The Measurement of Residual Strains Within Thermal Barrier Coatings Using High-Energy X-Ray Diffraction

2005 ◽  
Vol 88 (10) ◽  
pp. 2817-2825 ◽  
Author(s):  
J. Thornton ◽  
S. Slater ◽  
J. Almer
Keyword(s):  
Thermal Barrier Coatings ◽  
High Energy ◽  
Thermal Barrier ◽  
X Ray Diffraction ◽  
Barrier Coatings ◽  
X Ray ◽  
Residual Strains

Synchrotron X-Ray Diffraction Study of Phase Transformation in CMAS Ingressed EB-PVD Thermal Barrier Coatings

2020 ◽  
Author(s):  
Zachary Stein ◽  
Ravisankar Naraparaju ◽  
Uwe Schulz ◽  
Peter Kenesei ◽  
Jun-Sang Park ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Diffraction Study ◽  
Thermal Barrier Coatings ◽  
Thermal Barrier ◽  
X Ray Diffraction ◽  
Barrier Coatings ◽  
X Ray

Spalling Stress in Oxidized Thermal Barrier Coatings Evaluated by X-Ray Diffraction Method

2005 ◽  
Vol 490-491 ◽  
pp. 631-636 ◽  
Author(s):  
Kenji Suzuki ◽  
Keisuke Tanaka
Keyword(s):  
Thermal Barrier Coatings ◽  
Plane Stress ◽  
Stress Measurement ◽  
Diffraction Method ◽  
High Energy ◽  
Thermally Grown Oxide ◽  
Thermal Barrier ◽  
X Rays ◽  
Barrier Coatings ◽  
X Ray

The spallation of thermal barrier coatings (TBCs) is promoted by thermally grown oxide (TGO). To improve TBCs, it is very important to understand the influence of TGO on the spalling stress. In this study ,the TBCs were oxidized at 1373 K for four diferent periods: 0, 500,1000 and 2000 h. The distribution of the in-plane stress in oxidized TBCs, s1, was obtained by repeating the X-ray stress measurement with low energy X-rays after successive removal of the surface layer. The distribution of the out-of-plane stress, s1− s3, was measured with hard synchrotron X-rays, because high energry X-rays have a large penetration depth. From the results by the low and high energy Xrays, the spalling stress in the oxidized TBCs, s3, was evaluated. The evaluated value of the spalling stress for the oxidized TBC was a small tension beneath the surface, but steeply increased near the interface between the top and bond coating. This large tensile stress near the interface is responsible for the spalling of the top coating.

Low Thermal Conductivity Ceramics for Thermal Barrier Coatings

2007 ◽  
Vol 336-338 ◽  
pp. 1764-1766 ◽  
Author(s):  
Ye Xia Qin ◽  
Jing Dong Wang ◽  
Wei Pan ◽  
Chun Lei Wan ◽  
Zhi Xue Qu
Keyword(s):  
Electron Microscopy ◽  
Thermal Conductivity ◽  
Scanning Electron Microscopy ◽  
Rare Earth ◽  
Thermal Barrier Coatings ◽  
Thermal Barrier ◽  
X Ray Diffraction ◽  
Barrier Coatings ◽  
X Ray ◽  
Scanning Electron

This paper summarizes the basic properties of a series of rare-earth zirconate ceramics (Gd2Zr2O7, Sm2Zr2O7, Dy2Zr2O7, Er2Zr2O7 and Yb2Zr2O7). The phases and microstructures were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Thermal properties of these materials were determined. The results indicated that Sm2Zr2O7 rare-earth zirconate ceramics have the lower thermal conductivity and the highest thermal expansion coefficient than other rare-earth zirconate ceramics. The dielectric constant decreases with the increase of atomic number.

scholarly journals High-energy X-ray phase analysis of CMAS-infiltrated 7YSZ thermal barrier coatings: Effect of time and temperature

2020 ◽  
Vol 35 (17) ◽  
pp. 2300-2310 ◽  
Author(s):  
Zachary Stein ◽  
Peter Kenesei ◽  
Jun-Sang Park ◽  
Jonathan Almer ◽  
Ravisankar Naraparaju ◽  
...  
Keyword(s):  
Phase Analysis ◽  
Thermal Barrier Coatings ◽  
High Energy ◽  
Thermal Barrier ◽  
Barrier Coatings ◽  
X Ray ◽  
Image Position

Abstract

scholarly journals Strain response of thermal barrier coatings captured under extreme engine environments through synchrotron X-ray diffraction

2014 ◽  
Vol 5 (1) ◽  
Author(s):  
Kevin Knipe ◽  
Albert Manero ◽  
Sanna F. Siddiqui ◽  
Carla Meid ◽  
Janine Wischek ◽  
...  
Keyword(s):  
Thermal Barrier Coatings ◽  
Thermal Barrier ◽  
Strain Response ◽  
X Ray Diffraction ◽  
Barrier Coatings ◽  
X Ray

Synchrotron X-Ray Diffraction to Quantify In-Situ Strain on Rare-Earth Doped Yttria-Stabilized Zirconia Thermal Barrier Coatings

2021 ◽  
Author(s):  
Quentin Fouliard ◽  
Johnathan Hernandez ◽  
Hossein Ebrahimi ◽  
Khanh Vo ◽  
Ranajay Ghosh ◽  
...  
Keyword(s):  
Rare Earth ◽  
Gas Turbine ◽  
Thermal Barrier Coatings ◽  
Gas Turbine Engine ◽  
Temperature Sensing ◽  
Thermal Barrier ◽  
X Ray Diffraction ◽  
Barrier Coatings ◽  
Turbine Engine ◽  
X Ray

Abstract The recent advancement in multifunctional thermal barrier coatings (TBCs) for temperature sensing or defect monitoring has gained interest over the past decade as they have shown great potential for optimized engine operation with higher efficiency, reduced fuel consumption and maintenance costs. Specifically, sensor coatings containing luminescent ions enable materials monitoring using integrated spectral characteristics. While facilitating sensing capabilities, luminescent rare-earth dopants ideally present minimal intrusiveness for the thermal barrier coating. However, the effects of rare-earth dopant addition on thermomechanical and thermochemical properties remain unclear. Our study intends to fill this knowledge gap by characterizing coatings’ internal thermomechnical properties under realistic gas turbine engine operating temperatures. In this work, TBC configurations including industry standard coatings and sensor coatings were compared to quantify dopant intrusiveness. The TBC configurations have been characterized using high-energy synchrotron X-ray diffraction while being heated up to gas turbine engine temperatures. The TBC samples have been subjected to a single cycle thermal load with multiple ramps and holds during XRD data collection. Depth-resolved XRD was used to obtain the 2D diffraction patterns corresponding to each depth location for the determination of strain distributions along the TBCs. Internal strains and stresses acting through the coatings were quantified mostly highlighting that there is negligible variation between the standard and novel sensor coatings. Thus, the thermal response at high temperature remains unaffected with addition of luminescent dopants. This evaluation of novel coating configurations provides valuable insight for future safe implementation of these temperature sensing coatings without performance reductions.

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