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Degradation Mechanisms of ZrO 2 –8 wt% Y 2 O 3 /Ni‐22Cr‐10Al‐1Y Thermal Barrier Coatings
Author(s) -
Wu BoChen,
Chang Edward,
Chang ShihFeng,
Tu David
Publication year - 1989
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.1151-2916.1989.tb06103.x
Subject(s) - thermal barrier coating , materials science , temperature cycling , sintering , superalloy , coating , atmospheric temperature range , oxide , degradation (telecommunications) , metallurgy , composite material , phase (matter) , alloy , thermal , chemistry , telecommunications , physics , organic chemistry , meteorology , computer science
Duplex ZrO 2 –8 wt% Y 2 O 3 /Ni‐22Cr‐10Al‐1Y thermal barrier coatings (TBCs) on Mar‐M247 superalloy were tested under different operating conditions within the temperature range 1000° to 1150°C. Results of experiments in this study show that oxidation of bond coatings is the dominant TBC degradation mechanism whereas the operationally induced stresses exert a conjugate effect. The mechanisms of sintering and phase transformation of top coatings do not contribute to failure of TBCs within the temperature range studied. NiO and Ni(Cr,Al) 2 O 4 grown on the surfaces of the bond coatings seem to accelerate spalling of the top coatings along a top coating/bond coating out‐grown oxide interface. However, it is also concluded that the lifetime of TBCs is not directly related to a critical specific weight gain under thermal cycling conditions.