Cermet surrogate nuclear fuels from coated powders
نویسندگان
چکیده
• Initial coatings improve the microstructure of surrogate fuel elements. coating thickness is crucial in tuning microstructure. Potential for elements with greater than 60 vol.% fissile exists. Higher fractions would result improved efficiency and decreased weight. Nuclear thermal propulsion (NTP), which may utilize cermet fuels, shows promise improving feasibility long-distance space travel. These fuels are composed a ceramic nuclear phase, such as UO 2 or UN, protective refractory metal (W Mo) phase. In this work, material system consisting tungsten-yttria stabilized zirconia (W-YSZ) were fabricated via spark plasma sintering . Prior to consolidation, magnetron sputtering was utilized provide conformal W YSZ particles, 80 550 nm thickness. coatings, when excess powder added, found reduce ceramic-ceramic contacts well densification over powders that not coated. Furthermore, at least 350 nm, additional added yield metallic fraction 32 vol.%, remained nearly identical higher fractions. This suggests coated particles necessary amount matrix, turn neutron poisoning, lower element weight, increase content from conventional NTP cermets.
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ژورنال
عنوان ژورنال: Journal of Nuclear Materials
سال: 2021
ISSN: ['1873-4820', '0022-3115']
DOI: https://doi.org/10.1016/j.jnucmat.2021.153246