A novel preparation of porous Li2TiO3 pebbles with a distinctive structure

IF 2.8 2区工程技术 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Nuclear Materials Pub Date : 2024-09-25 DOI:10.1016/j.jnucmat.2024.155424

Yichao Gong , Zhaokun Li , Junjie Li , Jianqi Qi , Longchao Zhuo , Guojun Zhang , Tiecheng Lu

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Abstract

Optimization of the pore structure stands out as an effective approach for bolstering the tritium release performance of lithium-based tritium breeding ceramics, particularly when employing a high open porosity configuration. In this study, Li₂TiO₃ fibers were synthesized via the hydrothermal method, with the assistance of TiO₂-B nanowires acting as templates. Subsequently, porous Li₂TiO₃ pebbles with varying microstructures were fabricated through a combination of the wet method and a sintering process. Sintering process plays a crucial role in determining the microscopic morphology. An increase in temperature resulted in a suppression of the growth of fibrous grains and the transformation of fibrous grains into quasi-spherical grains. Moreover, a two-step sintering process was proposed as a means of improving the crush load (15.9 N vs. 22.0 N) of Li₂TiO₃ pebbles while simultaneously preserving their high porosity (24.91%). The Li₂TiO₃ pebbles, produced by the two-step sintering process, exhibited a distinctive micromorphology characterized by interconnected particles forming short rod-shaped microstructures. This distinctive micromorphology contributes to the maintenance of a high degree of open porosity (10.52%).

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具有独特结构的多孔 Li2TiO3 卵石的新型制备方法

优化孔隙结构是提高锂基氚孕育陶瓷氚释放性能的有效方法，尤其是在采用高开放孔隙率结构时。本研究以 TiO2-B 纳米线为模板，通过水热法合成了 Li2TiO3 纤维。随后，结合湿法和烧结工艺，制备出了具有不同微观结构的多孔 Li2TiO3 卵石。烧结过程在决定微观形态方面起着至关重要的作用。温度升高会抑制纤维状晶粒的生长，并使纤维状晶粒转变为准球形晶粒。此外，还提出了一种两步烧结工艺，以提高氧化钛锂鹅卵石的压碎载荷（15.9 牛顿对 22.0 牛顿），同时保持其较高的孔隙率（24.91%）。通过两步烧结工艺制作的 Li2TiO3 卵石呈现出独特的微观形态，其特征是相互连接的颗粒形成了短棒状的微观结构。这种独特的微观形态有助于保持较高的开放孔隙率（10.52%）。

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 Nuclear Materials 工程技术-材料科学：综合

CiteScore

5.70

自引率

25.80%

发文量

601

审稿时长

63 days

期刊介绍： The Journal of Nuclear Materials publishes high quality papers in materials research for nuclear applications, primarily fission reactors, fusion reactors, and similar environments including radiation areas of charged particle accelerators. Both original research and critical review papers covering experimental, theoretical, and computational aspects of either fundamental or applied nature are welcome. The breadth of the field is such that a wide range of processes and properties in the field of materials science and engineering is of interest to the readership, spanning atom-scale processes, microstructures, thermodynamics, mechanical properties, physical properties, and corrosion, for example. Topics covered by JNM Fission reactor materials, including fuels, cladding, core structures, pressure vessels, coolant interactions with materials, moderator and control components, fission product behavior. Materials aspects of the entire fuel cycle. Materials aspects of the actinides and their compounds. Performance of nuclear waste materials; materials aspects of the immobilization of wastes. Fusion reactor materials, including first walls, blankets, insulators and magnets. Neutron and charged particle radiation effects in materials, including defects, transmutations, microstructures, phase changes and macroscopic properties. Interaction of plasmas, ion beams, electron beams and electromagnetic radiation with materials relevant to nuclear systems.