Low thermal conductivity and high temperature stability of ZrO2–Y2O3–La2O3 coatings produced by electron beam PVD

Advanced Ceramic Materials for High Temperature Applications

“…Moreover, when the coating is annealed at 1200°C for 50 h, the thermal conductivity of the "doped" material increases only up to 1.2 W·m -1 ·K -1 , in contrast to 2.1 W·m -1 ·K -1 for YSZ, conferring a higher temperature stability to the TBC. [45] Hafnia-containing compositions have been also investigated, both zirconia-based and zirconia-free materials. The lowest thermal conductivity determined at 1316°C has been obtained for zirconia-free 25 wt % yttria-stabilized hafnia, [46] with a value of 1.1 W·m -1 ·K -1 , having at the same time low rate of conductivity increase, and good sintering resistance, as compared with YSZ.…”

Comparison of Thermal Shock Behavior of 7ysz, 15ysz and Sysz Thermal Barrier Coatings Produced by Aps Method

“…Therefore, investigation of novel TBC materials with ultra-high temperature capability, low thermal conductivity and long-term life time is a key problem for the next generation of turbine engines. Some ceramic materials such as La 2 O 19 and other kinds of rare earth doped zirconia [9][10][11][12][13][14][15][16][17][18][19] have been investigated as potential TBC materials. In recent years, nanostructured zirconia based TBCs deposited by atmospheric plasma spraying have been the focus of attention.…”

Mechanical Properties of LaTi2Al9O19 and Thermal Cycling Behaviors of Plasma-Sprayed LaTi2Al9O19/YSZ Thermal Barrier Coatings

“…Some ceramic materials, such as La 2 O 3 -Y 2 O 3 -ZrO 2 , Gd 2 O 3 -Y 2 O 3 -ZrO 2 , La 2 Zr 2 O 7 (LZ), La 2 Ce 2 O 7 (LC), LaMgAl 11 O 19 (LMA) and other rare earth-doped zirconia, have been investigated as potential TBC materials (Ref [10][11][12][13][14]. Previous investigations showed good physical properties of these materials, such as lower thermal conductivity and higher thermal stability ( Ref 12,13,15).…”