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- W4376142371 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 μm when soaked at 900–1300 °C and increased to ∼35 μm at 1400 °C. The morphology of the 900 °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 °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." @default.
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- W4376142371 date "2023-08-01" @default.
- W4376142371 modified "2023-10-17" @default.
- W4376142371 title "Densification mechanism of U3Si2 consolidated by spark plasma sintering" @default.
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- W4376142371 doi "https://doi.org/10.1016/j.ceramint.2023.05.110" @default.
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