TY - JOUR
T1 - Distribution and structures of nanopores in YSZ-TBC deposited by EB-PVD
AU - Jung, Yun Chul
AU - Sasaki, Takeo
AU - Tomimatsu, Toru
AU - Matsunaga, Katsuyuki
AU - Yamamoto, Takahisa
AU - Kagawa, Yutaka
AU - Ikuhara, Yuichi
N1 - Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2003/11
Y1 - 2003/11
N2 - Distribution and arrangement of nanopores in an YSZ (7wt% Y 2O3-ZrO2)-thermal barrier coating (TBC) deposited by an electron beam-physical vapor deposition (EB-PVD) have been investigated by means of transmission electron microscopy. The YSZ-TBC deposited by the EB-PVD showed a typical columnar structure normal to the bond coat surface on the substrate. It has been generally believed that one column is a single crystal and grows continuously from the substrate. In the present study, however, it was found that each column consisted of a number of subcolumns with different misorientations and contained nanopores at the subcolumn boundaries. In addition to the nanopores at the subcolumn boundaries, nanopores with smaller size were observed within subcolumns, and were arranged periodically perpendicular to the growth direction of the subcolumns. Such arrangement and distribution of nanopores may be due to the misorientation of YSZ plate-like grains in the formation and coalescence processes of the YSZ subcolumns.
AB - Distribution and arrangement of nanopores in an YSZ (7wt% Y 2O3-ZrO2)-thermal barrier coating (TBC) deposited by an electron beam-physical vapor deposition (EB-PVD) have been investigated by means of transmission electron microscopy. The YSZ-TBC deposited by the EB-PVD showed a typical columnar structure normal to the bond coat surface on the substrate. It has been generally believed that one column is a single crystal and grows continuously from the substrate. In the present study, however, it was found that each column consisted of a number of subcolumns with different misorientations and contained nanopores at the subcolumn boundaries. In addition to the nanopores at the subcolumn boundaries, nanopores with smaller size were observed within subcolumns, and were arranged periodically perpendicular to the growth direction of the subcolumns. Such arrangement and distribution of nanopores may be due to the misorientation of YSZ plate-like grains in the formation and coalescence processes of the YSZ subcolumns.
KW - Electron beam-physical vapor deposition
KW - Nanopore
KW - Thermal barrier coating
KW - Yttria-stabilized zirconia
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U2 - 10.1016/j.stam.2003.12.002
DO - 10.1016/j.stam.2003.12.002
M3 - Article
AN - SCOPUS:1642280528
VL - 4
SP - 571
EP - 574
JO - Science and Technology of Advanced Materials
JF - Science and Technology of Advanced Materials
SN - 1468-6996
IS - 6
ER -