JOM
·
2021
·Vol. 73
·期 12
·3727-3733
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IF 2.474
Yang Jiaxin,Tao Wenju,Chen Liyu,He Jingui,Zhang Yifan,Yu Jiangyu,Wang Zhaowen
The preparation of high-purity and high-value alloys is of great significance to industrial production. The purpose of this study is to explore the process of producing aluminum-silicon (Al-Si) alloy by the electrochemical Al-Si eutectoid method. The electrochemical behavior of aluminum and silicon on tungsten electrode was studied by cyclic voltammetry and galvanostatic chronopotentiometry. The effect of SiO 2 addition on the eutectoid behavior of Al and Si was studied. The results show that the precipitation potential of Al is about –1.35 V (versus Pt), and the initial precipitation potential of Si is about –0.8 V (versus Pt). The precipitation process of silicon includes two reduction stages. In addition, the precipitation of Si is a quasireversible reaction controlled by diffusion process. Finally, Al-Si alloy was obtained by potentiostatic electrodeposition at –1.8 V potential, indicating that Al and Si would codeposit at this potential.
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MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2019
·
IF 4.081
Ning Guo,Ping Shen,Rui-Fen Guo,Qi-Chuan Jiang
The strength and toughness of a material are generally two mutually exclusive properties. Optimization of these properties can be realized by regulating microstructures based on a bio-inspired idea. Herein, we used gelatin as a pore-regulating agent to investigate the effect of microstructural transition from “nacre-like” lamellae to “honeycomb-like” reticulae on the mechanical properties of metal–ceramic composites. By introducing different quantities of gelatin into SiC slurries during freeze casting and infiltrating the sintered SiC scaffolds with pure molten Al, we prepared the Al/SiC (88/12 in volume) composites with variable yet controllable microstructures and further demonstrated that the desired properties could be achieved by tailoring their microstructures. Specifically, the Al/SiC composites with a fully laminated structure exhibited optimal fracture toughness ( K Jc ) of 51.9 ± 2.9 MPa m 1/2 while those with a three-dimensional reticular structure displayed peak three-point flexural strength of 371 ± 6 MPa. The relationship between the microstructures and mechanical properties of the composites was addressed based on material strengthening and toughening mechanisms.
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高影响因子
VACUUM
·
2019
·
IF 2.515
Yanjun Yin,Xueming Li
This study focus on the combustion performance and energy released of self-propagating Al/CuO nanothermite with nanorod structure comprehensively. CuO nanorods with lengths of 50 nm–100 nm were synthesized in large scale by template-free hydrothermal method . Al/CuO nanothermite coatings were further built successfully by co-deposition of the as-prepared CuO nanorods and nano-Al via electrophoretic deposition (EPD). Additionally, the EPD kinetic behavior of CuO nanorods and Al/CuO composites is investigated comprehensively. The optimum deposition time is 15 min and the composites is much homogenous when equivalence ratio (Ф) of Al and CuO is 0.75. Furthermore, the onset temperature is down to 315 °C and the energy release is approximately 3043 J/g along with rapid and violent combustion performance in the thermite reaction of Al/CuO nanorods. It is speculated that the excellent properties of the Al/CuO nanothermite could be ascribed to the uniform distributing and intimate interfacial contact between nano-Al and CuO nanorods.
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CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Heng Zhang,Muhammad Usman Tahir,Xiuling Yan,Xueming Liu,Xintai Su,Lijuan Zhang
Using sodium oleate as surfactant and intercalating agent, a regulated Ni-Al layered double hydroxide (NA-LDH-OA) nanosheets with a high interlayer space were prepared by two-phase method combined with a short reflux process and mild solvothermal reaction. In the process of electrochemical reaction, the electron transport is accelerated by the higher base spacing of the NA-LDH-OA ultrathin nanosheets. The as-prepared material exhibited a high specific capacity (1.040 C cm −2 at a current density of 1.68 mA cm −2 ) and good cycling performance (capacity retention of 88.25% after 2000 cycles) in a three-electrode system. Moreover, an aqueous asymmetric supercapacitor (ASC) was assembled using the synthesized NA-LDH-OA nanosheets as the positive electrode and activated carbon (AC) as the negative electrode. The aqueous ASC device (NA-LDH-OA-2//AC) achieved a high energy density of 40.26 Wh kg −1 at a power density of 943 W kg −1 , and a good cycling performance of 94.5% retention after 5000 cycles. These results demonstrated that the NA-LDH-OA nanosheets possess the potential for upcoming energy storage devices.
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高影响因子
IONICS
·
2019
·Vol. 25
·期 8
·3859-3866
·
IF 2.289
Bao Wentao,Tian Hua,Jiang Yang,Zhu Kaixin,Zhang Runa,Tan Yu,Li Wang,Yu Zhifeng,Wang Lin
Ni–Al layered double hydroxide with nitrate anions as interlayer building blocks was synthesized by a dual-anion intercalating strategy of hydroxyl and nitrate anions during a facile co-precipitation process. In this case, nitrate anions with low charge densities are capable to expand the interplanar spacing between host layers of Ni–Al layered double hydroxide in the replacement of pristine carbonate anions, benefiting to the diffusion of electrolyte ions to active sites within electrodes. Moreover, the optimization for packed arrangement of Ni–Al layered double hydroxide with nitrate anions nanosheets can be effectively realized by modulating reactant concentrations, leading to the formation of nanolayered structure in favor of increasing electrolyte accessible active sites within electrodes. The optimized Ni–Al layered double hydroxide with nitrate anions achieves a high specific capacitance of 1616 F g −1 at 1 A g −1 together with a capacitance retention of 82% at 10 A g −1 and good cycling stability.
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RSC Advances
·
2019
·Vol. 9
·期 58
·33997-34003
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IF 3.049
Xiao Zhou,Haoran Yu,Yang Liu,Yong Kong,Yongxin Tao,Yong Qin
Co, Al and N tri-doped graphene (CANG) was successfully fabricated via annealing N-doped graphene with Co and Al precursors. The material was characterized by scaning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Raman spectroscopy, physical adsorption, and X-ray photoelectron spectroscopy (XPS). It was found that the as-prepared CANG features a robust three-dimensional hierarchically porous structure. The contents of Co and Al can achieve the maximum value of 2.18 at% and 0.51 at% at the annealing temperature of 950 °C. Upon using the electrocatalyst for the hydrogen evolution reaction (HER), the CANG exhibited remarkable electrocatalytic performance in both acidic (η10 = 105 mV) and alkaline media (η10 = 270 mV), and outperforms Co,N-codoped graphene and Al,N-codoped graphene, respectively. In combination with the density functional theory (DFT) calculations, it was revealed that the introduction of the Al heteroatom can decrease the absolute value of hydrogen adsorption free energy (ΔG(H*)) of Co–N–C catalysts, thus greatly enhancing the HER activity. This discovery will provide new guidance to the design of advanced and inexpensive carbon materials for fuel cell, water-splitting and other electrochemical devices.
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PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Yichao Gong,Junjie Li,Shenghui Yang,Mao Yang,Hao Dang,Yingying Ren,Guojun Zhang,Tiecheng Lu
Investigations on the doping modification of tritium breeding materials have been becoming one of the interesting research areas in the past few years. Recently, preparation method, mechanical and physical properties and tritium release behavior of Li 4+x Si 1-x Al x O 4 solid solution have been studied because of its potential advantages in the field of tritium breeding materials. In this paper, a facile approach was proposed to prepare Li 4+x Si 1-x Al x O 4 pebbles with a relatively small grain. TG/DSC and XRD were conducted to investigate the formation process of Li 4+x Si 1-x Al x O 4 . The results showed the crushing strength and thermal conductivity were obviously improved by introduction of hetero-element Al into Li 4 SiO 4 , and the optimal x value for Li 4+x Si 1-x Al x O 4 was 0.2 from the point of high crushing strength and thermal conductivity. This study will be expected to provide references for fabricating other solid solution tritium breeders.
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INORGANICA CHIMICA ACTA
·
2018
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IF 2.264
Yebin Guan,Ming Xia,Xiaohong Wang,Weicheng Cao,Alessandro Marchetti
Nano-sized NH 2 -MIL-53(Al) particles were conveniently synthesized in aqueous solution at ambient temperature with a widely applicable mixing method, and the morphology and character were examined with a series of techniques. XRD patterns and TEM images showed that the obtained NH 2 -MIL-53(Al) material possessed rod-like shape, which is different from those obtained from N, N-dimethyl formamide (DMF). This nano-sized NH 2 -MIL-53(Al) matrix displayed enhanced efficiency for adsorptive elimination of methyl blue molecules in aqueous solution.
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高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Hanqin Liang,Huilu Guo,Jinwei Yin,Kaihui Zuo,Yongfeng Xia,Dongxu Yao,Jian Zhang,Yuping Zeng,Shiwei Wang
Transparent AlON ceramics were bonded with Lu-Al-Si-O-N oxynitride glass interlayer at 1450 °C in nitrogen atmosphere in this investigation. The Lu-Al-Si-O-N oxynitride glass showed good wettability on the AlON substrate and had strong interface adhesion with each other. The joining process had no detrimental effect on the in-line transmittance of transparent AlON ceramics but caused slight decrease of flexural strength due to the partial decomposition. The bonding strength of AlON/AlON joint was 142.7 ± 6.3 MPa at room temperature and 110.1 ± 9.6 MPa at 1200 °C in situ, which were comparable with those of the parent AlON ceramics. Some Lu 2 Si 2 O 7 grains crystallized out from the glass interlayer after joining.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2014
·
IF 2.063
Ran-ran Shan,Liang-guo Yan,Yan-ming Yang,Kun Yang,Shu-jun Yu,Hai-qin Yu,Bao-cun Zhu,Bin Du
The Mg–Al-CO 3 -LDH with Mg 2+ /Al 3+ molar ratio of 2 was prepared via coprecipitation method at constant pH of 9–10 and used to remove three red dyes by batch adsorption method. The results showed the Mg–Al-LDH were well crystallized and can adsorb the red dyes effectively. The optimal adsorbent dosage and contact time were 1.0 g and 60 min, respectively. Adsorbed amount hardly changed when pH < 10. The adsorption kinetics fit the pseudo-second order kinetic models well and isotherms correspond to Langmuir model strictly. All the relevant mechanisms were studied and manifested as anion exchange and also electrostatic attraction for CR.
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RSC Advances
·
2016
·Vol. 6
·期 6
·5100-5110
·
IF 3.289
Yinghao Wu,Wenjie Zhao,Wurong Wang,Wenjie Sui
Aluminum alloys with novel binary anti-corrosion structures on the surface showing superhydrophobic properties were fabricated via chemical etching, anodic oxidation and chemical modification. Surface morphologies and chemical elements of the as-prepared films were investigated by Fourier transform infrared spectrometer, scanning electron microscopy and confocal laser scanning microscope. Surface wettability was investigated by the contact angle meter. Manipulation of surface morphology by anodic oxidation current density and the influence of surface chemical modification on the wettability were investigated. The anti-corrosion properties of the as-prepared films were characterized using an electrochemistry workstation. The results showed that surface water contact angle could reach 156° after chemical modification when the current density of anodic oxidation was 5 A dm−2. The corrosion potential (Ecorr) was positively increased from −1189 mV for bare Al alloys to −304 mV for the samples anodized at 5 A dm−2. The synergetic effect between the protective properties of air trapped in a low adhesion superhydrophobic surface and good barrier properties of the barrier layer of anodic oxidation film was remarkably enhanced the corrosion resistance of aluminum alloys. Influences of the anodic oxidation current density and the self-assembled films on the anti-corrosion performance were discussed in detail.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2016
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IF 2.76
Zaihang Zheng,Yan Liu,Yuan Bai,Jijia Zhang,Zhiwu Han,Luquan Ren
Inspired by typical creature living surface with hydrophobicity, the hydrophobic graphene surface was successfully achieved on aluminium alloy substrate by a novel route. It is composed of two steps: biomimetic microstructure processing (BMP) on substrate and then preparation-transfer process of graphene via chemical vapor decomposition (CVD). The surface structure morphology, wettability and anti-corrosion were systematically investigated. It was found that the static water contact angle for the as-prepared surface was as high as 130.8 ± 1°, demonstrating that the hydrophobic surface is formed on aluminium alloy substrate. It can be interpreted by the synergistic effect between BMP and CVD methods in constructing the biomimetic and hydrophobic graphene surface. Besides, the anti-corrosion property of Al alloy was improved by forming CVD-grown graphene coating on the substrates according to the results of electrochemical corrosion experiments. The synergistic method was not only applied to fabricate hydrophobic graphene film but also provided a versatile route in multifunctional graphene film suited in wide application.
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高影响因子
危险品化学品经营许可证（带存储）