  
Author(s):  
Chang Che ◽  
G.Q. Wu ◽  
Hong Yu Qi ◽  
Z. Huang ◽  
Xiao Guang Yang
Keyword(s):  
Mathematical Model ◽  
Thermal Barrier Coating ◽  
Thermal Barrier Coatings ◽  
Bond Coat ◽  
Thermal Exposure ◽  
Thermal Barrier ◽  
Air Plasma ◽  
Barrier Coatings ◽  
Barrier Coating ◽  
Plasma Sprayed

The aluminum depletion of NiCrAlY bond coat in an air-plasma-sprayed thermal barrier coating (TBC) has been studied by experimental and simulative approaches. Upon thermal exposure, Al depletion regions were observed. The depletion of aluminum is resulting from Al diffusion towards the surface of bond coat and into substrate. A mathematical model of Al depletion was presented. The model is able to explain the observed results in a qualitative way and has been shown that Al depletes within the bond coat by diffusion.

scholarly journals Thermal Fatigue Behavior of Air-Plasma Sprayed Thermal Barrier Coating with Bond Coat Species in Cyclic Thermal Exposure

Materials ◽  
2013 ◽  
Vol 6 (8) ◽  
pp. 3387-3403 ◽  
Author(s):  
Zhe Lu ◽  
Sang-Won Myoung ◽  
Yeon-Gil Jung ◽  
Govindasamy Balakrishnan ◽  
Jeongseung Lee ◽  
...  
Keyword(s):  
Thermal Barrier Coating ◽  
Thermal Fatigue ◽  
Bond Coat ◽  
Fatigue Behavior ◽  
Thermal Exposure ◽  
Thermal Barrier ◽  
Air Plasma ◽  
Barrier Coating ◽  
Thermal Fatigue Behavior ◽  
Plasma Sprayed

Low cycle fatigue performance of Ni-based superalloy coated with complex thermal barrier coating

2018 ◽  
Vol 139 ◽  
pp. 347-354 ◽  
Author(s):  
Ivo Šulák ◽  
Karel Obrtlík ◽  
Ladislav Čelko ◽  
Tomáš Chráska ◽  
David Jech ◽  
...  
Keyword(s):  
Thermal Barrier Coating ◽  
Low Cycle Fatigue ◽  
Fatigue Performance ◽  
Thermal Barrier ◽  
Cycle Fatigue ◽  
Barrier Coating

Effect of Thermal Barrier Coating on Low Cycle Fatigue Behavior of Cast Inconel 713LC at 900 °C

2014 ◽  
Vol 891-892 ◽  
pp. 848-853 ◽  
Author(s):  
Karel Obrtlík ◽  
Simona Hutařová ◽  
Ladislav Čelko ◽  
Martin Juliš ◽  
Tomáš Podrábský ◽  
...  
Keyword(s):  
Surface Treatment ◽  
Thermal Barrier Coating ◽  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
Strain Curve ◽  
Thermal Barrier ◽  
Total Strain Amplitude ◽  
Cycle Fatigue ◽  
Barrier Coating ◽  
Gauge Section

The effect of thermal barrier coating (TBC) on low cycle fatigue behavior of cast superalloy Inconel 713 LC has been studied at 900 °C. The TBC consisting of a CoNiCrAlY bond coat and a zirconia (ZrO2) top coat stabilized by 8% yttria (Y2O3) was deposited on the gauge section of cylindrical specimens using the atmospheric plasma spray technique. Cylindrical specimens of Inconel 713LC in as-received condition and with surface treatment were cyclically strained under strain control with constant total strain amplitude in symmetrical cycle at 900 °C in air. Hardening/softening curves, cyclic stress-strain curve and fatigue life data of coated and uncoated material were obtained. The stress response of the TBC coated specimens is lower in comparison with the uncoated specimens. Detrimental effect of surface treatment on the Basquin curve is documented. Specimen sectioning and fracture surface observations revealed fatigue damage mechanisms and help to discuss differences in fatigue behavior of the coated and uncoated superalloy.

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