Single-step, high pressure, and two-step spark plasma sintering of UO2 nanopowders
Source abstract
Abstract
Three different spark plasma sintering (SPS) treatments were applied to highly sinteractive, near-stoichiometric UO2.04 nanocrystalline (5 nm) powders produced by U(IV) oxalate hydrothermal decomposition at 170 °C. The sintering conditions for reaching 95 % theoretical density (TD) in regular SPS, high pressure SPS (HP-SPS), and, for the first time, two-step SPS (2S-SPS), were determined. Densification to 95 % TD was achieved at 1000 °C in regular SPS (70 MPa applied pressure), 660 °C in HP-SPS (500 MPa), and 650−550 °C in 2S-SPS (70 MPa). With the goal of minimising the grain growth during densification, the sintering treatments were optimised to favour densification over coarsening, and the final microstructures thus obtained are compared. Equally dense UO2 samples of different grain sizes, ranging from 3.08 μm to 163 nm, were produced. Room-temperature oxidation of the powders could not be avoided due to their nanometric dimensions, and a final annealing treatment was designed to reduce hyperstoichiometric samples to UO2.00.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Nuclear Materials and Properties · Nuclear materials and radiation effects · Radioactive element chemistry and processing
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (52)
Show source-provided references
1. Spatial distribution of U238 resonance neutron capture in uranium metal rods10.13182/NSE58-A25505 ↗
2. Detailed characterisations of high burn-up structures in oxide fuels10.1016/j.jnucmat.2007.04.037 ↗
3. The high burn-up structure in nuclear fuel10.1016/S1369-7021(10)70221-2 ↗
4. Transmission electron microscopy observation on irradiation-induced microstructural evolution in high burn-up UO2 disk fuel10.1016/S0168-583X(02)00622-5 ↗
5. Recent results of microstructural characterization of irradiated light water reactor fuels using scanning and transmission Electron microscopy10.1007/s11837-012-0483-1 ↗
6. Properties of the high burnup structure in nuclear light water reactor fuel10.1515/ract-2017-2831 ↗
7. Effect of burn-up on the thermal conductivity of uranium dioxide up to 100.000 MWdt-110.1016/j.jnucmat.2004.01.018 ↗
8. EPMA and SEM of fuel samples from PWR rods with an average burn-up of around 100 MWd/kgHM10.1016/S0022-3115(01)00753-X ↗
9. Thermal conductivity of SIMFUEL10.1016/0022-3115(92)90471-V ↗
10. Specific heat of UO2-based SIMFUEL10.1016/S0022-3115(97)00069-X ↗
11. Oversby · 1999
12. Cacuci · 2010
13. Kok · 2009
14. Influence of processing parameters on thermal conductivity of uranium dioxide pellets prepared by spark plasma sintering10.1016/j.jeurceramsoc.2014.01.018 ↗
15. Master sintering curves for UO2 and UO2–SiC composite processed by spark plasma sintering10.1016/j.jnucmat.2014.08.023 ↗
16. Simulated UO2 fuel containing CsI by spark plasma sintering10.1016/j.jnucmat.2015.07.030 ↗
17. Contribution to the study of fission products release from nuclear fuels in severe accident conditions: effect of the pO2 on Cs, Mo and Ba speciation
18. Sub-micrometre grained UO2 pellets consolidated from sol gel beads using spark plasma sintering (SPS)10.1016/j.ceramint.2015.12.172 ↗
19. Preparation of bulk-nanostructured UO2 pellets using high-pressure spark plasma sintering for LWR fuel safety assessment10.1111/jace.14647 ↗
20. Dense nanocrystalline UO 2+ x fuel pellets synthesized by high pressure spark plasma sintering10.1111/jace.15289 ↗
21. Grain growth and pore coarsening in dense nano‐crystalline UO2+x fuel pellets10.1111/jace.14780 ↗
22. Nano- and micro-indentation testing of sintered UO2 fuel pellets with controlled microstructure and stoichiometry10.1016/j.jnucmat.2019.01.021 ↗
23. Synthesis of nanostructured ThO2 pellets10.1111/jace.16375 ↗
24. Sintering dense nanocrystalline ceramics without final-stage grain growth10.1038/35004548 ↗
25. Suppression of grain growth in sub-micrometer alumina via two-step sintering method10.1016/j.jeurceramsoc.2008.08.027 ↗
26. Two-step sintering of nanocrystalline 8Y2O3 stabilized ZrO2 synthesized by glycine nitrate process10.1016/j.ceramint.2007.09.009 ↗
27. Densification and grain growth of nanocrystalline 3Y-TZP during two-step sintering10.1016/j.jeurceramsoc.2008.04.030 ↗
28. Two-step sintering of fine alumina–zirconia ceramics10.1016/j.ceramint.2008.08.001 ↗
29. Densification of UO2 via two step sintering
30. Two-step sintering assisted consolidation of bulk titania nano-ceramics by spark plasma sintering10.1016/j.ceramint.2012.01.011 ↗
31. Two step sintering of cubic yttria stabilized zirconia using field assisted sintering technique/spark plasma sintering10.1016/j.jeurceramsoc.2012.10.002 ↗
32. Low temperature decomposition of U(IV) and Th(IV) oxalates to nanograined oxide powders10.1016/j.jnucmat.2015.02.027 ↗
33. From uranium(IV) oxalate to sintered UO2 : consequences of the powders’ thermal history on the microstructure10.1016/j.jeurceramsoc.2015.07.010 ↗
34. Sintering behaviour of nanocrystalline ThO2 powder using spark plasma sintering10.1016/j.jeurceramsoc.2015.11.006 ↗
35. Morphology dependent sintering path of nanocrystalline ThO210.1016/j.jnucmat.2020.152081 ↗
36. Hydrothermal decomposition of actinide(IV) oxalates: a new aqueous route towards reactive actinide oxide nanocrystals10.1515/chem-2016-0018 ↗
37. A low-temperature synthesis method for AnO2 nanocrystals (An = Th, U, Np, and Pu) and associate solid solutions10.1039/C8CE00446C ↗
38. Nano and micro U1-x Thx O2 solid solutions: from powders to pellets10.1016/j.jnucmat.2017.10.042 ↗
39. Hydrothermal conversion of uranium(IV) oxalate into oxides: a comprehensive study10.1021/acs.inorgchem.9b03672 ↗
40. A pragmatic approach to modelling thermal conductivity of irradiated UO2 fuel: review and recommendations10.1016/S0022-3115(96)00404-7 ↗
41. Thermodynamic and thermophysical properties of the actinide oxides
42. Olander · 1976
43. sintering and reactive sintering by spark plasma sintering (SPS)
44. Implementation of a spark plasma sintering facility in a hermetic glovebox for compaction of toxic, radiotoxic, and air sensitive materials10.1063/1.4913529 ↗
45. Crystallographic computing system JANA2006: general features10.1515/zkri-2014-1737 ↗
46. Investigation of the oxygen activity of oxide fuels and fuel-fission product systems by solid electrolyte techniques. Part I: qualification and limitations of the method10.1016/0022-3115(83)90110-1 ↗
47. X-ray line broadening from filed aluminium and wolfram10.1016/0001-6160(53)90006-6 ↗
48. 2012 · 1
49. Consistent indexing of a (set of) single crystal SAED pattern(s) with the ProcessDiffraction program10.1016/j.ultramic.2004.12.004 ↗
50. Changements de structure de l’oxyde U4O910.1016/0022-3697(67)90070-4 ↗
51. On uranium self-diffusion in UO2 and UO2+x10.1016/0022-3115(69)90165-2 ↗
52. Microstructural control in the processing of electronic ceramics10.1016/0025-5416(81)90066-5 ↗