TY - JOUR
T1 - Lanthanum-titanium-aluminum oxide
T2 - A novel thermal barrier coating material for applications at 1300°C
AU - Xie, Xiaoyun
AU - Guo, Hongbo
AU - Gong, Shengkai
AU - Xu, Huibin
PY - 2011/8
Y1 - 2011/8
N2 - Considerable efforts are being invested to explore new thermal barrier coating (TBC) materials with higher temperature capability to meet the demand of advanced turbine engines. In this work, LaTi2Al9O19 (LTA) is proposed and investigated as a novel TBC material for application at 1300°C. LTA showed excellent phase stability up to 1600°C. The thermal conductivities for LTA coating are in a range of 1.0-1.3Wm-1K-1 (300-1500°C) and the values of thermal expansion coefficients increase from 8.0 to 11.2×10-6K-1 (200-1400°C), which are comparable to those of yttria stabilized zirconia (YSZ). The microhardness of LTA and YSZ coatings were in the similar level of ∼7GPa, however, the fracture toughness value was relatively lower than that of YSZ. The lower fracture toughness was compensated by the double-ceramic LTA/YSZ layer design, and the LTA/YSZ TBC exhibited desirable thermal cycling life of nearly 700h at 1300°C.
AB - Considerable efforts are being invested to explore new thermal barrier coating (TBC) materials with higher temperature capability to meet the demand of advanced turbine engines. In this work, LaTi2Al9O19 (LTA) is proposed and investigated as a novel TBC material for application at 1300°C. LTA showed excellent phase stability up to 1600°C. The thermal conductivities for LTA coating are in a range of 1.0-1.3Wm-1K-1 (300-1500°C) and the values of thermal expansion coefficients increase from 8.0 to 11.2×10-6K-1 (200-1400°C), which are comparable to those of yttria stabilized zirconia (YSZ). The microhardness of LTA and YSZ coatings were in the similar level of ∼7GPa, however, the fracture toughness value was relatively lower than that of YSZ. The lower fracture toughness was compensated by the double-ceramic LTA/YSZ layer design, and the LTA/YSZ TBC exhibited desirable thermal cycling life of nearly 700h at 1300°C.
KW - Mechanical properties
KW - Thermal barrier coatings
KW - Thermal conductivity
KW - Thermal expansion
KW - Thermal shock resistance
UR - https://www.scopus.com/pages/publications/79955470633
U2 - 10.1016/j.jeurceramsoc.2011.03.036
DO - 10.1016/j.jeurceramsoc.2011.03.036
M3 - 文章
AN - SCOPUS:79955470633
SN - 0955-2219
VL - 31
SP - 1677
EP - 1683
JO - Journal of the European Ceramic Society
JF - Journal of the European Ceramic Society
IS - 9
ER -