Abstract
A doped rare earth zirconate Sm 2 (Zr 0.7 Ce 0.3 ) 2 O 7 for thermal barrier coatings was synthesized by solid reaction between La 2 O 3 ,Ce O 2 and ZrO 2 powders at 1600 °C for 10 hours. The phase composition and microstructure were analyzed by XRD and SEM respectively. And the linear thermal expansion coefficient and thermal conductivity were measured by pushing-rod method and laser-flash method. The analytic results indicated that a single phase Sm 2 (Zr 0.7 Ce 0.3 ) 2 O 7 with fluorite structure was synthesized and the microstructure was dense and no other phase existed among the particles. With the temperature increasing, the thermal expansion coefficient of the ceramic increased, while the thermal conductivity decreased. 'The product had a higher thermal expansion coefficient as compared to Sm 2 Zr 2 O 7 which fulfilled the requirement of thermal barrier coatings. Because the phase transformation from pyrochlore to fluorite, Sm 2 (Zr 0.7 Ce 0.3 ) 2 O 7 had a higher thermal conductivity than Sm 2 Zr 2 O 7 , but the thermal conductivity of synthesized ceramic was still much lower than that of 8YSZ. These results show that Sm 2 (Zr 0.7 Ce 0.3 ) 2 O 7 can be used as a novel candidate material for the ceramic layer in the new thermal barrier coatings system.
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