期刊
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
卷 105, 期 3, 页码 2161-2170出版社
WILEY
DOI: 10.1111/jace.18185
关键词
high temperatures; laser heating; mass spectrometry; vaporization; zirconia
资金
- TCOFF
- TCOFF (Thermodynamic Characterisation of Fuel Debris and Fission Products) project
The evaporation behavior of ZrO2 and Zr-Fe-O systems was investigated in this study using heating with laser pulses of millisecond duration and time-of-flight mass spectrometry. The findings suggest that evaporation of zirconia occurs in a noncongruent mode at temperatures above 3000 K, while the evaporation of the Zr-Fe-O system is greatly influenced by the fast evaporation of FeO.
Material systems such as U-Zr-O, Fe-Zr-O, and Zr-O have been recognized as fundamental for the analysis of in-vessel nuclear fuel debris behavior during a severe meltdown accident. In the present work, the evaporation behavior of ZrO2 and Zr-Fe-O systems are investigated using heating with laser pulses of millisecond duration and time-of-flight mass spectrometry. The relative partial pressures of main species of vapor over ZrO2 and ZrO2-FeO systems were measured at temperatures above 2750 K. The temperature dependence of O/Zr atomic ratio in vapor over zirconia was analyzed: it turned out that evaporation occurs in a noncongruent mode at temperatures above 3000 K. Evaporation of the Zr-Fe-O system was greatly affected by the fast evaporation of FeO, implying that the atomic Zr/Fe ratio, less than 0.1 below 3000 K, significantly increased with temperature. Moreover, the ratios of main vapor components were defined only by the surface temperature, independent of the zirconia sample origin.
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