A process for fabrication of Li2TiO3 ceramic pebbles with high mechanical properties via non-hydrolytic sol-gel method

Tan, Guangfan; Hu, Xin; Wang, Shiyuan; Yang, Xiu‐Wei; Li, Yusha; Yang, Zhi; Zhang, Yingchun

doi:10.1016/j.ceramint.2020.07.266

Cited by 19 publications

(14 citation statements)

References 44 publications

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“…29‐0829), and Li 2 CO 3 (JCPDS Card No. 22‐1141) phases at room temperature 36,37 . But when the heating temperature increased to 750°C, the diffraction peaks of the Li 2 SiO 3 and Li 2 CO 3 phases disappeared.…”

Section: Resultsmentioning

confidence: 99%

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

Tan

Cai

et al. 2023

J Am Ceram Soc.

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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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Section: Resultsmentioning

confidence: 99%

“…22-1141) phases at room temperature. 36,37 But when the heating temperature increased to 750 • C, the diffraction peaks of the Li 2 SiO 3 and Li 2 CO 3 phases disappeared. All of the diffraction peaks appeared in the curve contain only Li 2 TiO 3 and Li 4 SiO 4 (JCPDS Card No.…”

Section: Phase and Micromorphology Of LI 2 Tio 3 -Li 4 Sio 4 Powdermentioning

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.

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“…The sharp band at ∼950 cm –1 is due to the Ti=O stretching mode . The peak at 1378 cm –1 represents Li–O–Ti vibrations . The presence of the characteristic IR bands in the spectral range of 1300–1700 cm –1 indicates that the surface of LT contains hydroxyl groups and molecularly adsorbed O 2 , CO 2 , and CO molecules, which could come from the air .…”

Section: Resultsmentioning

confidence: 99%

“…36 The peak at 1378 cm −1 represents Li−O−Ti vibrations. 37 The presence of the characteristic IR bands in the spectral range of 1300−1700 cm −1 indicates that the surface of LT contains hydroxyl groups and molecularly adsorbed O 2 , CO 2 , and CO molecules, which could come from the air. 38 The IR band at 2350 cm −1 is assigned to Ti−O vibrations.…”

Section: Resultsmentioning

confidence: 99%

Ethylenediaminetetraacetic Acid (EDTA) Assisted Single Step Densification of Li₂TiO₃/PTFE Composites at Ultralow Sintering Temperature to Realize a High-Performance Ku-Band Antenna

Narayanaiyer

Mohanan

Nazeemabeevi

et al. 2022

ACS Appl. Electron. Mater.

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In the last few decades, extensive research has been focused on the ever-increasing demand for energy-efficient materials and technologies in consumer electronics. The low-weight, low-cost, environmentally safe Li-based ceramics are widely investigated as potential materials for Li-ion batteries and low-temperature cofired ceramics (LTCC). In the present work, we combine high volume fractions of Li2TiO3 (LT) ceramic with incredibly versatile polytetrafluoroethylene (PTFE) to synthesize thermally stable, low-loss dielectrics at ultralow temperatures (<150 °C) in a single step without any additional transient liquid phase in a very short time, and the effect of different wt % of ethylenediaminetetraacetic acid (EDTA), which is a chelating agent, on the densification, microstructure, thermal, and broadband dielectric properties of these composites has been studied. X-ray photoelectron and FTIR spectroscopic analyses were used to explain the densification mechanism in these composites. The presence of the OH– ion on the surface of LT and manipulation of the ceramic-polymer interphase by EDTA are significant in the densification of LT-PTFE composites. A cylindrical prototype dielectric resonator antenna (CDRA) was designed, simulated, and fabricated with the 0.7LT-0.3PTFE-5EDTA composite having excellent thermal and dielectric properties, and antenna properties were experimentally verified. The return loss, input impedance, and radiation pattern of the CDRA were examined, and the experimental results match reasonably well with simulated results. This study shows that the 0.7LT-0.3PTFE-5EDTA composite is a potential candidate for the fabrication of an economical, low-loss, lightweight, easy-to-fabricate, wide bandwidth CDRA for telecommunication applications in the Ku-band. Further, it is possible to achieve enhanced bandwidth and gain, by varying the compositions of these composites.

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“…Most current experiments are working on the preparation and its effect on the tritium release performance. Tan et al employed a non-hydrolytic sol–gel method to obtain Li 2 TiO 3 ceramic particles with a grain size of 2.85 μm and porosity of 19.84%, 10 which is beneficial to the tritium release process. Guo et al implemented the rolling method sintered in air and vacuum 11 and found that ceramic pebbles sintered in air have lower porosity and higher Li content than those sintered in vacuum, which resulted in a higher tritium release rate of the pebbles.…”

Section: Introductionmentioning

confidence: 99%

Trapping Hydrogen Atoms in Vacancies of Li₂TiO₃ Crystal: A First-Principles Study

Wang

et al. 2022

ACS Omega

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The hydrogen atom capacity in the vacancies of the Li 2 TiO 3 crystal is systematically studied by the first-principles method to evaluate its tritium release performance as a solid breeder material in nuclear fusion reactors. The adsorption process of adding hydrogen atoms one by one in the vacancy are investigated to find the possible adsorption sites of the hydrogen atoms in the vacancy. The charge transfer and density of states analysis are performed to reveal the form of a hydrogen–hydrogen dimer in the vacancy. Also, the trapping energy and formation energy are defined and calculated to determine the hydrogen atom capacity of the system. According to the simulations, the Ti vacancies have the strongest hydrogen atom capacity followed by Li vacancies, and O vacancies are the weakest. The influence of hydrostatic pressure on the hydrogen atom capacity is also investigated. Our results reveal the hydrogen capacity of vacancies in the Li 2 TiO 3 crystal from the atomic scale, which also provide a theoretical guide to the related tritium release experiments.

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A process for fabrication of Li2TiO3 ceramic pebbles with high mechanical properties via non-hydrolytic sol-gel method

Cited by 19 publications

References 44 publications

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

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

Ethylenediaminetetraacetic Acid (EDTA) Assisted Single Step Densification of Li₂TiO₃/PTFE Composites at Ultralow Sintering Temperature to Realize a High-Performance Ku-Band Antenna

Trapping Hydrogen Atoms in Vacancies of Li₂TiO₃ Crystal: A First-Principles Study

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A process for fabrication of Li2TiO3 ceramic pebbles with high mechanical properties via non-hydrolytic sol-gel method

Cited by 19 publications

References 44 publications

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

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

Ethylenediaminetetraacetic Acid (EDTA) Assisted Single Step Densification of Li2TiO3/PTFE Composites at Ultralow Sintering Temperature to Realize a High-Performance Ku-Band Antenna

Trapping Hydrogen Atoms in Vacancies of Li2TiO3 Crystal: A First-Principles Study

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

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

Ethylenediaminetetraacetic Acid (EDTA) Assisted Single Step Densification of Li₂TiO₃/PTFE Composites at Ultralow Sintering Temperature to Realize a High-Performance Ku-Band Antenna

Trapping Hydrogen Atoms in Vacancies of Li₂TiO₃ Crystal: A First-Principles Study