Materials
·
2023
·Vol. 16
·期 4
·1544
·
IF 3.4
Angxuan Wu,Yuchen Zhu,Chen Xu,Nianping Yan,Xuetong Zhao,Xilin Wang,Zhidong Jia
Arc floating in surface flashover can be controlled by reducing the interfacial charge-transfer resistance of ceramics. However, thus far, only a few studies have been conducted on methods of treating ceramic surfaces directly to reduce the interfacial charge-transfer resistance. Herein, we explore the flash sintering behavior of a ceramic surface (3 mol% yttria-stabilized zirconia (3YSZ)) onto which loose metal (iron) powder was spread prior to flash sintering at room temperature (25 °C). The iron powder acts as a conductive phase that accelerates the start of flash sintering while also doping the ceramic phase during the sintering process. Notably, the iron powder substantially reduces the transition time from the arc stage to the flash stage from 13.50 to 8.22 s. The surface temperature (~1600 °C) of the ceramic substrate is sufficiently high to melt the iron powder. The molten metal then reacts with the ceramic surface, causing iron ions to substitute Zr4+ions and promoting rapid densification. The YSZ grains in the metal-infiltrated area grow exceptionally fast. The results demonstrate that spreading metal powder onto a ceramic surface prior to flash sintering can enable the metal to enter the ceramic pores, which will be of significance in developing and enhancing ceramic–metal powder processing techniques.Keywords:flash sintering;room temperature;YSZ;metal powders;arc
研究领域:
材料科学
·
陶瓷加工
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·
IF 6.2
Ming Li,Lili Guan,Yunshuo Zhu,Yanrui Shi,Yarong Huang,Xiwen Song
The phase formation and densification of LaCrO 3 were successfully achieved through AC reactive flash sintering (AC-RFS) in one step at a constant temperature of 600°C, using La 2 O 3 and Cr 2 O 3 as raw materials. The current density curve ‘buffer region’ was discovered under different electric field strengths. The ‘buffer region’ corresponds to the phase transformation from the intermediate phase La 2 CrO 6 to the target product LaCrO 3 . Joule heating and a high heating rate resulted in nearly full densification of the LaCrO 3 ceramic central region sintered for 1 second at maximum current density. In particular, the behavior of LaCrO 3 was analyzed, and the phase transformation completion point was evaluated based on the RFS behavior without the need for complex testing methods. The discovery of the ‘buffer region’ provides experimental guidance for determining the phase transformation completion points of various other materials in RFS experiments.
研究领域:
材料科学
·
陶瓷学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Yan Ziyang,Wu Angxuan,Wang Xilin,Huang Rongxia,Yan Nianping,Jia Zhidong,Wang Liming
In this paper, ZnO was used as a sintering aid as well as reactant in the reactive flash sintering (RFS) of zinc-containing ceramic materials at room temperature (25 °C). The RFS of ZnO-based ceramics, both ZnAl 2 O 4 and Zn 2 TiO 4 , were achieved with the application of a high electric field. Contrary to previous reports, the RFS of ZnAl 2 O 4 was divided into two stages according to temperature changes, and the effect of the reaction exotherm on the RFS was presented for the first time in this paper. In addition, the RFS produced a larger grain size of ZnAl 2 O 4 than conventional sintering did.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Zaizhi Yang,Xi Wang,Liang Zhang,Hailin Li,Hui Zhang,Dong Xu
(Ca, Ta) co-doped TiO 2 ceramics were successfully prepared using flash sintering technology, and the effects of oxygen vacancies on the rapid densification and giant dielectric properties were studied. The results suggest that the maximum volume fraction of oxygen vacancies in flash-sintered samples is approximately 10%. Oxygen vacancies decrease the barrier energy level of atomic diffusion and provide convenient diffusion channels, resulting in rapid densification of the sample within 24 min at 1100 °C. All flash-sintered samples exhibit high relative density, exceeding 95%. Oxygen vacancies promote the electron-pinning defect dipole effect at low temperatures. As the temperature increases, carriers such as oxygen vacancies move to the grain boundary, forming an internal barrier layer capacitance effect. The optical dielectric constant reaches 7.25 × 10 4 , and the dielectric loss drops to 0.09. Oxygen vacancy play an important role in both flash sintering technology and the giant dielectric properties of co-doped TiO 2 ceramics.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
SCRIPTA MATERIALIA
·
2020
·
IF 5.079
Ke Ren,Sisi Huang,Yejie Cao,Gang Shao,Yiguang Wang
Herein, we report the densification behavior of a typical electric ceramic, barium titanate (BaTiO 3 ), and highlight the role of oxygen vacancies in rapid densification of BaTiO 3 during flash sintering. The activation energies of flash- and conventional-densification processes are compared to reveal that the initiation of flash sintering is triggered by the accumulation of generated oxygen vacancies under the electric field. Furthermore, the densification kinetics of BaTiO 3 and X-ray photoelectron spectroscopy of flash-sintered BaTiO 3 infer that the ultrafast densification during the flash-sintering stage is dominated by the migration of electric field-generated defects coupled with defect-annihilation by take-in oxygen from the environment.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
DOI
高影响因子
SCRIPTA MATERIALIA
·
2019
·
IF 4.539
Baisheng Ma,Yan Zhu,Kewei Wang,Zhenzhong Sun,Dianguang Liu,Gang Shao,Jinling Liu,Yiguang Wang
Flash sintering method was adopted to sinter SiO 2 -coated BaTiO 3 ceramics to lower sintering temperature and shorten sintering time. The microstructure and dielectric property of BaTiO 3 with different amount of SiO 2 coating were studied. Samples can be flash sintered at furnace temperatures lower than conventional sintering temperature. Though the onset flash sintering temperature increased obviously with increasing SiO 2 content, the estimated sample temperatures were found close to each other. Samples with improved density was achieved with higher SiO 2 content, but their dielectric constant decreased. Flash sintered samples with 1.5 wt% SiO 2 addition possess a fair dielectric constant with improved density.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Baisheng Ma,Jincheng Li,Yan Zhu,Kewei Wang,Boyan Sun,Ke Ren
In this paper, the reactive flash sintering method was adopted to synthesize a series of Li x (CoCrFeMnNi)O y oxides with x in the range of 0–1. The phase compositions and electrical conductivities of the oxides at different Li incorporation level were characterized. A single phase of spinel structure ( Fd-3m ) was obtained for the sample (CoCrFeMnNi) 3 O 4 . With incorporation of Li, the phase transformed into Rock-salt structure ( Fm-3m ) and then layered structure ( R-3m ). The ionic and electronic conductivities of the samples were characterized by impedance spectrometry. The ionic and electronic conductivities of the samples decreased with increasing Li incorporation level at first along with the spinel to Rock-salt structure transformation, and then increased with further increasing Li incorporation level along with the Rock-salt to layered structure transformation.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
IONICS
·
2025
·
IF 2.6
Yang Yue,Zhang Zheng,Ma Tianhui,Jia Shaoting,Huang Chao
To achieve high density and high Li-ion conductivity in the garnet LLZO (Li 7 La 3 Zr 2 O 12 ), an effective strategy is to dope it with high-valence elements to stabilize the cubic phase and to lower the sintering temperature. As well known, flash sintering (FS) is characterized by short sintering times and low furnace temperature. Herein, the doping modification of Ta-LLZO by flash sintering at 700 °C for the higher conductivity of LLZO was investigated in the present study. The results indicate that the addition of an appropriate amount of Ta 5+ can enhance the ionic conductivity. The relative density of the sintered cubic Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 is 94.72%, with a corresponding total ion conductivity of 9.8 × 10 –4 S cm −1 , demonstrating good electrical performance. A solid-state lithium metal battery with Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 electrolyte was assembled, and its electrical performance was tested at 50 °C. The results showed that an initial discharge specific capacity of 126.5 mAh g −1 at a 0.1C rate could be reached.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2021
·Vol. 105
·期 1
·419-427
·
IF 3.784
Fangming Liu,Bin Bai,Liang Cheng,Chen Xu
In this work spinel Li 4 Ti 5 O 12 (LTO) was successfully synthesized via flash sintering technique at a furnace temperature of 580°C within only 5 min for the first time. Phase evolution, microstructures, and electrochemical properties were investigated and compared with conventionally synthesized LTO. The flash sintered LTO shows good crystallinity, high purity, and small particle size. More importantly, it suggests that the flash sintering process could help inhibit lithium volatilization and control the particle size, which is vital to the improvement of the lithium-ion diffusion process and battery performance. Compared with the conventionally synthesized samples, the flash sintered LTO exhibits higher specific capacities, better cycling stabilities, and rate capabilities. Therefore, flash sintering shows potentials in improving the electrochemical performance of anode materials, and thus suggests an efficient strategy for rapid synthesis of high-performance anode materials for lithium-ion batteries.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Kewei Wang,Baisheng Ma,Tao Li,Chunxiao Xie,Zhenzhong Sun,Dianguang Liu,Jinling Liu,Linan An
In this study, powder mixtures at atomic ratios suitable for formation of Sr(Ti 0.2 Y 0.2 Zr 0.2 Sn 0.2 Hf 0.2 )O 3-x were flash sintered at 1000 °C and 40 mA/mm 2 . X-ray diffraction and energy-dispersive spectroscopy analyses revealed the formation of single-phase oxides after sintering for 1 min. This rapid formation of single-phase oxide was attributed to flash sintering characteristics, which not only enhanced the diffusion rate, but also softened the lattice. Compared to conventional heat treatment sintering, the sintering time was shortened to 1 min from 10 h, while the sample temperature was reduced to 1314 from 1500 °C. Therefore, flash sintering is a promising technique for rapid synthesis of high-entropy oxides.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2023
·Vol. 106
·期 10
·6074-6084
·
IF 3.9
Yunjie Gou,Guangdong Li,Wang Sun,Jinshuo Qiao,Kening Sun,Zhenhua Wang
LiCoO 2 (LCO) has been widely adopted as the electrode for lithium-ion batteries (LIBs) which provide a solution for settling problems referring to energy and environment. The demand for rapid and controllable synthesis of LCO increases dramatically. In this work, reactive flash sintering (RFS), for the first time, was introduced to synthesize LCO rapidly and controllably based on simple oxide precursors. The as-prepared LCO, investigated by physicochemical property characterization, showed well-constructed and high crystallinity and controllable morphologies, in which the grain size varied with the magnitude of the applied limited current value, allowing for grain size modulation. Furthermore, the as-prepared LCO exhibited excellent performance in cyclic stability and rate capacity by contrast with that synthesized by the conventional solid-phase sintering method. This is admittedly attributed to better crystallinity and less lithium loss. Therefore, RFS provides a new approach for the manufacture of LCO electrode and has the potential to be applied to other electrode materials for LIBs.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 11
·1-12
·
IF 2.8
Yang Zaizhi,Wang Xi,Zhang Liang,Li Hailing,Zhang Hui,Xu Dong
Flash sintering is considered a promising energy-saving and efficient technology for preparing high-temperature ceramics. The effects of limited current on flash sintering parameters, microstructure, and electrical properties of (La 1/2 , Ta 1/2 ) 0.02 Ti 0.98 O 2 ceramic were investigated by the XRD, SEM, XPS, and precision impedance analyzer. With limiting current increase, the grain size of flash sintering sample increases gradually, and the relative density increases first and then decreases. The average grain size is about 1 μm, and the highest relative density is 96.9%. Joule heating runaway and oxygen vacancy defect lead to rapid densification of flash sintering La and Ta co-doped TiO 2 ceramics. According to the EPDD model, doped La 3+ and Ta 5+ ions increase the concentration of oxygen vacancies and free electrons, lead to local polarization of carriers, and obtain a giant dielectric constant of ε ’ = 7.6 × 10 4 and low dielectric loss of tanδ = 0.11. At high temperature, electrons break free from the constraints of defect clusters and accumulate at the interface, leading to interface polarization due to the IBLC model. The giant dielectric properties originate from the combined effect of EPDD and IBLC model.
研究领域:
材料科学
·
陶瓷工程
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）