Abstract
Oxide ceramics with stable phase structure, good thermophysical properties and high sintering-resistance above 1473K have very important applications in thermal barrier coatings (TBCs). The (Y0.05La0.95)2(Zr0.7Ce0.3)2O7 (YLZC) ceramics were synthesized by solid state reaction at 1673K for 24h in air. The phase stability, thermophysical properties and sintering-resistance behavior of YLZC ceramics were investigated in detail. The YLZC ceramics consist of mixture structures of pyrochlore and fluorite, and no new phase appears after long-term annealing. Thermal expansion coefficient of YLZC is about 10.58×10−6K−1, which is larger than that of La2Zr2O7 (LZ) (9.18×10−6K−1) and similar to that of La2(Zr0.7Ce0.3)2O7 (LZC) (10.53×10−6K−1). The thermal conductivities of the YLZC ceramics first decrease gradually with the increase of temperature below 1273K and then increase slightly above 1273K. The minimum value of ~0.86Wm−1K−1 is gained at 1273K. The volume shrinkages of LZC and YLZC are basically identical, only a bit of improvement in sintering-resistance is observed at 1873K.
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