Spark Plasma Sintering of UO2 Nanopowders: Pressure, Heating Rate and Current Effects
We analysed with different methods the densification of UO2 nanopowders in SPS under constant heating rate (CHR) and isothermal sintering conditions. The apparent activation energy of densification in SPS (75 kJ/mol with CHR method) is significantly smaller than in conventional sintering. It is shown that this is likely not an effect of the applied current.
We also observed a threshold stress at 64 MPa for the transition from pressure-insensitive sintering (stress exponent n ≈ 0) to pressure-assisted sintering, suggesting that the contribution of the capillary stresses in such nanopowders is comparable with the typical stress applied in SPS.
MARGUERET Alexandre;
BALICE Luca;
POPA Karin;
HOLZHAEUSER Michael;
DE BONA Emanuele;
BONANI Walter;
BULGHERONI Antonio;
AUDUBERT Fabienne;
COLOGNA Marco;
2022-10-05
ELSEVIER SCI LTD
JRC128807
0955-2219 (online),
www.sciencedirect.com/science/article/pii/S0955221922004204,
https://publications.jrc.ec.europa.eu/repository/handle/JRC128807,
10.1016/j.jeurceramsoc.2022.05.070 (online),
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