Investigation on Failure in Thermal Barrier Coatings on Gas Turbine First-Stage Rotor Blade

Ali, Rashid; Shehbaz, Tauheed; Bemporad, Edoardo

doi:10.1007/s11668-018-0530-5

Cited by 5 publications

(2 citation statements)

References 14 publications

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“…Therefore, substantial substrate temperature increases resulting from potential TBC loss can cause failure of the component within relatively few operational cycles. TBC damage mechanisms are complex and ultimate failure can result in the spallation of the top coat (Ali et al, 2018;Evans et al, 2001;Schlichting et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Assessment of Substrate and TBC Damage Effects on Resonance Frequencies for Blade Health Monitoring

Dyke

Nganbe

2022

International Journal of Manufacturing, Materials, and Mechanical Engineering

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The reliability of critical aircraft components continues to shift towards onboard monitoring to optimize maintenance scheduling, economy efficiency and safety. Therefore, the present study investigates changes in dynamic behavior of turbine blades for the detection of defects, with focus on substrate cracks and TBC spallation as they relate to vibration modes 1 to 6. Two‐dimensional and three-dimensional finite element simulation is used. The results indicate that TBC spallation reduces natural frequencies due to the ensuing hot spot and overall increase in temperature, leading to drops in blade stiffness and strength. Cracks cause even larger frequency shifts due to local plastic deformation at the crack that changes the energy dissipation behavior. Mode 1 vibration shows the largest shifts in natural frequencies that best correlate to the size of defects and their position. As such, it may be most appropriate for the early assessment of the severity and location of defects.

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Section: Introductionmentioning

confidence: 99%

Assessment of Substrate and TBC Damage Effects on Resonance Frequencies for Blade Health Monitoring

Dyke

Nganbe

2022

International Journal of Manufacturing, Materials, and Mechanical Engineering

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“…These coatings consists of an oxidation resistant bond coat and a thermally insulating ceramic top coat, both were made by using the plasma spray technology. In general, YSZ coatings deposited by APS are lamellar structural [7,8]. Due to the suddenly increase of micro-structural defects of the conventional TBCs deposited by APS, thermal-cycling lives is very short, which would reduce the conventional coatings applications in aircraft engines [9,10].…”

Section: Introductionmentioning

confidence: 99%

Emission Spectroscope Diagnostics of Direct Current Plasma Jets Used for YSZ Equiaxed Structure Coatings

Sun

Gao

2019

KEM

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This study combines spectroscope diagnostics of the plasma jet under APS and the characterization of sprayed coatings by using nanoparticles yttria partially stabilized zirconia (YSZ) powder. The absolute intensities of ArⅠneutral species spectrum lines were used to estimate the electron excited temperature of the thermal plasma jets by the Boltzmann method. The effects of the detection distances, current intensities and H2 flow rates on electron temperature were analyzed. The plasma sprayed YSZ coatings were heated to 1200°C for 6 min under the atmosphere, and then the micro-structure of the nanostructured powder and coatings were analyzed by using Field Emission Scanning Electron Microscope. The results showed that the increase of input power and H2 content considerably increased the electron temperature, while the electron temperature decreased a lot with the increase of the detection distance. The coatings were consisted of the equiaxed grains and a small-size grain shape pores.

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Durability of plasma sprayed Thermal Barrier Coatings with controlled properties part II: Effects of geometrical curvature

Gildersleeve¹,

Nakamura²,

Sampath³

2021

Surface and Coatings Technology

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Investigation on Failure in Thermal Barrier Coatings on Gas Turbine First-Stage Rotor Blade

Cited by 5 publications

References 14 publications

Assessment of Substrate and TBC Damage Effects on Resonance Frequencies for Blade Health Monitoring

Assessment of Substrate and TBC Damage Effects on Resonance Frequencies for Blade Health Monitoring

Emission Spectroscope Diagnostics of Direct Current Plasma Jets Used for YSZ Equiaxed Structure Coatings

Durability of plasma sprayed Thermal Barrier Coatings with controlled properties part II: Effects of geometrical curvature

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