Abstract
In this study, a highly porous TBC based on Gd2O3–Yb2O3 co-doped YSZ was produced by plasma spraying using a spray powder, specially prepared by high energy ball milling. The coating was characterized in terms of the microstructure, phase composition, hardness and thermal conductivity. The thermal shock behavior was evaluated using thermal cyclic test at T = 1150 °C. A free-standing coating was heat-treated in a furnace at T = 1150 °C for t = 500 h to investigate the effect of sintering on the microstructure and properties of the coating. Results revealed that the coating in as-sprayed condition exhibited a highly porous microstructure with a porosity of p = 39%. The highly porous TBC presented a better thermal shock behavior compared to a conventional TBC. After heat-treatment, the value of porosity dropped to p = 26%, which still corresponds to a highly porous microstructure. Both the thermal conductivity and hardness of the coating significantly increased due to sintering. However, the coating exhibited low thermal conductivity values of к < 1.1 W/m·K at high temperatures.
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