UO2 fuel pellets fabrication via Spark Plasma Sintering using non-standard molybdenum die

International Conference on Mechanical Engineering and Applied Composite Materials

机械制造;材料科学

Papynov, E.K.^1,2 ; Shichalin, O.O.^1,2 ; Yu Mironenko, A.^1 ; Tananaev, I.G.^1,2 ; Avramenko, V.A.^1,2 ; Sergienko, V.I.^1

Institute of Chemistry, Far Eastern Branch of Russian Academy of Sciences, Prospect 100-let Vladivostoku 159, Vladivostok

690022, Russia^1

Far Eastern Federal University, Suhanova street 8, Vladivostok

690920, Russia^2

关键词: Carbon diffusion;    Chemical compositions;    Highly dense;    Large scale productions;    Mean-grain size;    Nuclear ceramics;    Sintering condition;    Sintering time;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/307/1/012029/pdf
DOI  :  10.1088/1757-899X/307/1/012029

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The article investigates spark plasma sintering (SPS) of commercial uranium dioxide (UO2) powder of ceramic origin into highly dense fuel pellets using non-standard die instead of usual graphite die. An alternative and formerly unknown method has been suggested to fabricate UO2fuel pellets by SPS for excluding of typical problems related to undesirable carbon diffusion. Influence of SPS parameters on chemical composition and quality of UO2pellets has been studied. Also main advantages and drawbacks have been revealed for SPS consolidation of UO2in non-standard molybdenum die. The method is very promising due to high quality of the final product (density 97.5-98.4% from theoretical, absence of carbon traces, mean grain size below 3 μm) and mild sintering conditions (temperature 1100 °C, pressure 141.5 MPa, sintering time 25 min). The results are interesting for development and probable application of SPS in large-scale production of nuclear ceramic fuel.