Preparation of Li4TiO4-Li2TiO3 core-shell ceramic pebbles with thick shells and high strength through an improved granulation method

Chen, Ruichong; Liao, Zhijun; Shi, Yao; Wang, Hailiang; Guo, Hao; Zeng, Yuanyuan; Qi, Jianqi; Shi, Qiwu; Lu, Tiecheng

doi:10.1016/j.jnucmat.2020.152580

Cited by 14 publications

(17 citation statements)

References 31 publications

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“…The preparation process of Li 4 TiO 4 -Li 2 TiO 3 core-shell pebbles was a further optimization of the previously reported granulation method [20]. Firstly, Li 4 TiO 4 and Li 2 TiO 3 precursor powders were synthesized by solid-phase reaction.…”

Section: Materials Preparationmentioning

confidence: 99%

“…Moreover, it should be noted that Li 4 TiO 4 is not stable in the air and easily reacts with CO 2 and moisture [16][17][18]. Inspired by the above research and aimed at suppressing the instability of Li 4 TiO 4 , an advanced Li 4 TiO 4 -Li 2 TiO 3 core-shell ceramic pebble was proposed in the previous study [19,20]. In order to further increase the lithium density of the core-shell pebbles, it is necessary to further reduce the thickness of the Li 2 TiO 3 shell without affecting the mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

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Mass Transfer Behavior and Microstructure Evolution of Li4TiO4-Li2TiO3 Core-shell Breeding Ceramic Under Harsh Operating Conditions

Chen

Katayama

et al. 2021

Preprint

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The development of novel tritium breeding materials was urgently needed in order to continuously optimize the tritium breeding ratio (TBR) of thermonuclear fusion reactors. From this point of view, Li4TiO4-Li2TiO3 core-shell breeding materials with more reasonable structure and theoretical Li density of 0.464 g/cm3 were prepared in this work. Notably, the mass transfer experiment at 900 °C in 1% H2/Ar shows that the theoretical Li density of this core-shell material after heating for 30 days was significantly higher than that of other breeding materials, indicating that it can provide more stable and efficient TBR. Specifically, the Li mass loss of the sample after 30 days heating was 3.4%, resulting in a decrease of Li density to 0.415 g/cm3. The mechanism of Li mass loss in Li4TiO4-Li2TiO3 core-shell breeding materials was investigated in detail. Moreover, the samples did not crack or collapse during the long-term heating process, and always maintained a satisfactory crushing load, revealing that this core-shell breeding ceramic can be used for a long time under severe operating conditions.

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Section: Materials Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mass Transfer Behavior and Microstructure Evolution of Li4TiO4-Li2TiO3 Core-shell Breeding Ceramic Under Harsh Operating Conditions

Chen

Katayama

et al. 2021

Preprint

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“…At the same time, one of the key requirements for lithium-containing ceramics based on titanates and silicates is an increased resistance to mechanical and radiation damage in the case of their operation in the production of tritium [11][12][13][14][15]. To this end, in the past few years, various options for modification or doping have been proposed to increase stability and productivity, as well as to preserve the materials' structural and strength properties during production of tritium and its absorption and desorption [16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

The Synthesis, Properties, and Stability of Lithium-Containing Nanostructured Nickel-Doped Ceramics

Kozlovskiy

Zdorovets

Khametova

et al. 2022

Gels

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Lithium-containing ceramics have several great potential uses for tritium production, as well as its accumulation. However, their use is limited due to their poor resistance to external influences, mechanical pressure, and temperature changes. In this work, initial nanostructured ceramic powders were obtained using the sol-gel method, by mixing TiO2 and LiClO4·3H2O with the subsequent addition of NiO nanoparticles to the reaction mixture; these powders were subsequently subjected to thermal annealing at a temperature of 1000 °C for 10 h. Thermal annealing was used to initiate the phase transformation processes, and to remove structural distortions resulting from synthesis. During the study, it was found that the addition of NiO nanoparticles leads to the formation of solid solutions by a type of Li0.94Ni1.04Ti2.67O7 substitution, which leads to an increase in the crystallinity and structural ordering degree. At the same time, the grain sizes of the synthesized ceramics change their shape from rhomboid to spherical. During analysis of the strength characteristics, it was found that the formation of Li0.94Ni1.04Ti2.67O7 in the structure leads to an increase in hardness and crack resistance; this change is associated with dislocation. When analyzing changes in resistance to cracking, it was found that, during the formation of the Li0.94Ni1.04Ti2.67O7 phase in the structure and the subsequent displacement of the Li2TiO3 phase from the composition, the crack resistance increases by 15% and 37%, respectively, which indicates an increase in the resistance of ceramics to cracking and the formation of microcracks under external influences. This hardening and the reinforcing effect are associated with the replacement of lithium ions by nickel ions in the crystal lattice structure.

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“…In recent years, the biphasic Li 2 TiO 3 -Li 4 SiO 4 breeding material has been fabricated to combine the advantages of Li 4 SiO 4 and Li 2 TiO 3 [4][5][6]. This biphasic ceramic material offers promising opportunities for achieving balanced tritium release characteristics and improved mechanical properties [7].…”

Section: Introductionmentioning

confidence: 99%

“…Li-based ceramic materials are exposed to fusion neutrons in the fusion reactor blanket, where nuclear reactions of 6 Li(n,)T or 7 Li(n,n)T lead to the production of tritium. According to estimates that account for nuclear heating, the temperature distribution of the solid breeding material in Test Blanket Modules (TBM) ranges between 573 and 1173 K [8].…”

Section: Introductionmentioning

confidence: 99%

EION-IMPLANTED DEUTERIUM RELEASE BEHAVIOR FROM Li-BASED ADVANCED CERAMICS

Tolstolutskaya¹,

Karpov²,

Ruzhytskiy³

et al. 2022

Problems of Atomic Science and Technology

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The behavior of ion-implanted deuterium in advanced lithium orthosilicate (Li4SiO4) pellets with addition of lithium metatitanate (Li2TiO3), and in reference Li4SiO4 pellets, has been studied. Thermal desorption spectroscopy (TDS) was used to examine the deuterium interaction with radiation defects in materials. Deuterium gas release from studied ceramics has revealed a clear dependence of deuterium trapping behavior on phase composition. The trap strength of radiation defects formed in lithium titanate was found to be higher than in lithium orthosilicate.

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Preparation of Li4TiO4-Li2TiO3 core-shell ceramic pebbles with thick shells and high strength through an improved granulation method

Cited by 14 publications

References 31 publications

Mass Transfer Behavior and Microstructure Evolution of Li4TiO4-Li2TiO3 Core-shell Breeding Ceramic Under Harsh Operating Conditions

Mass Transfer Behavior and Microstructure Evolution of Li4TiO4-Li2TiO3 Core-shell Breeding Ceramic Under Harsh Operating Conditions

The Synthesis, Properties, and Stability of Lithium-Containing Nanostructured Nickel-Doped Ceramics

EION-IMPLANTED DEUTERIUM RELEASE BEHAVIOR FROM Li-BASED ADVANCED CERAMICS

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