JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
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2022
·Vol. 106
·期 2
·444-454
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IF 2.606
Zhang Ji,Mu Chengfa,Shen Tao,Qi Gengxin
Different micro-structured SnO 2 powders were synthesized by hydrothermal and chemical co-precipitation methods. The influence of milling process and sintering parameters on the physical properties of Ag/SnO 2 electrical contact materials was investigated. The microstructure and physical properties of Ag/SnO 2 electrical contact materials were characterized by X-ray Diffraction, Scanning Electron Microscopy and Conductivity analyzer. The results showed that spherical SnO 2 (s) powders with a diameter about 2 μm were synthesized. With increased milling time, there was a slight decrease in the average sizes of Ag/SnO 2 (s) powders, but no significant difference. The optimal density of 9.545 g∙cm −3 and resistivity of 2.67 μΩ∙cm of Ag/SnO 2 (s) electrical contact materials were obtained after sintering at 860 °C for 6 h in air atmosphere. The promotion of sintering densification and improvement of physical properties of Ag/SnO 2 (s) contact may be due to the combined effects of mechanical activation energy and higher sintering temperature. Using the finite element method, simulation models were developed to interpret the effects of different micro-structured SnO 2 powders on the physical properties of Ag/SnO 2 materials.
Graphical abstract
研究领域:
材料科学
·
电气工程
✓ 已验证
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2024
·
IF 6.2
Taehyeob Im,Kwiyoung Lee,Jonghyeok Ahn,Minjong Kim,Dongsup Lee,Jai-Sung Lee,Jongryoul Kim,Caroline Sunyong Lee
Fe-4.5Si-based soft magnetic composite (SMC) cores suitable for high-frequency applications were studied using ball milling and furnace sintering. Through ball milling, Fe-4.5Si powder was coated with Mg(OH) 2 nanoparticles to form a uniform insulation layer, introducing a novel method to optimize the furnace sintering process by adding H 3 BO 3 and SiO 2 to the insulation layer. Mg(OH) 2 nanoparticles effectively coated on Fe-4.5Si powder through ball milling formed MgO and Mg 2 SiO 4 double insulation layers after heat treatment, which provided stable insulation layer and minimized core loss in high-frequency regions up to 1 MHz. Furthermore, applying a 7% MgO–B 2 O 3 –SiO 2 insulation for sintering at 1100 °C resulted in an increase in permeability to 68, starting from its initial value of 28 at 100 kHz, while porosity decreased from 18.1% to 9.3%, minimizing the degradation of the insulation layer. After sintering, phase analysis of the MgO–B 2 O 3 –SiO 2 insulation revealed the presence of Mg 2 B 2 O 5 , MgSiO 3 , and a liquid phase, indicating densification of the cores owing to the diffusion reaction and liquid phase sintering among MgO–B 2 O 3 –SiO 2 . Therefore, the ball-milling and furnace sintering processes shown in this study provide an effective solution for increasing density of Fe-4.5Si powder-based SMC cores to develop magnetic cores suitable for high-frequency applications.
研究领域:
材料科学
·
电气工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 27
·21713-21726
·
IF 2.779
Zeng Jinling,Xu Yiwen,Li Liangjie,Wang Wenwei,Yao Yingbang
In this work, calcium barium zirconate titanate piezoelectric ceramics 0.4Ba(Zr 0.2 Ti 0.8 )O 3 - 0.6(Ba 0.7 Ca 0.3 )TiO 3 ((1− x )BZT- x BCT, abbreviated as x BCZT, x = 0.6) were prepared by conventional solid state reaction method. Different surfactant additives (SDS, CTAB, PEG, and Tris–HCl, respectively) were added to the ball milling process before sintering. Meanwhile, the temperature and dwelling time during the sintering process were also systematically investigated. Their effects on the microstructural, electrical, and piezoelectric properties of the modified ceramics were investigated. It was found that with the Tris–HCl surfactant, the dispersion of the 0.6 BCZT ceramics was the best, and the average particle size was ~82 nm. By using the SDS surfactant, the ceramics showed the highest relative density, i.e., 97%. For the ferroelectric performances, the largest coercive field ( E c = 5.39 kV/cm) was observed in the sample using the SDS surfactant when the sample was sintered at 1300 °C for 6 h. For the dielectric performances, the largest dielectric constant ( ε ) was found to be 35,366.9 for the sample using CTAB surfactant and sintered at 1300 °C for 4 h. We discovered that CTAB-modified ceramics sintered at 1290 °C for 2 h had the highest maximum polarization P s = 24.975 kV/cm and remnant polarization P r = 8.200 kV/cm and sintered at 1300 °C for 4 h produced the highest piezoelectric constant d 33 and dielectric constant of 94 pC/N and 35,366.7, respectively.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER COMPOSITES
·
2025
·
IF 4.7
Shengwang Yuan,Yihao Hou,Miao He,Lining Wang,Feiwei Yu,Yunhai Ma
The objective of this study was to investigate the potential of using rice husk ash-derived silica (RHA-SiO₂) as a sustainable reinforcing agent for tread rubber composites. This investigation addresses the dearth of systematic research on the mechanical ball milling of RHA-SiO₂ by employing a central composite design within the response surface methodology to meticulously examine the impact of ball milling rotational speed, duration, and sample drying conditions on particle quality post-milling. The study's findings indicate that the rotational speed exerts the greatest influence on RHA-SiO₂ particle size, while drying state also emerges as a crucial factor influencing particle dispersion. The optimal ball milling parameters were identified as 240 r/min for 2 hours under anhydrous ethanol wetting conditions. Furthermore, it was demonstrated that RHA-SiO₂ could preserve the hardness and density of the composite, while simultaneously enhancing its stiffness and resilience by replacing industrial silica in the reinforced tread rubber composite. Notably, a 50% substitution rate resulted in a 23.1% enhancement in tear strength, demonstrating the efficacy of RHA-SiO₂ in bolstering the mechanical properties of rubber composites. Indeed, this work may offer new ways of high value use of agricultural waste and open new horizons for the development of high performance environmentally friendly tyre materials. Highlights RSM was utilized as a RHA-SiO 2 ultrafine ball milling technique with controlled particle size. The optimum ball milling process was 240 r/min for 2 h in the alcoholic state. RHA-SiO 2 exhibited a crystal structure and surface functional groups similar to the industrial silica. Replacement of industrial silica by RHA-SiO 2 improved the mechanical properties of tread rubber composites. RHA-SiO 2 at 50% substitution ratio increased tear strength by 23.1% to 41.76 kN/m.
研究领域:
材料科学
·
环境科学
·
橡胶工业
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Shengqi Ao,Zhansheng Guo,Yicheng Song,Daining Fang,Yinhua Bao
Direct ink writing (DIW) is a promising additive manufacturing technique for fabricating shape-customized lithium-ion batteries (LIBs) due to its simplicity, material compatibility, and shapeability. A key component of DIW is the electrode inks with appropriate rheology and clog-free property for three-dimensional (3D) printed LIBs. Here, a series of clog-free printable electrode inks for LIBs are developed by a practical and universal approach with multiple ball-milled processes. The inks can be used for an ultralong printing process without blockage, showing great printability and rheological properties. The sizes of the electrode particles and secondary aggregates both decrease in the inks, making uniform particle distribution in the dried printed electrodes. Particle transport simulations in the ink flow field also illustrate that smaller particles are less likely to clog the nozzle inlet. Meanwhile, the 3D printed electrodes demonstrate stable cycling stability and rate capability compared to conventional electrodes, showing average discharge capacities of 158.3, 145.8, and 147.4 mAh g–1 in 100 cycles for Li4Ti5O12, LiNi0.815Co0.15Al0.035O2, and LiFePO4 half-cells, respectively. The full cells assembled with printed electrodes also exhibit a comparable discharge capacity. This approach offers a universal and low-cost strategy to manufacture complex electrode structures for customizable energy storage devices.
研究领域:
材料科学
·
增材制造
·
储能技术
·
电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）