期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 43, 期 5, 页码 2093-2103出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2022.12.061
关键词
Fluorite; Spark Plasma Sintering (SPS); Stabilisation
This study investigated the Spark Plasma Sintering (SPS) of fully stabilised hafnia with yttrium oxide (yttria) and examined the influence of manufacturing parameters on the crystallography, chemistry, and microstructure of the material. It was found that both the amount of yttria and the sintering temperature affected the final composition, lattice parameter, and microstructure of hafnia-based materials. Regardless of the amount of yttrium employed, the main phase was determined to be Y2Hf2O7 with high densification levels.
Hafnia based ceramics are potential promising candidates to be used as thermal barrier coatings (TBC) for ap-plications in the field of propulsion. In this study, Spark Plasma Sintering (SPS) of fully stabilised hafnia with yttrium oxide (yttria) was investigated to provide a better understanding of the effect of manufacturing pa-rameters, on the crystallography, chemistry and microstructure of the material. Several hafnia powders, con-taining different amounts of yttria (33 mol. %, 40 mol. % or 50 mol. %), were sintered by SPS at different temperature levels ranging from 1600 degrees C to 1850 degrees C. On these materials, X-ray diffraction patterns associated with scanning electron micrographs have highlighted the influence of both the sintering temperature and the amount of yttria on the final composition, the lattice parameter and the microstructure of hafnia-based materials. In the end, it is established that, for all quantities of yttrium employed, the main phase is Y2Hf2O7 with very high densification levels.
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