Investigation of Crack Propagation Behavior of Atmospheric Plasma-Sprayed Thermal Barrier Coatings under Uniaxial Tension Using the Acoustic Emission Technique

2015 ◽  
Vol 24 (3) ◽  
pp. 296-308 ◽  
Author(s):  
L. Wang ◽  
C. G. Liu ◽  
X. H. Zhong ◽  
Y. X. Zhao ◽  
H. Y. Zhao ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Crack Propagation ◽  
Thermal Barrier Coatings ◽  
Atmospheric Plasma ◽  
Thermal Barrier ◽  
Acoustic Emission Technique ◽  
Barrier Coatings ◽  
Propagation Behavior ◽  
Plasma Sprayed ◽  
Crack Propagation Behavior

scholarly journals A Simulation Study on the Crack Propagation Behavior of Nanostructured Thermal Barrier Coatings with Tailored Microstructure

Coatings ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 722
Author(s):  
Lei Zhang ◽  
Yu Wang ◽  
Wei Fan ◽  
Yuan Gao ◽  
Yiwen Sun ◽  
...  
Keyword(s):  
Tensile Stress ◽  
Crack Propagation ◽  
Thermal Barrier Coatings ◽  
Element Model ◽  
Nano Particles ◽  
Thermal Barrier ◽  
Barrier Coatings ◽  
Propagation Behavior ◽  
Stress Zone ◽  
Crack Propagation Behavior

The initiation and propagation of cracks are crucial to the reliability and stability of thermal barrier coatings (TBCs). It is important and necessary to develop an effective method for the prediction of the crack propagation behavior of TBCs. In this study, an extended finite element model (XFEM) based on the real microstructure of nanostructured TBCs was built and employed to elucidate the correlation between the microstructure and crack propagation behavior. Results showed that the unmelted nano-particles (UNPs) that were distributed in the nanostructured coating had an obvious “capture effect” on the cracks, which means that many cracks easily accumulated in the tensile stress zone of the adjacent UNPs and a complex microcrack network formed at their periphery. Arbitrarily oriented cracks mainly propagated parallel to the x-axis at the final stage of thermal cycles and the tensile stress was the main driving force for the spallation failure of TBCs. Correspondingly, I and I–II mixed types of cracks are the major cracking patterns.

Vacuum Plasma Sprayed ZrO2-Based Thermal Barrier Coatings for Aerospace Applications

1998 ◽  
Author(s):  
T. Brzezinski ◽  
A. Cavasin ◽  
S. Grenier ◽  
E. Kharlanova ◽  
G. Kim ◽  
...  
Keyword(s):  
Thermal Shock ◽  
Thermal Barrier Coatings ◽  
Temperature Drop ◽  
Single Step ◽  
Atmospheric Plasma ◽  
Thermal Barrier ◽  
Vacuum Plasma Spray ◽  
Barrier Coatings ◽  
Vacuum Plasma ◽  
Plasma Sprayed

Abstract Zirconia-based thermal barrier coatings (TBCs), produced using Vacuum Plasma Spray (VPS) technology, were recently subjected to burner rig testing. The VPS TBC performance was compared to TBCs deposited using conventional Atmospheric Plasma Sprayed (APS) and Electron Beam Physical Vapor Deposition (EB-PVD) techniques. All of the coatings consisted of an MCrAlY bond coat and a partially stabilized ZrO2-8%Y2O3 (PSZ) top coat. The TBC coated pins (6.35 mm in diameter) were tested using gas temperatures ranging from 110CC to 1500°C. The pins were tested to failure under severe conditions (1500°C gas temperature, with no internal cooling). The initial testing indicated that under typical operating gas temperatures (1400°C), the VPS TBC performance was comparable, if not superior, to conventional TBCs. Following the encouraging results, thick composite TBCs, produced in a single-step operation, were investigated. Preliminary work on ZrO2-8% Y2O3/Ca2SiO4 composite TBCs with interlayer grading included thermal shock testing and temperature drop measurements across the TBC. The composite TBC thicknesses ranged from 850µm to 1.8 mm. Initial results indicate that thick adherent composite TBCs, with high resistance to severe thermal shock, can be produced in a single step using the VPS process.

Remote temperature sensing on and beneath atmospheric plasma sprayed thermal barrier coatings using thermographic phosphors

2016 ◽  
Vol 302 ◽  
pp. 359-367 ◽  
Author(s):  
Fahed Abou Nada ◽  
Andreas Lantz ◽  
Jenny Larfeldt ◽  
Nicolaie Markocsan ◽  
Marcus Aldén ◽  
...  
Keyword(s):  
Thermal Barrier Coatings ◽  
Temperature Sensing ◽  
Atmospheric Plasma ◽  
Thermal Barrier ◽  
Barrier Coatings ◽  
Thermographic Phosphors ◽  
Plasma Sprayed
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