Title of article :
Lanthanum–titanium–aluminum oxide: A novel thermal barrier coating material for applications at 1300 °C
Author/Authors :
Xie، نويسنده , , Xiaoyun and Guo، نويسنده , , Hongbo and Gong، نويسنده , , Shengkai and Xu، نويسنده , , Huibin، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2011
Abstract :
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 1.0–1.3 W m−1 K−1 (300–1500 °C) and the values of thermal expansion coefficients increase from 8.0 to 11.2 × 10−6 K−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 ∼7 GPa, 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 700 h at 1300 °C.
Keywords :
mechanical properties , Thermal barrier coatings , Thermal expansion , Thermal shock resistance , thermal conductivity
Journal title :
Journal of the European Ceramic Society
Journal title :
Journal of the European Ceramic Society