Thickness measurement of thermal barrier coating by pulsed thermography

The component of the hot gas path in gas turbines can survive to very high temperatures because they are protected by ceramic Thermal Barrier Coating (TBC); the failure of such coating can dramatically reduce the component life. A reliable assessment of the Coating integrity and/or an Incipient TBC Damage Detection can help both in optimizing the inspection intervals and in finding the appropriate remedial actions. This study gives the TBC integrity; so other methods are required, like thermography to obtain indications of TBC delamination. Pulsed Thermography detects coating detachments and interface defects, with a large area of view but a spatial resolution of few mm. The mentioned techniques as a whole constitute a powerful tool for the life assessment of thermal barrier coating.

Download Full-text

Topcoat Thickness Measurement of Thermal Barrier Coating of Gas Turbine Blade using Terahertz Wave

IEEJ Transactions on Fundamentals and Materials ◽

10.1541/ieejfms.133.395 ◽

2013 ◽

Vol 133 (7) ◽

pp. 395-401 ◽

Cited By ~ 5

Author(s):

Tetsuo Fukuchi ◽

Norikazu Fuse ◽

Mitsutoshi Okada ◽

Takayuki Ozeki ◽

Tomoharu Fujii ◽

...

Keyword(s):

Gas Turbine ◽

Thermal Barrier Coating ◽

Turbine Blade ◽

Thickness Measurement ◽

Terahertz Wave ◽

Thermal Barrier ◽

Gas Turbine Blade ◽

Barrier Coating

Download Full-text

E223 Thickness measurement of topcoat of thermal barrier coating for gas turbine using terahertz wave

The Proceedings of the National Symposium on Power and Energy Systems ◽

10.1299/jsmepes.2012.17.411 ◽

2012 ◽

Vol 2012.17 (0) ◽

pp. 411-412

Author(s):

Tetsuo FUKUCHI ◽

Norikazu FUSE ◽

Mitsutoshi OKADA ◽

Tomoharu Fujii ◽

Takyuki OZEKI ◽

...

Keyword(s):

Gas Turbine ◽

Thermal Barrier Coating ◽

Thickness Measurement ◽

Terahertz Wave ◽

Thermal Barrier ◽

Barrier Coating

Download Full-text

Topcoat thickness measurement of thermal barrier coating using grating laser acoustic spectrum method

Ceramics International ◽

10.1016/j.ceramint.2021.10.149 ◽

2021 ◽

Author(s):

Cheng Qian ◽

Xing Kou ◽

Cuixiang Pei ◽

Zhenmao Chen

Keyword(s):

Thermal Barrier Coating ◽

Thickness Measurement ◽

Thermal Barrier ◽

Acoustic Spectrum ◽

Spectrum Method ◽

Barrier Coating

Download Full-text

Ageing evaluation of thermal barrier coating: comparison between pulsed thermography and thermal wave interferometry

Quantitative InfraRed Thermography Journal ◽

10.3166/qirt.3.169-182 ◽

2006 ◽

Vol 3 (2) ◽

pp. 169-181 ◽

Cited By ~ 8

Author(s):

Paolo G. Bison ◽

Federico Cernuschi ◽

Ermanno Grinzato

Keyword(s):

Thermal Barrier Coating ◽

Thermal Wave ◽

Thermal Barrier ◽

Pulsed Thermography ◽

Barrier Coating

Download Full-text

Investigation of Delamination in Thermal Barrier Coating by Pulsed Thermography

10.21611/qirt.2018.p29 ◽

2018 ◽

Author(s):

W. Kim ◽

R. Shrestha ◽

S. Myoung

Keyword(s):

Thermal Barrier Coating ◽

Thermal Barrier ◽

Pulsed Thermography ◽

Barrier Coating

Download Full-text

HOT CORROSION OF CERIA-YTTRIA STABILIZED ZIRCONIA PLASMA SPRAYED THERMAL BARRIER COATING BY EUTECTIC VANDIUM PENTAOXIDE-SODIUM SULFATE

THE IRAQI JOURNAL FOR MECHANICAL AND MATERIALS ENGINEERING ◽

10.32852/iqjfmme.vol18.iss1.83 ◽

2018 ◽

Vol 18 (1) ◽

pp. 182-192 ◽

Cited By ~ 1

Author(s):

Mohammed J Kadhim ◽

Mohammed H Hafiz ◽

Maryam A Ali Bash

Keyword(s):

Thermal Barrier Coating ◽

Hot Corrosion ◽

Monoclinic Phase ◽

Volume Fraction ◽

High Volume ◽

Thermal Barrier ◽

Air Plasma ◽

Plan View ◽

Barrier Coating ◽

Plasma Sprayed

The high temperature corrosion behavior of thermal barrier coating (TBC) systemconsisting of IN-738 LC superalloy substrate, air plasma sprayed Ni24.5Cr6Al0.4Y (wt%)bond coat and air plasma sprayed ZrO2-20 wt% ceria-3.6 wt% yttria (CYSZ) ceramic coatwere characterized. The upper surfaces of CYSZ covered with 30 mg/cm2 , mixed 45 wt%Na2SO4-55 wt% V2O5 salt were exposed at different temperatures from 800 to 1000 oC andinteraction times from 1 up to 8 h. The upper surface plan view of the coatings wereidentified for topography, roughness, chemical composition, phases and reaction productsusing scanning electron microscopy, energy dispersive spectroscopy, talysurf, and X-raydiffraction. XRD analyses of the plasma sprayed coatings after hot corrosion confirmed thephase transformation of nontransformable tetragonal (t') into monoclinic phase, presence ofYVO4 and CeVO4 products. Analysis of the hot corrosion CYSZ coating confirmed theformation of high volume fraction of YVO4, with low volume fractions of CeOV4 and CeO2.The formation of these compounds were combined with formation of monoclinic phase (m)from transformation of nontransformable tetragonal phase (t').

Download Full-text