TY - GEN
T1 - Transmission electron microscopy of isothermally oxidized EB-PVD thermal barrier coating on (Ni, Pt)Al bondcoat
AU - Byeon, J. W.
AU - Laxman, S.
AU - Sohn, Y. H.
PY - 2005
Y1 - 2005
N2 - The growth and microstructure of the thermally grown oxide (TGO) underneath the electron beam physical vapor deposited (EB-PVD) yttria stabilized zirconia (YSZ) topcoat were examined after short-term isothermal oxidation (1100°C, up to 50 hours) for the as-coated and grit-blasted (Ni,Pt)Al bondcoats. Microstructural analysis was carried out by a high resolution scanning transmission electron microscope equipped with bright/dark field imaging, high angle annular dark field imaging, and nano-spot energy dispersive spectroscopy. Presence of mixed oxide zone (MOZ) and a continuous Al2O3 oxide zone (COZ) was observed on the thermal barrier coating (TBC) with the as-coated (Ni,Pt)Al bondcoat. However, on the TBC with grit-blasted bondcoat, only the continuous-columnar Al2O3 scale was observed. For the as-coated type bondcoat, numerous voids were observed near the interface between MOZ and COZ after isothermal oxidation. On the other hand, COZ showed parabolic growth without any formation of voids for the grit-blasted specimens.
AB - The growth and microstructure of the thermally grown oxide (TGO) underneath the electron beam physical vapor deposited (EB-PVD) yttria stabilized zirconia (YSZ) topcoat were examined after short-term isothermal oxidation (1100°C, up to 50 hours) for the as-coated and grit-blasted (Ni,Pt)Al bondcoats. Microstructural analysis was carried out by a high resolution scanning transmission electron microscope equipped with bright/dark field imaging, high angle annular dark field imaging, and nano-spot energy dispersive spectroscopy. Presence of mixed oxide zone (MOZ) and a continuous Al2O3 oxide zone (COZ) was observed on the thermal barrier coating (TBC) with the as-coated (Ni,Pt)Al bondcoat. However, on the TBC with grit-blasted bondcoat, only the continuous-columnar Al2O3 scale was observed. For the as-coated type bondcoat, numerous voids were observed near the interface between MOZ and COZ after isothermal oxidation. On the other hand, COZ showed parabolic growth without any formation of voids for the grit-blasted specimens.
KW - Bond coat surface preparation
KW - Grit blasting
KW - Isothermal oxidation
KW - Thermal barrier coating
KW - Transmission electron microscopy
UR - http://www.scopus.com/inward/record.url?scp=35148837257&partnerID=8YFLogxK
U2 - 10.4028/0-87849-966-0.149
DO - 10.4028/0-87849-966-0.149
M3 - Conference contribution
AN - SCOPUS:35148837257
SN - 0878499660
SN - 9780878499663
T3 - Materials Science Forum
SP - 149
EP - 152
BT - Eco-Materials Processing and Design VI - Proceedings of the 6th International Symposium on Eco-Materials Processing and Design, ISEPD-6
PB - Trans Tech Publications Ltd
T2 - 6th International Symposium on Eco-Materials Processing and Design, ISEPD-6
Y2 - 16 January 2005 through 18 January 2005
ER -