TY - JOUR
T1 - The effect of pre-oxidation atmosphere on the durability of EB-PVD thermal barrier coatings with CoNiCrAlY bond coats
AU - Matsumoto, Mineaki
AU - Kato, Takeharu
AU - Hayakawa, Kazuyuki
AU - Yamaguchi, Norio
AU - Kitaoka, Satoshi
AU - Matsubara, Hideaki
N1 - Funding Information:
This work was supported by NEDO under the “Nanotechnology Materials Program/the Nanostructure Coating Project” promoted by METI, Japan.
PY - 2008/3/15
Y1 - 2008/3/15
N2 - The effects of pre-oxidation heat treatment on oxidation behavior and thermal cycle life of electron-beam physical deposited (EB-PVD) thermal barrier coatings (TBCs) with CoNiCrAlY bond coats were investigated as a function of the pO2 of the pre-oxidation atmosphere. The pO2 of the pre-oxidation atmosphere was controlled by using a solid-state electrochemical oxygen pump system. The purity and microstructure of the continuous Al2O3 layer formed on the bond coat during pre-oxidation at 1050 °C were highly influenced by the pO2 of the atmosphere. High purity α-Al2O3 with large grain size was formed on the bond coats under a pO2 of 10- 12-10- 9 Pa, which resulted in a lower growth rate of TGO and longer lifetime.
AB - The effects of pre-oxidation heat treatment on oxidation behavior and thermal cycle life of electron-beam physical deposited (EB-PVD) thermal barrier coatings (TBCs) with CoNiCrAlY bond coats were investigated as a function of the pO2 of the pre-oxidation atmosphere. The pO2 of the pre-oxidation atmosphere was controlled by using a solid-state electrochemical oxygen pump system. The purity and microstructure of the continuous Al2O3 layer formed on the bond coat during pre-oxidation at 1050 °C were highly influenced by the pO2 of the atmosphere. High purity α-Al2O3 with large grain size was formed on the bond coats under a pO2 of 10- 12-10- 9 Pa, which resulted in a lower growth rate of TGO and longer lifetime.
KW - Oxygen partial pressure
KW - Pre-oxidation
KW - Thermal barrier coating
KW - Thermally grown oxide
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U2 - 10.1016/j.surfcoat.2007.10.001
DO - 10.1016/j.surfcoat.2007.10.001
M3 - Article
AN - SCOPUS:44249114600
SN - 0257-8972
VL - 202
SP - 2743
EP - 2748
JO - Surface and Coatings Technology
JF - Surface and Coatings Technology
IS - 12
ER -