Abstract
Yb 2O 3 (10 mol%) and Gd 2O 3 (20 mol%) doped SrZrO 3 was investigated as a material for thermal barrier coating (TBC) applications. The thermal expansion coefficients (TECs) of sintered bulk Sr(Zr 0.9Yb 0.1)O 2.95 and Sr(Zr 0.8Gd 0.2)O 2.9 were recorded by a high-temperature dilatometer and revealed a positive influence on phase transformations of SrZrO 3 by doping Yb 2O 3 or Gd 2O 3. The results for the thermal conductivities of Sr(Zr 0.9Yb 0.1)O 2.95 and Sr(Zr 0.8Gd 0.2)O 2.9 indicated that both dopants can reduce the thermal conductivity of SrZrO 3. Mechanical properties (Young's modulus, hardness, and fracture toughness) of dense Sr(Zr 0.9Yb 0.1)O 2.95 and Sr(Zr 0.8Gd 0.2)O 2.9 showed lower Young's modulus, hardness and comparable fracture toughness with respect to YSZ. The cycling lifetimes of Sr(Zr 0.9Yb 0.1)O 2.95/YSZ and Sr(Zr 0.8Gd 0.2)O 2.9/YSZ double layer coatings (DLC), which were prepared by plasma spraying, were comparable to that of YSZ at operating temperatures <1300 °C. However, the cycling lifetime of Sr(Zr 0.9Yb 0.1)O 2.95/YSZ DLC was ∼25% longer, whereas Sr(Zr 0.8Gd 0.2)O 2.9/YSZ DLC had a shorter lifetime compared to the optimized YSZ coating at operating temperatures >1300 °C.
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