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Synthesis and alumina leaching mechanism of calcium sulphoaluminate

Transactions of Nonferrous Metals Society of China 2017年第9期27卷 2090-2095页

作者： Bo WANG Wei-qin CHU Yuan-liang HAO Shuo RONG Hui-lan SUN School of Materials Science and Engineering Hebei University of Science and TechnologyShijiazhuang 050018 China Hebei Key Laboratory of Material Near-net Forming Technology Hebei University of Science and TechnologyShijiazhuang 050018 China

Calcium sulphoaluminate(3CaO·3Al2O3·CaSO4,abbreviated as C4A3S)was synthesized by sintering at1375°C for2h with analytically pure carbonate calcium,alumina and dihydrate calcium *** crystal structure of C4A3S was characterized by XRD,SEM and *** leaching properties in Na2CO3solution were studied,and the leaching mechanism was investigated by means of Raman spectrum and *** results show that C4A3S has porous *** polycrystallines and single crystals coexist in C4A3S and grow along different *** alumina leaching rate of C4A3S is98.41%,which is higher than that of12CaO·7Al2O3under the optimal *** aluminum and sulfur elements exist in the leaching solution in the form of Al(OH)4and24SO,respectively,and the calcium exists as CaCO3in the leaching residues.

关键词： calcium sulphoaluminate synthesis alumina leaching

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Trivalent Ni oxidation controlled through regulating lithium content to minimize perovskite interfacial recombination

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Rare Metals 2022年第1期41卷 96-105页

作者： Jin-Jin Zhao Xiao Su Zhou Mi Ying Zhang Yan-Jun Hu Hua-Jun Guo Yi-Nan Jiao Yu-Xia Zhang Yan Shi Wei-Zhong Hao Jing-Wei Wu Yi Wang Cun-Fa Gao Guo-Zhong Cao School of Materials Science and Engineering School of Mechanical EngineeringShijiazhuang Tiedao UniversityShijiazhuang 050043China School of Materials Science and Engineering Hebei Key Laboratory of Material Near Net Forming TechnologyHebei University of Science and TechnologyShijiazhuang 050018China State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and AstronauticsNanjing 210016China Department of Materials Science and Engineering University of WashingtonSeattleWA 98195-2120USA

Organic–inorganic hybrid perovskite solar cells,one of the most promising photovoltaic devices,have made great progress in their efficiency and preparation *** this study,uniform,highly conductive Li_(n)NiO_(x)(0≤n... 详细信息

关键词： Lithium ions Ni^(3+) Oxidized defect Photocurrent Perovskite solar cells

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Tuning dual three-dimensional porous copper/graphite composite to achieve diversified utilization of copper current collector for lithium storage

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Rare Metals 2021年第10期40卷 2802-2809页

作者： Xia Ma Zhi-Jia Zhang Jia-Min Wang Shi-Hao Sun Shao-Fei Zhang Shen Yuan Zhi-Jun Qiao Zhen-Yang Yu Jian-Li Kang Wei-Jie Li State Key Laboratory of Separation Membrane and Membrane Processes Tianjin Municipal Key Laboratory of Advanced Fibers and Energy StorageSchool of Materials Science and EngineeringSchool of Mechanical EngineeringTiangong UniversityTianjin 300387China School of Materials Science and Engineering Tianjin UniversityTianjin 300072China School of Materials Science and Engineering Hebei Key Laboratory of Material Near-Net Forming TechnologyHebei University of Science&TechnologyShijiazhuang 050018China Institute for Superconducting and Electronic Materials University of WollongongWollongongNSW 2522Australia

Graphite anode materials are widely used in commercial lithium-ion batteries;however, the long electron/ion transportation path restricted its high energy storage. In this experiment, we designed a copper/graphite composite with a dual three-dimensional(3 D) continuous porous structure combining used nonsolvent-induced phase separation and heat treatment, in which a large amount of graphite is embedded in the 3 D porous copper/carbon architecture. In the novel structure, not only the electron and Li^(+) transmission performances are improved, but also the space of current collector is fully utilized. Meanwhile,carbonized polyacrylonitrile network stabilizes the interface between graphite and copper matrix. The obtained copper/graphite composite anode has an initial discharge capacity of 524.6 mAh·g^(-1), a holding capacity of350 mAh·g^(-1) and excellent cycle stability(299.3 mAh·g^(-1) after 180 cycles at 0.1 C rate), exhibiting good electrochemical performance. The experimental results show that the mass loading of the copper/graphite composite electrode material is about 4.39 mg·cm^(-2). We also envisage replacing graphite with other high-capacity active materials to fill the current collector, which can provide a reference for the future development of next-generation advanced electrodes.

关键词： Graphite anode Copper current collector Dual three-dimensional porous Nonsolvent-induced phase separation Heat treatment

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Study of the solid-state joining process for endless hot rolling 4

Study of the solid-state joining process for endless hot rol...

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4th International Conference on Advanced Design and Manufacturing Engineering, ADME 2014

作者： Dai, Yong Juan College of Materials science and engineering Hebei university of science and technology ShijiazhuangHebei China Hebei key laboratory of material near-net forming technology Hebei university of science and technology ShijiazhuangHebei China Hebei Iron and Steel Technology Research Institute Hebei Iron and Steel Group ShijiazhuangHebei China

ISBN: (纸本)9783038352563

In this study, the joint strength and microstructure of carbon steels welded by an super-deformation joining process in air were investigated. The two block of model steels are overlapped and heated. The steels are welded with 1000% deformation at approximately 1000°C. The joint strengths are evaluated by uniaxial tension testing. The joint microstructures and fractured surfaces are investigated with OM and SEM. The results revealed that the mechanical properties of joint are close to the matrix’s, the grains adjacent to the interface are merged into one grain, which indicates that both blocks are soundly joined, fracture surface was covered with dimple indicating ductile fracture occurred. Joint fracture behavior is initiated by the brittle fracture of scale inclusions and growth around the internal oxides. Surface scale is the most important factor of sound joining. © (2014) Trans Tech Publications, Switzerland.

关键词： Microstructure

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Influence of Aspect Ratio on Giant Magnetoimpedance Effect for Fe_(67)Co_(18)Si_(11)B_4 Amorphous Ribbons

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Acta Metallurgica Sinica(English Letters) 2017年第12期30卷 1236-1242页

作者： Yan-Hong Ding Ke Xue Wei-Yan Wang Xu Ma School of Electrical and Electronic Engineering Tianjin Key Laboratory of Film Electronic and Communication Devices Tianjin University of Technology Tianjin 300384 China School of Material Science and Engineering Tianjin University of Technology Tianjin 300384 China Tianjin Engineering Center of Near-Net-Shape Forming Technology for Metallic Materials Tianjin 300402 China

The effect of sample geometry aspect ratio （l/w） on the giant magnetoimpedance （GMI） in Fe67Co18Si11B4 amorphous ribbons was investigated systematically. The GMI profiles were measured as a function of the external magnetic field at different frequencies up to 110 MHz. The results show that there exists a critical aspect ratio （（l/w）0 = 5.4） below which the maximum GMI effect and sensitivity η decrease with decreasing l/w and above which the maximum GMI effect keeps almost constant and η decreases with increasing l/w. The observed dependence on aspect ratio as （l/w）〈（l/w）0 is correlated with the magnetization process： Complex domain structures emerged near the ribbon ends to decrease the magnetostatic energy, modify the transverse permeability and consequently GMI response. Contributions from transverse permeability and resistance may dominantly determine the change of GMI effect as （l/w）〉（l/w）0.

关键词： Amorphous Magnetic property Magnetoimpedance

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Epitaxial growth of Cu_(2-x)Se on Cu(220)crystal plane as high property anode for sodium storage

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Chinese Chemical Letters 2024年第7期35卷 519-523页

作者： Zhijia Zhang Shihao Sun Yuefang Chen Yanhao Wei Mengmeng Zhang Chunsheng Li Yan Sun Shaofei Zhang Yong Jiang School of Materials Science and Engineering Institute of Quantum Materials and DevicesState Key Laboratory of Separation Membrane and Membrane ProcessesTiangong UniversityTianjin 300387China School of Chemistry and Life Sciences Suzhou University of Science and TechnologySuzhou 215009China Key Laboratory of Advanced Electrode Materials for Novel Solar Cells for Petroleum and Chemical Industry of China Suzhou University of Science and TechnologySuzhou 215009China Hebei Key Laboratory of Flexible Functional Materials/Hebei Key Laboratory of Material Near-Net Forming Technology School of Materials Science and EngineeringHebei University of Science and TechnologyShijiazhuang 050018China

Three-dimentional(3D)transition metal selenides with sufficient channels could produce significant superiority on enhancing reaction kinetics for sodium-ion ***,the thorough exploration of 3D architecture with a facile strategy is still *** we report that a polycrystalline Cu_(2-x)Se film was epitaxial grown on(220)facets-exposed Cu by direct selenization of a nanoporous Cu skeleton,which is obtained by dealloying rolled Cu Mn@Cu alloy *** functional theory calculation result shows strong adsorption energy for Se atoms on Cu(220)planes during selenization reaction,rendering a low energy *** virtue of this core-shell 3D nanoporous architecture to offer abundant active sites and endow fast electron/ion transportation,the nanoporous Cu_(2-x)Se@Cu-0.15 composite electrode exhibits remarkable sodium-ion storage properties with high reversible capacity of 950.6μAh/cm^(2)at 50μA/cm^(2),suprior rate capability of 457.6μAh/cm^(2)at 500μA/cm^(2),as well as an ultra-long stability at a high current *** investigation reveals that the electrochemical reaction is a typical conversion-type reaction with different *** novel electrode synthetic strategy provides useful instructions to design the high-performance anode material for sodium-ion batteries.

关键词： Cu_(2)se 3D architecture Anode materials Density functional theory calculation Sodium-ion battery

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Influence of carbon on mechanical behavior of Fe-Mn-C system alloys

Influence of carbon on mechanical behavior of Fe-Mn-C system...

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作者： Dai, Yong Juan Mi, Zhen Li College of Materials science and engineering Hebei university of science and technology Shijiazhuang 050018 Hebei China Hebei key laboratory of material near-net forming technology Hebei university of science and technology Shijiazhuang 050018 Hebei China National Engineering Research Center for Advanced Rolling technology University of Science and Technology Beijing Beijing 100083 China

ISBN: (纸本)9783038351214

Fe-Mn-C alloys with different carbon content were developed as automobile sheet. Their mechanical properties were studies after hot rolled-cold rolled-different temperature annealed. It was found that carbon element effected mechanical behavior of Fe-Mn-C system alloys seriously. With carbon element increasing its deformation mechanisms turned transformation-induced plasticity (TRIP) effect into twinning-induced plasticity (TWIP) effect. Then the Fe-Mn-C alloys with different carbon content showed different mechanical behavior and different microstructure characterization. © (2014) Trans Tech Publications, Switzerland.

关键词： Manganese alloys

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Effect of thread helix angle on the axial metal flow of cross wedge rolling thread shaft

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2013 International Conference on Advanced materials and Sports Equipment Design, AMSED 2013

作者： Yan, Hua Jun Wang, Li Juan Liu, Yu Zhong Li, Guo Chang Liu, Jin Ping Hu, Zheng Huan School of Materials Science and Engineering Hebei University of Science and Technology Hebei Key Laboratory of Material Near-net Forming Technology Shijiazhuang 050018 China School of Management and Economics Hebei University of Science and Technology Shijiazhuang 050018 China School of Mechanical Engineering University of Science and Technology Beijing Beijing 10083 China

ISBN: (纸本)9783037859025

When rolling thread shaft in cross wedge rolling, forming quality of thread is affected by many process parameters such as the thread helix angle, which is a special and complex parameter. However, there is few study of the effect of the thread helix angle on thread shaft forming. In this paper how thread helix angle affects axial metal flow was analyzed from the perspective of rolling force and the forming process of thread shaft was simulated with different helix angles by the deform-3D software. Through the measurement of the point coordinates, the effect of the helix angle on the axial metal flow of rolled pieces was analyzed. Finally, the conclusion was obtained that helix angle causes the asymmetry of axial metal flow with small difference values for asymmetry and the axial metal flow of rolled pieces increases as the helix angle increases. The rolling thread segment can be ensured in the middle of rolled pieces by moving the blank a suitable distance in the reverse direction of the axial flow direction. © (2014) Trans Tech Publications, Switzerland.

关键词： Thread rolling

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FEM Analysis Of Stamping Process For Vehicle Cowl Inner Panel

FEM Analysis Of Stamping Process For Vehicle Cowl Inner Pane...

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2015 3rd International Conference on Mechanical Engineering and Intelligent Systems(ICMEIS 2015)

作者： Huajun Yan Shibo Ma Lijuan Wang Ying Gao School of Materials Science and Engineering Hebei University of Science and Technology Hebei Key Laboratory of Material Near-net Forming Technology

As the important component for bearing collision in the front of the vehicle, the cowl inner panel has complex shape features such as bulges, reinforcing ribs and holes. When the panel is formed, defects of wrinkling, cracking or incomplete forming will occor. The drawing die is designed for a certain type of the cowl inner panel, and the drawing process is simulated using analysis software Dynaform, and influence laws of the binder force and fillet radii of addendum surface are researched, and process parameters are optimized, that is the binder force F equals to 500 kN, the fillets r equals to 25 mm, r2 equals to 25 mm. The conclusion has a certain effect on forming parts with high quality.

关键词： cowl inner panel addendum surface binder force numerical simulation

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Synthesis of titanium carbonitride powders by reactive ball milling of titanium, graphite and urea

Synthesis of titanium carbonitride powders by reactive ball ...

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4th International Conference on Advanced Engineering materials and technology, AEMT 2014

作者： Sun, Jin Feng Quan, Kun Sun, Ji Sheng Meng, Yong Qiang Key Lab of Material Near Net Forming Technology of Hebei Provice Shijiazhuang Hebei China College of Materials Science and Engineering Hebei University of Science and Technology Shijiazhuang Hebei China Polythechnic College of Hebei University of Science and Technology Shijiazhuang Hebei China Liaoning Light Industry Science Research Institute Shenyang Liaoning China

ISBN: (纸本)9783038352068

Titanium carbonitride (TiCN) nanocrystaline powders were syntheiszed by reactive ball milling of titanium, graphite and urea. GN-2 ball milling was used and the rotation speed was 600rpm. The ratio of ball to material was 30:1, the milling time was from 10 hours to 50 hours. The powders milled for different time were analyzed by X-ray diffraction. The results show that TiCN powders can be synthesized by milling 10 hours, although some raw materials remained. After milled for 50 hours, the raw materials can reactive completely to form TiCN and the grain size of the TiCN powder was about 7 nm. © (2014) Trans Tech Publications, Switzerland.

关键词： Urea

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