Grain growth and densification of uranium mononitride during spark plasma sintering

With the aim of investigating the spark plasma sintering behavior of uranium mononitride synthesized by the hydride-nitride process, several pellets were prepared using a wide range of fabrication temperatures (1500–1800 °C) and dwell times (5–180 min) under 70 MPa. The collected data in the grain s...

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Bibliographic Details
Published in:Ceramics international 2021-03, Vol.47 (5), p.7258-7262
Main Authors: Kim, Gyeonghun, Ahn, Jungsu, Ahn, Sangjoon
Format: Article
Language:English
Subjects:
Densification
Grain growth
Spark plasma sintering
Uranium nitride fuel
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Summary:With the aim of investigating the spark plasma sintering behavior of uranium mononitride synthesized by the hydride-nitride process, several pellets were prepared using a wide range of fabrication temperatures (1500–1800 °C) and dwell times (5–180 min) under 70 MPa. The collected data in the grain size-density trajectory revealed that the spark plasma sintering process of uranium mononitride was divided into two regimes according to the sintering temperature. In particular, at low temperatures up to 1700 °C, the pellet density increased with increasing temperatures until it reached a maximum value (~97 %TD), while the grain growth was not significant (average grain size 
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2020.11.004