Abstract
High-performance thermal spraying feedstock is of great significance for obtaining high quality plasma-sprayed thermal barrier coatings (TBCs). Rare-earth zirconates TBCs have attracted much more attention so far. In this paper, the nanostructured La2(Zr0.75Ce0.25)2O7 (LCZ) feedstock was fabricated by the nanopowder reconstitution method. The microstructures of the LCZ feedstock were characterized by transmission electron microscopy, X-ray diffraction, Raman spectroscopy and scanning electron microscopy. Moreover, the thermo-physical properties of the LCZ feedstock were also evaluated. The results indicate that the spherical LCZ feedstock with the median particle size (d50) of 37.40 μm consists of only pyrochlore phase. Compared with the nanostructured La2Zr2O7 (LZ) feedstock, the tap density and flowability of the LCZ feedstock are enhanced considerably. As for the LCZ coating, the thermal conductivity is much lower and the thermal expansion coefficient (TEC) is relatively higher than the LZ coating. Therefore, the nanostructured LCZ feedstock can be a promising advanced thermal spraying feedstock used for double ceramic layer TBCs in future.
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