Study on the structure of Li2TiO3-Li4SiO4 tritium breeder and its performance under thermal cycle loading with compression pressure

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

Journal of Nuclear Materials Pub Date : 2025-03-13 DOI:10.1016/j.jnucmat.2025.155726

Anjie Yang, Yifu Xu, Kaixuan Zhu, Qilai Zhou

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引用次数: 0

Abstract

Li₂TiO₃-xLi₄SiO₄ (x = 0.5, 1, 2) pebbles were fabricated to investigate the mechanisms of microstructure variation for the ceramic with different phase ratios. The structure stability of the pebbles under simulated working conditions in fusion reactors was examined. The crush load of Li₂TiO₃-xLi₄SiO₄ (x = 2) pebbles reached 129.6 N. The ceramic with this phase ratio has a higher activation energy (E_a) for grain growth at high temperatures, which suppresses excessive grain growth. The synergetic effects of high temperature, thermal cycle loading, and compression pressure on the structure stability of pebbles were investigated. There was no significant change in the structure and mechanical properties of the pebbles after heating at a constant temperature under compression pressure. However, the strength of the pebbles deteriorated rapidly when exposed to thermal cycle loading with compression pressure. These results suggested that the simultaneous exposure to compression pressure and thermal cycle loading would accelerate the deterioration of the ceramic structure, which should attract more attention from the viewpoint of applying the pebbles in fusion reactors.

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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.