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Densification Mechanism of U3Si2 Consolidated by Spark Plasma Sintering

CERAMICS INTERNATIONAL(2023)

China Acad Engn Phys

Cited 1|Views22
Abstract
The high uranium density and good thermal conductivity at high temperature render U3Si2 an excellent candidate for accident tolerant fuels (ATF). Spark plasma sintering (SPS) is a convenient method to produce U3Si2 fuel and U3Si2-X fuels. However, the densification mechanism of U3Si2 by SPS has been rarely investigated. In this work, U3Si2 pellets were fabricated by SPS with 2 sets of different sintering parameters (the soak samples and the ramp samples). The grain size of U3Si2 pellets sintered by SPS persisted-25 & mu;m when soaked at 900-1300 degrees C and increased to-35 & mu;m at 1400 degrees C. The morphology of the 900 degrees C soak sample was supposed to be due to spark plasma and plastic deformation. Utilizing the Helle-Granger model, the apparent activation energy (Q) and the stress exponent factor (n) can be determined. The soak samples exported n as 2.88, 3.16, and 3.55 (average 3.20) at 900, 1000, and 1100 degrees C, respectively. The ramp samples exported Q as 355.57, 325.48, 343.04, and 377.04 kJ/mol (average 350.28 kJ/mol) and n as 4.67, 4.22, 4.04, and 3.52 (average 4.11) at 65, 70, 75, and 80%TD, respectively. The n values of the two set of samples were both consistent with the suspected deformation hints in SEM. These results suggest that densification of SPS-sintered U3Si2 occurred via plastic deformation controlled by dislocation motion.
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Key words
Spark plasma sintering,Densification mechanism,Activation energy,Stress exponent factor,U3Si2
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