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Erosion‐Indicating Thermal Barrier Coatings Using Luminescent Sublayers
Author(s) -
Eldridge Jeffrey I.,
Singh Jogender,
Wolfe Douglas E.
Publication year - 2006
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2006.01210.x
Subject(s) - thermal barrier coating , materials science , cubic zirconia , yttria stabilized zirconia , composite material , ingot , erosion , doping , dopant , chemical vapor deposition , luminescence , scanning electron microscope , physical vapor deposition , mineralogy , coating , nanotechnology , ceramic , optoelectronics , geology , paleontology , alloy
A successful approach to producing thermal barrier coatings (TBCs) that are self‐indicating for location and depth of erosion is presented. Erosion indication is demonstrated in electron‐beam physical vapor‐deposited (EB‐PVD) TBCs consisting of 7 wt% yttria‐stabilized zirconia (7YSZ) with europium‐doped and terbium‐doped sublayers. Multiple‐ingot deposition was utilized to deposit doped layers with sharp boundaries in dopant concentration without disrupting the columnar growth that gives EB‐PVD TBCs their desirable strain tolerance. TBC‐coated specimens were subjected to alumina‐particle‐jet erosion, and the erosion depth was indicated under ultraviolet illumination by the luminescence associated with the sublayers exposed by erosion. Sufficiently distinct luminescent sublayer boundaries were retained to maintain an effective erosion‐indicating capability even after annealing free‐standing TBCs at 1400°C for 100 h.