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The nanostructured 4–8 mol% Gd_2O_3-4.5 mol% Y_2O_3-ZrO_2(4–8 mol% Gd YSZ) coatings were developed by the atmospheric plasma spraying technique. The microstructure and thermal properties of plasmasprayed 4–8 mol% Gd YSZ coatings were investigated. The experimental results indicate that typical microstructure of the as-sprayed coatings were consisted of melted zones, nano-zones, splats, nano-pores,high-volume spheroidal pores and micro-cracks. The porosity of the 4, 6 and 8 mol% Gd YSZ coatings was about 9.3%, 11.7% and 13.3%, respectively. It was observed that the addition of gadolinia to the nano-YSZ could significantly reduce the thermal conductivity of nano-YSZ. The thermal conductivity of Gd YSZ decreased with increasing Gd_2O_3 addition. And the reduction in thermal conductivity is mainly attributed to the addition of Gd_2O_3, which results in the increase in oxygen vacancies, lattice distortion and porosity.
The nanostructured 4-8 mol% Gd_2O_3-4.5 mol% Y_2O_3-ZrO_2 (4-8 mol% Gd YSZ) coatings were developed by the atmospheric plasma spraying technique. The microstructure and thermal properties of plasmasprayed 4-8 mol% Gd YSZ coatings were investigated. The experimental results indicate that typical microstructure of the as-sprayed coatings had consisted of melted zones, nano-zones, splats, nano-pores, high-volume spheroidal pores and micro-cracks. The porosity of the 4, 6 and 8 It was observed that the addition of gadolinia to the nano-YSZ could significantly reduce the thermal conductivity of nano-YSZ. The thermal conductivity of Gd YSZ decreased with gd YSZ coatings was about 9.3%, 11.7% and 13.3% respectively. increasing Gd_2O_3 addition. And the reduction in thermal conductivity is mainly attributed to the addition of Gd_2O_3, which results in the increase in oxygen vacancies, lattice distortion and porosity.