Abstract
Thermal barrier coatings consisting of ZrO_2-8wt%Y_2O_3 and NiCoCrAlY bond coat on a Ni base superalloy are used as test specimens. The indentation fatigue tests are conducted before and after thermal exposure test. The TGO layer increases with increase of thermal exposure time up to 200h. The interfacial damage is observed using scanning electronic microscope and digital microscope, which confirms growth of interfacial crack in TGO layer and spalling of coating layer after thermal exposure of 200h.
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