Thermophysical Performances of (Sm0.5Gd0.2Nd0.3)2(Hf0.3Ce0.7)2O7 Composite Oxides

Abstract

Abstract: In order to develop novel ceramic material for thermal barrier coatings, the (Sm_0.5Gd_0.2 Nd_0.3)₂(Hf_0.3Ce_0.7)₂O₇ composite oxides were synthesized by high temperature sintering method in this paper. Its lattice-type was analyzed by XRD, the microstructure was analyzed by SEM, thermal expansion property was tested by thermal expansion instrument, and thermal diffusivity was measured by laser thermal laser conductor-meter. Results show that the pure (Sm_0.5Gd_0.2Nd_0.3)₂(Hf_0.3Ce_0.7)₂O₇ with single fluorite lattice was synthesized. The microstructure is very dense, and interfaces between boundaries are very clean, no other phases can be found. Owing to the complex element constituent and high atomic weight, its thermal conductivity is lower than those of 7YSZ and Sm₂Ce₂O₇. The relative low thermal expansion coefficient of (Sm_0.5Gd_0.2Nd_0.3)₂(Hf_0.3Ce_0.7)₂O₇ can be contributed to the lower ionic radius of cations at B sites, while the thermal expansion coefficient meets to the requirement for thermal barrier coatings.

Key words: rare earth cerium oxide, high temperature sintering method, thermal barrier coating, thermal conductivity, thermal expansion coefficient

CLC Number:

V263
TQ174.1

RAN Shuming, GUO Yi. Thermophysical Performances of (Sm_0.5Gd_0.2Nd_0.3)₂(Hf_0.3Ce_0.7)₂O₇ Composite Oxides[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2021, 50(5): 933-937.

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Thermophysical Performances of (Sm_0.5Gd_0.2Nd_0.3)₂(Hf_0.3Ce_0.7)₂O₇ Composite Oxides

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