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Microstructures of Y 2 O 3 ‐Stabilized ZrO 2 Electron Beam‐Physical Vapor Deposition Coatings on Ni‐Base Superalloys
Author(s) -
Unal Ozer,
Mitchell Terrence E.,
Heuer Arthur H.
Publication year - 1994
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.1151-2916.1994.tb07256.x
Subject(s) - superalloy , thermal barrier coating , materials science , microstructure , coating , electron beam physical vapor deposition , physical vapor deposition , chemical vapor deposition , ceramic , transmission electron microscopy , substrate (aquarium) , deposition (geology) , metallurgy , composite material , chemical engineering , nanotechnology , paleontology , sediment , biology , oceanography , geology , engineering
The microstructures of ZrO 2 –20 wt% Y 2 O 3 thermal barrier coatings formed by electron beam‐physical vapor deposition on a Nibase superalloy have been studied by transmission electron microscopy. The coating systems consist of several layers, including a superalloy substrate, a bond coat, an Al 2 O 3 scale, and the PVD coating. The overall ceramic thermal barrier coatings were characterized, with special emphasis being given to the α‐Al 2 O 3 scale which forms between the bond coat and the ZrO 2− Y 2 O 3 coating. The oxide scale exhibited various morphologies in different coating systems; the majority of the porosity formed in this region for all coatings.