Degradation of TBC Coating during Low-Cycle Fatigue Tests at High Temperature

2013 ◽  
Vol 592-593 ◽  
pp. 461-464 ◽  
Author(s):  
Simona Hutařová ◽  
Karel Obrtlík ◽  
Martin Juliš ◽  
Ladislav Čelko ◽  
Martina Hrčková ◽  
...  
Keyword(s):  
High Temperature ◽  
Bond Coat ◽  
Low Cycle Fatigue ◽  
Fatigue Tests ◽  
Hardness Profile ◽  
Total Strain Amplitude ◽  
Coating System ◽  
Polycrystalline Nickel ◽  
Nickel Based Superalloy ◽  
Barrier Coating

The work is focused on the study of degradation of ZrO2 stabilized by Y2O3 (YSZ) thermal barrier-coating system with CoNiCrAlY bond coat applied on cast polycrystalline nickel-based superalloy Inconel 713LC. Cylindrical specimens in as-coated conditions were cyclically strained under strain control with constant total strain amplitude in symmetrical cycle at high temperature (900 °C) in air. Coating system YSZ with CoNiCrAlY bond coat were prepared by APS method on blasted surface. The microstructure of TBC was characterized with scanning electron microscopy and energy dispersion X-ray analysis. The coating thickness and hardness profile was measured. Fracture surface, surface relief and polished sections parallel to the specimen axis were examined to study damage mechanisms in coatings under cyclic loading at high temperature. It was find that initiation of the fatigue crack usually occurs on interface YSZ-CoNiCrAlY and the trajectory of the further crack propagation was documented.

Degradation of YSZ/EUCOR TBC Coating System during High Temperature Low Cycle Fatigue Tests

2016 ◽  
Vol 258 ◽  
pp. 420-423 ◽  
Author(s):  
Ivo Šulák ◽  
Karel Obrtlík ◽  
Ladislav Čelko ◽  
Pavel Gejdoš
Keyword(s):  
High Temperature ◽  
Cyclic Loading ◽  
Bond Coat ◽  
Low Cycle Fatigue ◽  
Fatigue Cracks ◽  
Fatigue Crack Initiation ◽  
Thermal Barrier ◽  
Coating System ◽  
Air Plasma ◽  
Polycrystalline Nickel

Thermal barrier coatings are widely used to protect the substrate from high temperature and extremely aggressive environments in gas engines. In the present article, authors have been studied degradation of complex thermal barrier coating system deposited on polycrystalline nickel superalloy IN 713LC. The substrate material was grit blasted with alumina (Al2O3) particles prior to air plasma deposition of CoNiCrAlY bond coat. Top coat consists of conventional zirconia (ZrO2) stabilized by yttria (Y2O3) -YSZ ceramic in combination with a eutectic nanocrystalline ceramic Eucor made of zirconia (ZrO2), alumina (Al2O3) and silicia (SiO2) –in the ratio of 50/50 in wt. %. The top coat was deposited using water stabilized plasma. Test specimens with the TBC coating system were fatigued under strain control condition in fully reversed symmetrical push-pull cycles at 900°C in air. The microstructure of TBC was characterized with scanning electron microscopy and energy dispersion X-ray analysis. The coating hardness and thickness were measured. Fracture surface and polished sections parallel to the specimen axis were examined to study damage mechanisms in coatings under cyclic loading at high temperature. TBC delamination was observed at the top coat/bond coat interface after cyclic loading at high temperature. Fatigue crack initiation sites are documented. Majority of fatigue cracks start from the surface and top coat/bond coat interface.

scholarly journals Aluminide Thermal Barrier Coating for High Temperature Performance of MAR 247 Nickel Based Superalloy

Coatings ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 48
Author(s):  
Mateusz Kopec ◽  
Dominik Kukla ◽  
Xin Yuan ◽  
Wojciech Rejmer ◽  
Zbigniew L. Kowalewski ◽  
...  
Keyword(s):  
High Temperature ◽  
Stress Amplitude ◽  
Aluminide Coating ◽  
Chemical Vapor ◽  
Fatigue Tests ◽  
Protective Atmosphere ◽  
X Ray ◽  
Nickel Based Superalloy ◽  
Barrier Coating ◽  
Aluminide Layer

In this paper, mechanical properties of the as-received and aluminide layer coated MAR 247 nickel based superalloy were examined through creep and fatigue tests. The aluminide layer of 20 µm was obtained through the chemical vapor deposition (CVD) process in the hydrogen protective atmosphere for 8 h at the temperature of 1040 °C and internal pressure of 150 mbar. A microstructure of the layer was characterized using the scanning electron microscopy (SEM) and X-ray Energy Dispersive Spectroscopy (EDS). It was found that aluminide coating improve the high temperature fatigue performance of MAR247 nickel based superalloy at 900 °C significantly. The coated MAR 247 nickel based superalloy was characterized by the stress amplitude response ranging from 350 MPa to 520 MPa, which is twice as large as that for the uncoated alloy.

Durability of Amorphous and Crystalline BMAS Thermal Barrier Coatings Produced by Plasma Spraying

2016 ◽  
Vol 258 ◽  
pp. 383-386 ◽  
Author(s):  
Ladislav Čelko ◽  
David Jech ◽  
Karel Dvořák ◽  
Ivo Šulák ◽  
Lenka Klakurková ◽  
...  
Keyword(s):  
Plasma Spraying ◽  
Amorphous Phase ◽  
Bond Coat ◽  
Atmospheric Plasma ◽  
Thermal Barrier ◽  
Polycrystalline Nickel ◽  
Cooling Period ◽  
Nickel Based Superalloy ◽  
Barrier Coating ◽  
The Difference

Barium-Magnesium-Aluminium-Silicate (BMAS) powder was produced from a mixture of initial compounds BaO–MgO–Al2O3–SiO2 by means of solid state synthesis at the temperature of 1200 °C for 3 hours in a laboratory furnace. Synthetized powder was crushed into the fraction of 15-45 μm in a planetary ball mill. Thermal barrier coating system consisting of CoNiCrAlY (bond coat) and BMAS (top coat) was sprayed by atmospheric plasma spray technique onto the polycrystalline nickel-based superalloy substrate. During plasma spraying process, the BMAS underwent phase transformation and the amorphous phase within the top coat was produced. Therefore, after the spraying, several samples were crystallized via annealing in a furnace (4 hours at 1200 °C or 24 hours at 1000 °C) or by subjecting them to several passes of plasma jet. Both samples with an amorphous phase and fully-crystallized samples were subjected to the fire in a burner-rig test (propane-oxygen flame, single 3 + 3 minute cycle), where the top coat reached the temperature of 1150 °C. Top coat failure occurred during the cooling period due to the transformation of the amorphous phase into the crystalline one and/or due to the difference in thermal conductivity and expansion between the top coat and the bond coat.

Interaction of Creep and High Cycle Fatigue of IN 713LC Superalloy

2016 ◽  
Vol 258 ◽  
pp. 595-598 ◽  
Author(s):  
Vít Horník ◽  
Miroslav Šmíd ◽  
Pavel Hutař ◽  
Ludvík Kunz ◽  
Karel Hrbáček
Keyword(s):  
High Cycle Fatigue ◽  
Fatigue Tests ◽  
Preliminary Evaluation ◽  
Cycle Fatigue ◽  
Polycrystalline Nickel ◽  
Nickel Based Superalloy ◽  
Wide Range ◽  
The Mean ◽  
Mean Stresses ◽  
Superimposed Vibrations

The study deals with the interaction of creep and high cycle fatigue of cast polycrystalline nickel-based superalloy IN 713LC at high temperatures. Previous works indicated that creep lifetime of superalloy structures was un-affected or even slightly increased in the cases with superimposed vibrations. The reason for this behaviour was not well described up to now. Therefore, set of fatigue tests was conducted at high mean stresses level to observe this phenomenon. The mean stress was kept constant while the stress amplitudes were selected in order to measure wide range of conditions from pure creep to pure fatigue. Fractographic analysis by scanning electron microscopy (SEM) was done with the aim to identify governing damage mechanisms for particular test conditions as a preliminary evaluation of conducted tests.

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

High temperature creep behavior of a cast polycrystalline nickel-based superalloy K465 under thermal cycling conditions

Materialia ◽  
2020 ◽  
Vol 14 ◽  
pp. 100913 ◽  
Author(s):  
Xiaotong Guo ◽  
Weiwei Zheng ◽  
Wenrui An ◽  
Stoichko Antonov ◽  
Longfei Li ◽  
...  
Keyword(s):  
High Temperature ◽  
Thermal Cycling ◽  
Creep Behavior ◽  
High Temperature Creep ◽  
Polycrystalline Nickel ◽  
Temperature Creep ◽  
Nickel Based Superalloy
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