JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Peibo Li,Guoqiang Luo,Xiaoshan Zhang,Xiao Wang,Zhihao Wu,Yi Sun,Qiang Shen
As one of the most commonly used binary alloys , the effect of intermetallic compounds (IMCs) of Al-Cu alloys in powder metallurgy on their structure and properties is instructive for tailoring Al-Cu alloys for different applications. In this investigation, a series of Al-Cu-Ag alloys with varying Cu compositions were fabricated via hot pressing. TEM analysis identified CuAl 2 as the primary intermetallic compounds , with Ag existing in forms including Ag 2 Al, elemental Ag, and an Ag-(Cu) solid solution . The modulation of Cu content influenced the state of Ag and the mechanical behaviors of the Al-Cu-Ag alloy. Particularly, the high Al/Cu alloy, benefiting from a synergistic effect comprising stacking faults, nanoscale precipitates, and solid solutions, exhibited outstanding mechanical properties. Conversely, the Al-50Cu-3Ag alloys displayed significant brittleness , attributed to the adverse impact of large-scale intermetallic compounds and increased grain size due to the formation of CuAl 2 . The incorporation of nanoparticles effectively mitigated the grain size in high Al/Cu alloys. This study elucidates the correlation between the evolution of intermetallic compounds and composition in Al-Cu alloys, offering novel insights into the reinforcement of both Al-based and Cu-based alloys.
研究领域:
材料科学
·
金属学与热处理
·
粉末冶金
·
结构材料
·
合金设计
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DOI
高影响因子
IONICS
·
2019
·Vol. 25
·期 3
·1235-1242
·
IF 2.289
Qiao Jia,Zhou Haitao,Liu Zhongsheng,Wen Hejing,Yang Jianhong
Al-ion batteries are proposed as promising energy storage candidates for beyond Li-ion technology due to the higher natural earth of Al metal. Recently, various graphite and graphene cathodes for Al-ion batteries have been studied in this regard, but their costs are not satisfactory. In this study, a novel cathode for Al-ion batteries is prepared by graphitizing inexpensive soft carbon materials (mesocarbon microspheres and petroleum coke) at 2800 °C. The charge and discharge process is showcased here for graphitized petroleum coke, which has a storage capacity of 77.7 mAh g −1 with two high discharge voltage (~ 2.25 and 1.80 V), higher than graphitized mesocarbon microspheres (51 mAh g −1 ). It also has excellent cycle stability and no reduction in specific capacity after 1000 cycles. Affordable cost of the graphitized petroleum coke cathode makes Al-ion battery more promising for large-scale chemical energy storage.
研究领域:
电化学储能
·
材料科学
·
能源化学
·
无机非金属材料
·
电池技术
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·Vol. 47
·期 16
·22768-22775
·
IF 4.527
Libin Zhuang,Xiao Huang,Yang Lu,Jiawen Tang,Yongjian Zhou,Xin Ao,Yan Yang,Bingbing Tian
Cubic phase garnet-type Li 7 La 3 Zr 2 O 12 (LLZO) is a promising solid electrolyte for highly safe Li-ion batteries. Al-doped LLZO (Al-LLZO) has been widely studied due to the low cost of Al 2 O 3 . The reported ionic conductivities were variable due to the complicated Al 3+ -Li + substitution and Li x AlO y segregation in Al-LLZO ceramics. This work prepared Li 7−3 x Al x La 3 Zr 2 O 12 ( x = 0.00~0.40) ceramics via a conventional solid-state reaction method. The AC impedance and corresponding distribution of relaxation times (DRT) were analyzed combined with phase transformation, cross-sectional microstructure evolution , and grain boundary element mapping results for these Al-LLZO ceramics to understand the various ionic transportation levels in LLZO with different Al-doping amounts. The low conductivity in low Al-doped (0.12~0.28) LLZO originates from the slow Li + ion migration (1.4~0.25 μs) in the cubic-tetragonal mixed phase. On the other hand, LiAlO 2 and LaAlO 3 segregation occur at the grain boundaries of high Al-doped (0.40) LLZO, resulting in a gradual Li + ion jump (6.5 μs) over grain boundaries and low ionic conductivity. The Li 6.04 Al 0.32 La 3 Zr 2 O 12 ceramic delivers the optimum Li + ion conductivity of 1.7 × 10 −4 S cm −1 at 25 °C.
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DOI
高影响因子
COMBUSTION AND FLAME
·
2024
·
IF 5.8
Yuxiang Li,Kejuan Meng,Momang Tian,Lei Zhang,Xiaoxia Ma,Kaili Zhang
Metastable intermolecular composites (MICs) typically use Al as fuel and transition metal oxides as oxidizers , while their reactivities are hindered by the inert Al 2 O 3 passivation layer on the surface of Al particles . Recently, transition metal fluorides have emerged as novel fluorine-containing oxidizers for promoting the reactivity of metal fuels through interfacial fluorination of oxide layer . In this work, nanosized CoF 2 and Co 3 O 4 were prepared through pyrolysis of CoF 2 ·4H 2 O precursor using different calcination conditions. To investigate the function of CoF 2 in reaction and the influence of CoF 2 content on reactive performances, a series of MICs composed of n-Al, Co 3 O 4 , and CoF 2 were prepared through ultrasonic dispersion method. Thermal analysis indicated that Al/CoF 2 composite had significantly higher specific heat release (2.30 kJ/g) than that of Al/Co 3 O 4 composite (1.45 kJ/g), and CoF 2 facilitated the occurrence of exothermic reaction at a relatively lower temperature. AlF 3 was found as main reaction products of Al/CoF 2 at 650 °C, and AlF 3 sublimes at the temperature above 850 °C. Although the pressure output and flame intensity of Al/CoF 2 composite is lower than that of Al/Co 3 O 4 composite, hybrid Al/Co 3 O 4 /CoF 2 composites with 20 %–35 % CoF 2 showed significantly enhanced energetic performances compared with sole Al/Co 3 O 4 , suggesting that CoF 2 can function as an effective reaction modifier.
研究领域:
材料科学
·
含能材料
·
燃烧化学
·
纳米材料
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DOI
高影响因子
APPLIED CLAY SCIENCE
·
2017
·
IF 3.101
Ning Mao,Chun Hui Zhou,John Keeling,Saverio Fiore,Hao Zhang,Liang Chen,Gui Chen Jin,Ting Ting Zhu,Dong Shen Tong,Wei Hua Yu
Dolomite is a widespread carbonate mineral that has been investigated extensively over the past two centuries. Despite the high level of investigation, aspects of the environmental conditions of crystallization, diagenesis and dissolution remain elusive and the transformation of dolomite into other value-added products is still challenging. This work shows a novel, cleaner method to dissolve dolomite by taking advantage of the acidity from the hydrolysis of Lewis acid AlCl 3 and as such the mineral can be efficiently converted into Ca-Mg-Al layered double hydroxide (LDH). The dolomite and the resulting Ca-Mg-Al LDH samples were characterized by powder X-ray diffraction (XRD), Fourier transformed infrared spectroscopy (FT-IR), thermogravimetric analysis (TG), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The composition of the products was measured by energy dispersive spectrometer-mapping (EDS-mapping), X-ray fluorescence (XRF) and atomic absorption spectroscopy (AAS). Particle sizes of the products were measured by a dynamic light scattering method. It is documented, for the first time, that dissolution of dolomite in AlCl 3 aqueous solution is facilitated by hydrothermal treatment . Well-crystallized Ca-Mg-Al LDH crystals are achieved under (Ca + Mg): Al molar ratio = 1:1, pH = 10.5 via a simple co-precipitation method. The maximum utilization efficiencies of Ca 2+ , Mg 2+ from dolomite to LDH are 36.3% and 95.5%, respectively. The possible mechanisms of LDH formation were: 1) the dolomite dissolved in the strong acid solution due to the hydrolysis of AlCl 3 and thus provided Ca 2+ and Mg 2+ ; 2) with addition of NaOH, Al 3+ cations precipitated to form Al(OH) 3 (at 8.3 ≤ pH ≤ 9.3) and then part of the Al(OH) 3 reacted with Ca 2+ and Mg 2+ to form the Ca-Mg-Al LDH; 3) at pH = 10.5, the Al(OH) 3 was transformed as [AlO(OH)] and meanwhile Ca 2+ , Mg 2+ and Al 3+ took part in the formation of Ca-Mg-Al LDH; 4) when pH = 10.6, [AlO(OH)] reacted with NaOH to dissolve into [Al(OH) 4 ]− and the [Al(OH) 4 ]− finally co-precipitated with Ca 2+ and Mg 2+ to form the Ca-Mg-Al LDH during heating for drying.
研究领域:
材料科学
·
矿物加工
·
无机化学
·
环境地球化学
·
湿法冶金
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DOI
高影响因子
Defence Technology
·
2021
·
IF 3.172
Yan-jun Yin,Feng Hu,Le-hua Cheng,Xiao-dong Wang
Thermite films are typical energetic materials (EMs) and have great value in initiating explosive devices. However, research in thermite film preparation is far behind that of research in thermite powders. Electrophoretic deposition (EPD) is an emerging, rapid coating method for film fabrication, including of energetic composite films. In this work, a polytetrafluoroethylene (PTFE)/Al/CuO organic-inorganic hybrid energetic film was successfully obtained using the above method for the first time. The addition of lithocholic acid as a surfactant into the electroplating suspension enabled PTFE to be charged. The combustion and energy release were analyzed by means of a high-speed camera and differential scanning calorimetery (DSC). It was found that the combustion process and energy release of PTFE/Al/CuO were much better than that of Al/CuO. The main reason for the excellent combustion performance of the hybrid PTFE/Al/CuO system was that the oxidability of PTFE accelerated the redox reaction between Al and CuO. The prepared PTFE/Al/CuO film was also employed as ignition material to fire a B–KNO 3 explosive successfully, indicating considerable potential for use as an ignition material in micro-ignitors. This study sheds light on the preparation of fluoropolymer-containing organic-inorganic hybrid energetic films by one-step electrophoretic deposition.
研究领域:
材料科学
·
含能材料
·
电化学
·
燃烧物理
✓ 已验证
DOI
高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Yifei Wang,Wending Pan,Kee Wah Leong,Xinhai Xu,Guangzhong Dong,Xinguo Ye,Mingming Zhang,Dennis Y.C. Leung
Metal ion batteries with “water-in-salt” electrolyte are well known for their low cost and high safety, which are especially suitable for powering wearable electronics . Among them, the Al ion battery holds a great advantage in metal abundance and energy density , which has also been proved reliable with the “water-in-salt” electrolyte system. To facilitate its efficient manufacturing, screen-printing is adopted to develop a “water-in-salt” Al ion battery for the first time. Both the Al anode ink and the graphite cathode ink are prepared and printed onto opposite sides of a cellulose paper, while the “water-in-salt” AlCl 3 electrolyte is stored inside the paper by an absorption-evaporation process. Specifically, three anode printing configurations are compared, whose effect on battery performance and durability is studied comprehensively. In general, the battery prototype can sustain a high specific current of 1.0 A g −1 and specific capacity of 120 mAh g −1 . A satisfactory lifetime of 550 cycles is also achievable at a lower specific current of 0.25 A g −1 . Moreover, this battery can tolerate repetitive bending of 1000 times and even the puncture of its electrodes, proving its great flexibility, robustness and safety for wearable applications. The monolithic battery pack printing is also demonstrated successfully in the end.
研究领域:
储能
·
材料科学
·
柔性电子学
·
电化学
·
电池技术
✓ 已验证
DOI
高影响因子
PROPELLANTS EXPLOSIVES PYROTECHNICS
·
2023
·Vol. 48
·期 3
·e202200313
·
IF 1.8
Xiang-Dong Meng,Shui-Zhou Cai
In this study, the Al-B-Mo alloy powders with a boron content of 7 wt % and Molybdenum content of 0.5–3 wt % were prepared by the close-coupled gas atomization. The powder morphology, phase composition, oxidation, and exothermic behavior of combustion were characterized. The results show that the addition of Mo effectively improves the energetic properties of the alloy powder, with the mass-burning enthalpy of Al-7B-1Mo reaching 31111 J/g, exceeding the theoretical mass-burning enthalpy of monolithic Al (31000 J/g). Al-7B-1Mo underwent a violent exothermic process at around 1000 °C, and the oxidation weight gain ratio and oxidation efficiency reached 46.16 % and 48.05 % respectively, an increase of 19.75 % and 21.08 % compared to Al-7B. The mesh structure formed by the AlB 2 phase on the particle surface positively promoted the particles′ thermal oxidation. Mechanical mixtures of AlB 2 /Mo and AlB 2 /MoO 3 were prepared and the catalytic promotion of the combustion of AlB 2 by Mo and MoO 3 was confirmed by thermal tests of combustion. The mechanism by which Mo/MoO 3 promotes the combustion of AlB 2 was investigated through the phase composition characterization of the composite powder after heat treatment in argon and air atmosphere. It was confirmed that MoO 3 promotes the oxidation and combustion of AlB 2 by supplying oxygen to B in AlB 2 , while Mo is first oxidized to MoO 3 , which then promotes the combustion of AlB 2 .
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Chang Zhou,Yongxiao Zhou,Saiyue Liu,Lianyu Zhang,Peiyu Song,Qiang Zhang,Biyuan Ma,Gaohui Wu
Negative thermal expansion particles can compensate metal matrix composites to achieve near-zero thermal expansion materials. However, there are huge thermal residual mismatch stresses in the particles due to the thermal expansion mismatch between matrix and reinforcement. The use of hybrid reinforcement is required to solve the stress concentration problem. In this study, the hybrid Al matrix composites reinforced with ZrW 2 O 8 and SiC reinforcements (SiCp, SiCnw) were fabricated by the pressure infiltration process. The effect of SiC content on microstructure, phase composition, thermal expansion and mechanical properties were examined by a combination of XRD , SEM, thermal dilatometer and bending tests. The results showed that the high-pressure phase (γ-ZrW2O8) content of hybrid metal matrix composites decreased with increasing SiC fraction. Among them, the composites containing 61.7 vol%ZrW 2 O 8 and 3.3vol%SiCnw achieved the best performance with a bending strength of 100–150 MPa and a near-zero thermal expansion (2.0–3.0 ×10 –6 K −1 ) in a wide range of − 50–120 °C, which was attributed to the synergetic hybrid effects of SiCnw and ZrW 2 O 8 . This work opens up a new frontier for the design and preparation of lightweight zero-thermal expansion materials.
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Ruolin Wang,Wenjuan Sun,Haisheng Han,Wei Sun,Zhao Wei,Jian Peng
The flotation separation of scheelite from fine calcite is difficult due to the larger specific surface area and higher activity with flotation collectors. The selectivity of caustic starch as the depressant is poor, due to the -OH functional group reacting with the similar Ca 2+ active sites of scheelite and calcite. In this paper, a novel structure of Al-caustic starch is prepared by the reaction of Al 3+ and caustic starch, which has a new functional group of -CH 2 -O-Al 2+ . The Al-caustic starch is an effective depressant for the fine calcite particles, contributing to the efficient flotation separation of scheelite from the fine calcite particles. All the flotation kinetics of scheelite and fine calcite is first-order uniform distribution model, and the flotation rate of calcite decreases significantly after the treatment of Al-caustic starch. The zeta potential of Al-caustic starch is much higher than that of caustic starch, and Al-caustic starch can selectively change the surface charge of fine calcite, instead of scheelite. The X-ray photoelectron spectroscopy (XPS) spectrum of Al-caustic starch appears the peak of Al atom, which chemisorb on the calcite surface and make the peak of characteristic atoms shift. Moreover, Al-caustic starch reacts with the anion of CO 3 2- on fine calcite surface, instead of cation of Ca 2+ , which obviously improves the selective adsorption on mineral surface.
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产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2022
·
IF 8.047
Minjie Xu,Xianglin Liu,Guiyao Song,Yingying Cai,Bianfang Shi,Yitao Liu,Xiaoxu Ding,Zixu Yang,Pengfei Tian,Chenxi Cao,Jing Xu
Different iron species exhibit distinct activity and selectivity in CO 2 hydrogenation reaction. Herein, by controlling calcination temperature, Fe-Al interaction in Na promoted Fe-Al catalysts has been regulated, which further leads to various compositions of iron oxide (FeO x ) and iron carbides (Fe 7 C 3 and Fe 5 C 2 ) after CO activation and CO 2 hydrogenation reaction. The phase compositions and structures of Fe-Al catalysts are carefully distinguished by multiple characterizations, including XRD, XPS, MES and TEM, and the reactivity of different phases is studied with the combination of experiments (kinetics, TP and in situ DRIFTS) and Density Functional Theory (DFT) calculations. Our FeAl350 with the highest FeC x content shows the highest CO 2 conversion of 48.2% and the lowest CO selectivity of 10.1%, and FeAl900 with the highest Fe 5 C 2 / FeC x ratio presents the highest C 5+ selectivity of 44.6%. Finally, a correlation between different compositions of iron species with the activity and selectivity of Fe-based for CO 2 hydrogenation to olefins was established.
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产品关联
DOI
高影响因子
Defence Technology
·
2022
·
IF 4.035
Yao-feng Mao,Qian-qian He,Jian Wang,Chuan-hao Xu,Jun Wang,Fu-de Nie
As a typical energetic composite, polytetrafluoroethylene (PTFE)/aluminum (Al) has been widely applied in explosives, pyrotechnics, and propellants due to its ultra-high energy density and intense exothermic reaction. In this work, the radial gradient (RG) structure of PTFE/Al cylinders with three different PTFE morphologies (200 nm and 5 μ m particles and 5 μ m fiber) and content changes are prepared by 3D printing technology. The effect of radial gradient structure on the pressure output of PTFE/Al has been studied. Compared with the morphology change of PTFE, the change of component content in the gradient structure has an obvious effect on the pressure output of the PTFE/Al cylinder. Furthermore, the relationships of the morphology, content of PTFE and the combustion reaction of the PTFE/Al cylinder reveal that the cylinder shows a more complex flame propagation process than others. These results could provide a strategy to improve the combustion and pressure output of PTFE/Al.
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DOI
高影响因子
危险品化学品经营许可证（带存储）