Efficient fabrication of high strength Li2TiO3 ceramic pebbles via improved rolling ball method assisted by sesbania gum binder

Tan, Guangfan; Song, Shenhua; Hu, Xin; Cai, Liang; Li, Yusha; Zhang, Yingchun

doi:10.1016/j.ceramint.2021.06.111

Cited by 17 publications

(13 citation statements)

References 26 publications

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“…prepared Li 2 TiO 3 breeder materials using polyvinyl alcohol (PVA) and polyvinyl pyrrolidone by the rolling method. The Li 2 TiO 3 ceramic breeder pebbles sintered at 900°C have a sphericity of 1.08 and a crushing load of 21 N. The weak strength is mainly due to the introduction of a large amount of organic matter and the low packing density of powder particles in the granulation process 20 …”

Section: Introductionmentioning

confidence: 99%

“…The Li 2 TiO 3 ceramic breeder pebbles sintered at 900 • C have a sphericity of 1.08 and a crushing load of 21 N. The weak strength is mainly due to the introduction of a large amount of organic matter and the low packing density of powder particles in the granulation process. 20 Melt spraying is the most mature technique for the mass production of tritium-breeding ceramic pebbles. 21 For melt spraying, ceramic raw materials are heated to melt; the molten ceramic liquid is then sprayed out from a nozzle with airflow to generate spherical droplets under the surface tension during the falling process.…”

Section: Introductionmentioning

confidence: 99%

“…12,13 Extensive efforts have been devoted to developing universal and efficient methods for the preparation of size-controllable tritium breeder pebbles. The mainstream methods for breeder ceramic pebble preparation can be classified into extrusion-spheronizationsintering, [14][15][16][17] rolling method, [18][19][20] melt spraying, [21][22][23][24] and wet process. [25][26][27] In the extrusion-spheronizationsintering process, the conventional method is to extrude rod-like semi-solid billets consisting of organic binder and ceramic powder from the extrusion equipment and then granulate it with a spheronizer under the action of friction.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Preparation of tritium breeding Li₂TiO₃ ceramic pebbles via newly developed piezoelectric micro‐droplet jetting

Cai

Lü

et al. 2022

J Am Ceram Soc.

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Wet methods as an emerging technique for the preparation of millimeter‐sized tritium breeding ceramic pebbles, but the imposed air pressure as the driving forces to extrude slurry droplets are fluctuating during the reciprocating extrusion process, which caused a slight inconsistency in pebble sizes. In this study, a piezoelectric micro‐droplet jetting approach was proposed by introducing a piezo‐driven valve and modifying the slurry barrel mechanism to realize the air pressure invariable. A self‐developed piezoelectric micro‐droplet jetting device was successfully utilized to prepare Li2TiO3 green pebbles with coefficients of variation being lower than 2.7%. The size of the green pebbles could be precisely controlled in the range of 0.88–1.37 mm by manipulating the nozzle diameter, the air pressure, and the jetting time. The pebbles sintered at 1000°C for 3 h possessed a small grain size of ∼5.9 μm, a satisfied relative density of ∼84.8% T.D., and a high crush load of ∼25.7 N, implying the prepared pebbles could be used as a promising solid tritium breeding material in fusion reactors. These findings are anticipated to provide new opportunities for the highly efficient preparation of size‐controllable tritium breeding ceramic pebbles.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Preparation of tritium breeding Li₂TiO₃ ceramic pebbles via newly developed piezoelectric micro‐droplet jetting

Cai

Lü

et al. 2022

J Am Ceram Soc.

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“…The detailed centrifugal granulation process was described in the previous report. 33 First, the spray-drying process was employed to fabricate spherical Li 2 TiO 3 powder, and the spherical powder was put into the spherical pot body, and the green pebbles with an average diameter of 0.5 mm were prepared by the centrifugal granulation method under the action of centrifugal force and binder. Second, the ethylene glycol solution was uniformly sprayed on the surface of the Li 2 TiO 3 green pebbles under the rolling process, and the Li 2 TiO 3 -Li 4 SiO 4 green pebbles with the desired size can be obtained by steadily adding the pre-Li 4 SiO 4 2 explains the fabricating process of Li 2 TiO 3 -Li 4 SiO 4 ceramic pebbles via the centrifugal granulation method.…”

Section: Fabrication Of LI 2 Tio 3 -Li 4 Sio 4 Ceramic Pebblesmentioning

confidence: 99%

Mass fabrication of Li₂TiO₃–Li₄SiO₄ ceramic pebbles with high strength by facile centrifugal granulation method

Tan

Cai

et al. 2023

J Am Ceram Soc.

Self Cite

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The bi‐phase Li2TiO3–Li4SiO4 ceramic pebbles have been considered a promising breeder to realize the tritium self‐sustainment in the blanket. However, up to now, the reported ceramic pebbles have the disadvantages of low yield, poor crushing load, and loose internal structure, which cannot meet the practical application requirements. In this work, the Li2TiO3–Li4SiO4 ceramic pebbles with excellent mechanical properties were fabricated successfully via the centrifugal granulation method with the assistance of introducing a spray‐drying process, simulating particle trajectory by discrete element software and improving bonding interface between core and shell with ethylene glycol. The composition, microstructure, and inner structure of the Li2TiO3–Li4SiO4 ceramic pebbles were investigated, respectively, through X‐ray diffraction, scanning electron microscopy, transmission electron microscopy, and X‐ray computed tomography (CT). It can be found that the employment of the ethylene glycol solution on the surface of Li2TiO3 can make the core and the shell combine well. Moreover, the effect of the rolling speed of the Li2TiO3–Li4SiO4 ceramic pebbles was investigated via discrete element method (EDEM) simulation and experiments. The experimental results displayed that the Li2TiO3–Li4SiO4 ceramic pebbles sintered at 1100°C for 2 h have a uniform diameter of 1 mm, a good sphericity of 0.97, and an excellent crushing load of 82.4 N, which are superior to those pebbles that obtained by using the traditional wet methods. Moreover, the CT results showed that the appropriate porosity of the core was 3.21% and of the shell was 10.73%. Therefore, the simple centrifugal granulation method can be applied to prepare the Li2TiO3–Li4SiO4 ceramic pebbles in a large scale and shed a light to investigate the relevant advanced biphasic tritium breeder materials in the future.

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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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Efficient fabrication of high strength Li2TiO3 ceramic pebbles via improved rolling ball method assisted by sesbania gum binder

Cited by 17 publications

References 26 publications

Preparation of tritium breeding Li₂TiO₃ ceramic pebbles via newly developed piezoelectric micro‐droplet jetting

Preparation of tritium breeding Li₂TiO₃ ceramic pebbles via newly developed piezoelectric micro‐droplet jetting

Mass fabrication of Li₂TiO₃–Li₄SiO₄ ceramic pebbles with high strength by facile centrifugal granulation method

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

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Efficient fabrication of high strength Li2TiO3 ceramic pebbles via improved rolling ball method assisted by sesbania gum binder

Cited by 17 publications

References 26 publications

Preparation of tritium breeding Li2TiO3 ceramic pebbles via newly developed piezoelectric micro‐droplet jetting

Preparation of tritium breeding Li2TiO3 ceramic pebbles via newly developed piezoelectric micro‐droplet jetting

Mass fabrication of Li2TiO3–Li4SiO4 ceramic pebbles with high strength by facile centrifugal granulation method

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

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Product

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About

Preparation of tritium breeding Li₂TiO₃ ceramic pebbles via newly developed piezoelectric micro‐droplet jetting

Preparation of tritium breeding Li₂TiO₃ ceramic pebbles via newly developed piezoelectric micro‐droplet jetting

Mass fabrication of Li₂TiO₃–Li₄SiO₄ ceramic pebbles with high strength by facile centrifugal granulation method