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RAN Shuming, GUO Yi. Thermophysical Performances of (Sm0.5Nd0.5)3Ce7Ta2O23.5 and(Yb0.5Dy0.5)3Ce7Ta2O23.5 Oxides[J]. Materials and Mechanical Engineering, 2022, 46(6): 21-25,30. DOI: 10.11973/jxgccl202206004
Citation: RAN Shuming, GUO Yi. Thermophysical Performances of (Sm0.5Nd0.5)3Ce7Ta2O23.5 and(Yb0.5Dy0.5)3Ce7Ta2O23.5 Oxides[J]. Materials and Mechanical Engineering, 2022, 46(6): 21-25,30. DOI: 10.11973/jxgccl202206004

Thermophysical Performances of (Sm0.5Nd0.5)3Ce7Ta2O23.5 and(Yb0.5Dy0.5)3Ce7Ta2O23.5 Oxides

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  • Received Date: January 31, 2021
  • Revised Date: March 13, 2022
  • Taking Sm2O3, NdO3, Dy2O3, Yb2O3, CeO2 and Ta2O5 with high purity as raw materials, (Sm0.5 Nd0.5)3Ce7Ta2O23.5 and (Yb0.5Dy0.5)3Ce7Ta2O23.5 oxides were synthesized by multi-step solid phase sintering at high temperature, and the crystalline structure, micromorphology and thermophysical properties were investigated. The results show that obtained oxides exhibited single fluorite structure. The microstructure was dense, and the interfaces among grains were very clean. The element composition and the atom ratio were consistent with the chemical formula. The thermal conductivity of the two oxides was obviously lower than that of 7YSZ, and the thermal conductivity of (Yb0.5Dy0.5)3Ce7Ta2O23.5 was lower than that of (Sm0.5Nd0.5)3Ce7Ta2O23.5. The thermal expansion coefficient above 900℃ of (Yb0.5Dy0.5)3Ce7Ta2O23.5 was slightly higher than that of (Sm0.5Nd0.5)3Ce7Ta2O23.5, and thermal expansion coefficients at 1 200℃ of two oxides were 12.2×10-6,12.5×10-6 K-1,respectively, which were much higher than 9×10-6 K-1 of 7YSZ. The thermal conductivity and expansion coefficient of the two oxides satisfied the requirements for thermal barrier coatings.
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