Effects of water adsorption on tritium release behavior of Li4TiO4 and Li4TiO4-Li2TiO3 core-shell structure breeding ceramics

Chen, Ruichong; Katayama, Kazunari; Ipponsugi, Akito; Guo, Hao; Lu, Tiecheng; Feng, Wenjiang

doi:10.1016/j.fusengdes.2022.113374

Cited by 3 publications

(1 citation statement)

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“…An important role in accelerating degradation is played not only by accumulation effects but also by the type of radiation exposure and the phase composition of ceramics. Variation of the phase composition of ceramics by combining two phases or by the appearance of impurity inclusions in the form of simple oxide compounds in the composition of ceramics, as shown in a number of works [6][7][8], leads to a significant increase in resistance to external influences as well as increased resistance to degradation during operation. An essential role in this is also played by size effects, characterized by the fact that at small grain sizes, there is the formation of a large number of boundary effects, which in turn prevent the diffusion of nuclear reaction products in the structure, thereby preventing them from agglomerating in the cavities and pores of the structure [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Study of Gas Swelling Processes under Irradiation with Protons and He2+ Ions in Li4SiO4–Li2TiO3 Ceramics

Kenzhina,

Kozlovskiy,

Chikhray

et al. 2023

Crystals

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One of the important areas of research in the energy sector is the study of the prospects for using new types of nuclear fuel, including tritium, which is one of the most promising types of fuel for thermonuclear energy. At the same time, for the production of tritium in the required quantities, the one that is the most optimal is the use of blanket materials based on lithium-containing ceramics. This is where tritium is released from lithium under the influence of neutron irradiation. The paper presents the results of an investigation of the influence of two-phase ceramics based on Li4SiO4–Li2TiO3 compounds on the resistance to external influences (mechanical loads) during the accumulation of hydrogen and helium (He2+) in the near-surface layer. The interest in such studies is primarily related to the search for solutions in the field of creating high-strength materials for tritium generation for its further use as nuclear fuel for thermonuclear fusion, as well as to the study of the mechanisms of the influence of different phases on the changes in the strength properties of ceramics, which provides an opportunity to expand fundamental knowledge in this area. The proposed method of obtaining two-phase ceramics by mechanical-chemical mixing and subsequent sintering into spherical particles enables the production of well-structured, high-strength ceramics of specified geometric dimensions (limited only by the dimensions of the mold) with a controlled phase ratio. During the experiments, it was found that increasing the content of Li4SiO4 phase in ceramics leads to an increase in strength characteristics (hardness, resistance to cracking) by 15–20% compared to single-phase ceramics. The most optimal composition of two-phase ceramics with high resistance to destructive embrittlement is the ratio of phases 0.75Li4SiO4–0.25Li2TiO3. One of the factors explaining the increase in resistance to destructive embrittlement under high-dose irradiation for two-phase ceramics is the increased dislocation density and the presence of interphase or intergranular boundaries, the high concentration of which leads to the creation of additional obstacles to the agglomeration of hydrogen and helium in the near-surface layer.

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