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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