Comparative Performance of a Thermal Barrier Coating System Utilizing Platinum Aluminide Bond Coat on Alloys CMSX-4® and MAR M® 002DS

2011 ◽  
Vol 134 (1) ◽  
Author(s):  
H. M. Tawancy ◽  
Luai M. Al-Hadhrami
Keyword(s):  
Bond Coat ◽  
Aluminide Coating ◽  
Relative Performance ◽  
Thermal Barrier ◽  
Coating System ◽  
Diffusion Type ◽  
Comparative Performance ◽  
Platinum Aluminide ◽  
Oxidation Properties ◽  
Type Bond

It is known that the relative performance of thermal barrier coatings is largely dependent upon the oxidation properties of the bond coat utilized in the system. Also, the oxidation properties of diffusion-type bond coats (aluminides and their modifications) are functions of the superalloy substrate used in blade applications. Therefore, the performance of a given coating system utilizing a diffusion-type bond coat can significantly vary from one superalloy to another. Toward the objective of developing coating systems with more universal applicability, it is essential to understand the mechanisms by which the superalloy substrate can influence the coating performance. In this study, we examined the relative performance of yttria-stabilized zirconia/platinum aluminide coating system on alloys CMSX-4 and MAR M 002DS representing single-crystal and directionally-solidified alloy systems respectively using thermal exposure tests at 1150 °C with a 24-h cycling period to room temperature. Changes in coating microstructure were characterized by various electron-optical techniques. Experiment showed that the coating system on alloy MAR M 002DS had outperformed that on alloy CMSX-4, which could be related to the high thermal stability of the bond coat on alloy MAR M 002DS. From a detailed microstructural characterization, this difference in behavior could be explained at least partially in terms of variation in chemical composition of the two alloys, which was also reflected on the exact failure mechanism of the coating system.

Comparative Performance of a Thermal Barrier Coating System Utilizing Platinum Aluminide Bond Coat on Alloys CMSX-4® and MAR M® 002DS

2011 ◽  
Author(s):  
H. M. Tawancy ◽  
Luai M. Al-Hadhrami
Keyword(s):  
Bond Coat ◽  
Aluminide Coating ◽  
Relative Performance ◽  
Thermal Barrier ◽  
Coating System ◽  
Diffusion Type ◽  
Comparative Performance ◽  
Platinum Aluminide ◽  
Oxidation Properties ◽  
Type Bond

It is known that the relative performance of thermal barrier coatings is largely dependent upon the oxidation properties of the bond coat utilized in the system. Also, the oxidation properties of diffusion-type bond coats (aluminides and their modifications) are functions of the superalloy substrate used in blade applications. Therefore, the performance of a given coating system utilizing a diffusion-type bond coat can significantly vary from one superalloy to another. Toward the objective of developing coating systems with more universal applicability, it is essential to understand the mechanisms by which the superalloy substrate can influence the coating performance. In this study, we examined the relative performance of yttria-stabilized zirconia/platinum aluminide coating system on alloys CMSX-4 and MAR M 002DS representing single-crystal and directionally-solidified alloy systems respectively using thermal exposure tests at 1150°C with a 24-hour cycling period to room temperature. Changes in coating microstructure were characterized by various electron-optical techniques. Experiment showed that the coating system on alloy MAR M 002DS had outperformed that on alloy CMSX-4, which could be related to the high thermal stability of the bond coat on alloy MAR M 002DS. From a detailed microstructural characterization, this difference in behavior could be explained at least partially in terms of variation in chemical composition of the two alloys, which was also reflected on the exact failure mechanism of the coating system.

Preoxidation of bond coat in IN-738LC/NiCrAlY/LaMgAl11O19 thermal barrier coating system

2018 ◽  
Vol 44 (18) ◽  
pp. 22080-22091 ◽  
Author(s):  
M.M. Khorramirad ◽  
M.R. Rahimipour ◽  
S.M.M. Hadavi ◽  
K. Shirvani
Keyword(s):  
Thermal Barrier Coating ◽  
Bond Coat ◽  
Thermal Barrier ◽  
Coating System ◽  
Thermal Barrier Coating System ◽  
Barrier Coating

scholarly journals Thermal cycling behaviour of plasma sprayed NiCr-Al-Co-Y2O3 bond coat in thermal barrier coating system

2019 ◽  
Vol 23 (Suppl. 5) ◽  
pp. 1789-1800 ◽  
Author(s):  
Aleksandar Vencl ◽  
Mihailo Mrdak
Keyword(s):  
Chemical Composition ◽  
Thermal Cycling ◽  
Thermal Barrier Coating ◽  
Bond Coat ◽  
Microstructural Analysis ◽  
Thermal Barrier ◽  
Coating System ◽  
Thermal Cycles ◽  
Thermal Barrier Coating System ◽  
Barrier Coating

The aim of this study was to investigate the thermal cycling behaviour of NiCr-Al-Co- Y O bond coating in thermal barrier coating system with ZrO -MgO as a top coating. 2 3 2 The coatings were deposited by atmospheric plasma spraying on stainless steel X15Cr13 (EN 1.4024) substrate. The used composite powder NiCr-Al-Co-Y O was mechanically 2 3 cladded, and the steel substrates were preheated to 160-180 ?C. The thermal cycling performance of the obtained bond coat and the effect of formed complex ceramic oxides of the Al O -Y O system were tested by heating to 1200 ?C and cooling in air to 2 3 2 3 160-180 ?C. The number of performed thermal cycles was 7, 32, and 79. The quality of the obtained coating, as well as its thermal cycling behaviour, was assessed through the microstructural analysis, microhardness and tensile bond strength measurements, and change in chemical composition and microhardness. The obtained results showed that the steel substrate, bond coat oxidation and interdiffusion at bond coat/substrate interface have a significant influence on changes in chemical composition and microhardness of the bond coat. The correlation between oxidation behaviour of NiCr- Al-Co-Y O bond coat and number of thermal cycles was also discussed.

Characterization of the Degraded Microstructures of a Platinum Aluminide Coating

2001 ◽  
Vol 697 ◽  
Author(s):  
Hyungjun Kim ◽  
Mark E. Walter
Keyword(s):  
Bond Coat ◽  
Aluminide Coating ◽  
Thermal Exposure ◽  
Phase Evolution ◽  
Thermally Grown Oxide ◽  
Isothermal Heating ◽  
Platinum Aluminide ◽  
Barrier Coating ◽  
Micro Indentation

AbstractTo investigate phase evolution of β-(Ni,Pt)Al/γ-(Ni3Al) in thermal barrier coating bond coat systems, specimens were subjected to 1200°C cyclic and isothermal heating. By removing the thermally grown oxide (TGO) after every 10 hours of heating, aluminum (Al) depletion from the bond coat was accelerated. Non-accelerated and accelerated Al-depletion samples were examined with scanning electron microscopy after every 10 hours of cyclic and isothermal heating. Observations from after the first 10 hours of thermal exposure show distinct microstructural differences. After 50 hours of heating, cyclic accelerated Al-depletion samples show more distinct grain boundaries and a higher proportion of-(Ni3Al) phase than isothermalaccelerated Al-depletion samples. Through instrumented micro-indentation, trends in elastic modulus were determined for isothermal and cyclic accelerated Al-depletion specimens.

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