Impact of sintering parameters on the microstructure of homogeneous U1-xCexO2+δ ceramics

IF 3.8 3区材料科学 Q1 MATERIALS SCIENCE, CERAMICS Journal of the American Ceramic Society Pub Date : 2025-01-07 DOI:10.1111/jace.20376

Nicolas Clavier, Malvina Massonnet, Laurent Claparede, Renaud Podor, Paul-Henri Imbert, Julien Martinez, Nicolas Dacheux

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Abstract

The effects of atmosphere and cerium content on the densification and the final microstructure of homogeneous U_1-xCe_xO_2+δ solid solutions (x = 0.10; 0.25; 0.50) were investigated. Dilatometric studies first revealed that while the cerium content only slightly modifies sintering under an Ar/H₂ atmosphere, a change of the gas to argon dramatically modifies densification kinetics. As a result, samples prepared under Ar/H₂ exhibit a dense microstructure with micrometric grains. Conversely, samples sintered under argon appeared to be less densified but with larger grains. These changes were correlated with the variation of the final O/M stoichiometry (M = U+Ce) and illustrated by the construction of sintering maps. Finally, grain growth was found to be driven by grain boundary motion when the O/M ratio remained close to 2.00, while usual power laws did not apply for most hyper-stoichiometric samples. The first values of activation energy for the sintering of U_1-xCe_xO_2+δ solid solutions under an Ar/H₂ atmosphere were also determined.

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烧结参数对均匀U1-xCexO2+δ陶瓷微观结构的影响

气氛和铈含量对均匀U1-xCexO2+δ固溶体致密化和最终显微组织的影响(x = 0.10；0.25;0.50)。膨胀学研究首次揭示，在Ar/H2气氛下，铈含量仅轻微改变烧结，但气体变为氩气会显著改变致密化动力学。结果表明，在Ar/H2条件下制备的样品具有致密的微观结构和微米级晶粒。相反，在氩气下烧结的样品密度较小，但晶粒较大。这些变化与最终O/M化学计量（M = U+Ce）的变化相关，并通过烧结图的构建加以说明。最后，当O/M比保持在2.00附近时，晶粒的生长受到晶界运动的驱动，而通常的幂律并不适用于大多数高化学计量样品。同时测定了U1-xCexO2+δ固溶体在Ar/H2气氛下烧结的第一活化能。

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来源期刊

Journal of the American Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

7.50

自引率

7.70%

发文量

590

审稿时长

2.1 months

期刊介绍： The Journal of the American Ceramic Society contains records of original research that provide insight into or describe the science of ceramic and glass materials and composites based on ceramics and glasses. These papers include reports on discovery, characterization, and analysis of new inorganic, non-metallic materials; synthesis methods; phase relationships; processing approaches; microstructure-property relationships; and functionalities. Of great interest are works that support understanding founded on fundamental principles using experimental, theoretical, or computational methods or combinations of those approaches. All the published papers must be of enduring value and relevant to the science of ceramics and glasses or composites based on those materials. Papers on fundamental ceramic and glass science are welcome including those in the following areas: Enabling materials for grand challenges[...] Materials design, selection, synthesis and processing methods[...] Characterization of compositions, structures, defects, and properties along with new methods [...] Mechanisms, Theory, Modeling, and Simulation[...] JACerS accepts submissions of full-length Articles reporting original research, in-depth Feature Articles, Reviews of the state-of-the-art with compelling analysis, and Rapid Communications which are short papers with sufficient novelty or impact to justify swift publication.