Revisiting the sintering of uranium dioxide

IF 5.8 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society Pub Date : 2024-11-06 DOI:10.1016/j.jeurceramsoc.2024.117032

Kaythleen Torrente , Christelle Duguay , Franck Doreau , F. Lebreton , Guillaume Bernard-Granger

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Abstract

The sintering of uranium dioxide was investigated for humidified Ar/5 vol% H₂ gas mixtures up to 1700 °C. Three relative humidity levels were used: 100, 1200 and 7500 vpm. The sintering map has been built. It is unique and independent of the thermo-atmospheric conditions of the sintering cycle. All samples have a

O / U

ratio of around 2.00. Whatever the value of the relative humidity level of the sintering gas mixture, it is proposed that densification is controlled by volume diffusion of the uranium cations and that grain growth is controlled by the grain boundaries. An apparent activation energy for densification has been calculated. The parameters of a shortened sintering cycle are finally proposed. They allow a reduction of approximately 50 % in the cold-to-cold duration, compared to what is currently done in the context of the manufacture of uranium dioxide fuel pellets for PWR reactors.

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重新审视二氧化铀的烧结

在温度高达 1700 ℃ 的加湿氩气/5 vol% H2 混合气体条件下，对二氧化铀的烧结进行了研究。采用了三种相对湿度水平：100、1200 和 7500 vpm。烧结图已经绘制完成。它是独一无二的，与烧结循环的热大气条件无关。所有样品的 O/U 比率都在 2.00 左右。无论烧结气体混合物的相对湿度水平为多少，都表明致密化是由铀阳离子的体积扩散控制的，而晶粒生长则是由晶界控制的。计算出了致密化的表观活化能。最后提出了缩短烧结周期的参数。与目前生产压水堆用二氧化铀燃料芯块的工艺相比，缩短烧结周期可将冷到冷的持续时间缩短约 50%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of The European Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

10.70

自引率

12.30%

发文量

863

审稿时长

35 days

期刊介绍： The Journal of the European Ceramic Society publishes the results of original research and reviews relating to ceramic materials. Papers of either an experimental or theoretical character will be welcomed on a fully international basis. The emphasis is on novel generic science concerning the relationships between processing, microstructure and properties of polycrystalline ceramics consolidated at high temperature. Papers may relate to any of the conventional categories of ceramic: structural, functional, traditional or composite. The central objective is to sustain a high standard of research quality by means of appropriate reviewing procedures.