掺杂铌氧化物的缓冲二氧化铀燃料的烧结特性

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

Journal of The European Ceramic Society Pub Date : 2024-11-07 DOI:10.1016/j.jeurceramsoc.2024.117049

Shalane Gobert , Fabienne Audubert , Jean-Marc Heintz

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引用次数: 0

摘要

目前正在开发一种掺杂氧化还原缓冲剂的创新型核燃料，以控制反应堆内的氧分压（pO2），从而限制包壳的应力腐蚀开裂。所选的氧化还原缓冲偶为 Nb2O5/NbO2。燃料的掺杂会影响其致密性和最终性能。因此，正在对这类燃料的致密化行为以及掺杂浓度的影响进行研究。将掺杂剂与二氧化铀混合，然后将粉末压制成颗粒，在还原气氛下烧结。在烧结过程中，对颗粒的线性收缩和氧气释放进行了监测。该方法强调了烧结过程中铌氧化物的还原，这导致了氧气的释放，从而影响了掺杂燃料的致密化行为和微观结构。

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Sintering behaviour of buffered UO2 fuel doped with niobium oxides

An innovative nuclear fuel doped with a redox buffer is being developed to control the partial oxygen pressure (pO₂) within the reactor and thereby limit stress corrosion cracking of the cladding. The selected redox buffer couple is Nb₂O₅/NbO₂. The doping of the fuel affects its densification and final properties. Therefore, a study is being conducted on the densification behavior of this type of fuel and the influence of dopant concentration. The dopant was mixed with UO₂, and the powder was then pressed into pellets, sintered under a reducing atmosphere. The linear shrinkage and oxygen release from the pellet were monitored during sintering. This method highlighted the reduction of niobium oxides during sintering, which causes oxygen release, influencing the densification behavior and microstructure of the doped fuel.

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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.