TY  - JOUR
AU  - Nies, Daniel
AU  - Rehmer, Birgit
AU  - Skrotzki, Birgit
AU  - Vaßen, Robert
TI  - Damage Characterization of Thermal Barrier Coatings by Acoustic Emission and Thermography
JO  - Advanced engineering materials
VL  - 14
IS  - 9
SN  - 1438-1656
CY  - Weinheim
PB  - Wiley-VCH Verl.
M1  - FZJ-2014-00888
SP  - 790 - 794
PY  - 2012
AB  - Thermal barrier coatings allow increasing the operating temperature and efficiency of land-, sea-, or air-based turbines. As failure of the coating may result in serious damage of the turbine, reliable estimation of its lifetime is essential. To assess the lifetime, cyclic tests are conceived to combine thermal loading by heating the surface of the coating with laser irradiation and nondestructive methods for damage determination. Using laser irradiation allows a high reproducibility of the thermal load. The temperature of the sample surface during thermal loading is determined by an infrared-camera which also enables the possibility to detect damage in the coating via thermography. Additionally, four acoustic sensors, attached to the experimental setup, are used to detect damage in the sample and determine the source of acoustic events. Results of acoustic emission correlate well with thermographic images that visualize the formation and evolution of damage through delaminations in the samples.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000308254000006
DO  - DOI:10.1002/adem.201200107
UR  - https://juser.fz-juelich.de/record/150853
ER  -