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Role of iron ore in enhancing gasification of iron coke:Structural evolution,influence mechanism and kinetic analysis

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International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 58-69页

作者： Jie Wang Wei Wang Xuheng Chen Junfang Bao Qiuyue Hao Heng Zheng Runsheng Xu School of Chemistry and Materials Science Hubei Engineering UniversityXiaogan 432000China Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and TechnologyWuhan 430081China Institue of Ironmaking Technology Baosteel Central Research InstituteShanghai 201999China State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

The utilization of iron coke provides a green pathway for low-carbon *** uncover the influence mechanism of iron ore on the behavior and kinetics of iron coke gasification,the effect of iron ore on the microstructure of iron coke was ***,a comparative study of the gasification reactions between iron coke and coke was conducted through non-isothermal thermogravimetric *** findings indicate that compared to coke,iron coke exhibits an augmentation in micropores and specific surface area,and the micropores further extend and *** provides more adsorption sites for CO_(2) molecules during the gasification process,resulting in a reduction in the initial gasification temperature of iron *** the heating rate in non-isothermal gasification can enhance the reactivity of iron *** metallic iron reduced from iron ore is embedded in the carbon matrix,reducing the orderliness of the carbon structure,which is primarily responsible for the heightened reactivity of the carbon *** kinetic study indicates that the random pore model can effectively represent the gasification process of iron coke due to its rich pore ***,as the proportion of iron ore increases,the activation energy for the carbon gasification gradually decreases,from 246.2 kJ/mol for coke to 192.5 kJ/mol for iron coke 15wt%.

关键词： low-carbon ironmaking iron coke gasification structural evolution kinetic model

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Effect of ion solvation energy on electrohydrodynamic behavior of ionic liquid droplets in electrospray thrusters

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Chinese Journal of Aeronautics 2025年第3期38卷 222-233页

作者： Yipeng FAN Chong CHEN Huifeng KANG Guangqing XIA Chang LU Yajie HAN State Key Laboratory of Structural Analysis Optimization and CAE Software for Industrial EquipmentDalian University of TechnologyDalian 116024China Key Laboratory of Advanced Technology for Aerospace Vehicles of Liaoning Province Dalian University of TechnologyDalian 116024China Collaborative Innovation Center of Micro&Nano Satellites of Hebei Province North China Institute of Aerospace EngineeringLangfang 065000China

The electrospray thruster supplied by ionic liquid is a promising micro-propulsion thruster with small size and precise thrust, which can emit both cations and anions to achieve self-neutralization. In order to further investigate the effect of ion solvation energy on the evaporation of cations and anions from ionic liquid under the action of a uniform electric field, this paper establishes a transient Electrohydrodynamic (EHD) model for free ionic liquid droplets undergoing ion evaporation. The dynamic processes of droplet deformation and ion evaporation are simulated. And the study further focuses on the influence of different ion solvation energies for cations on the droplet morphology and the ion evaporation characteristics at the positively charged end and negatively charged end of the droplet. The results indicate that, when the ion solvation energy for cations is higher than that of anions, it will cause the ion evaporation at the positively charged end of the droplet to lag behind the ion evaporation at the negatively charged end. And the higher the ion solvation energy for the cations, the longer the evaporation lag time at the positively charged end of the droplet, which will lead to a higher peak of surface charge density that can be reached, resulting in a larger evaporation current and sharper droplet stretching deformation. Additionally, the peak surface charge density of the positively charged end of the droplet is linearly related to the ion solvation energy for cations, while the peak surface charge density of the negatively charged end remains almost unchanged and is not significantly affected by the ion solvation energy for cations.

关键词： Ionic liquid Electrospray Electrohydrodynamics Ion solvation energy Ion evaporation

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Brief review of external physical field-boosted low-temperature electrodeposition for metals and alloys

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International Journal of Minerals,Metallurgy and Materials 2025年第5期32卷 992-1007页

作者： Junjian Zhou Zhiyuan Li Qi Wang Na Li Xu Li Yana Wang Weili Song Institute of Advanced Structure Technology Beijing Institute of TechnologyBeijing 100081China Beijing Key Laboratory of Lightweight Multi-Functional Composite Materials and Structures Beijing Institute of TechnologyBeijing 100081China School of Materials Science and Engineering Sun Yat-Sen UniversityGuangzhou 510006China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai Zhuhai 519082China State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China School of Mechanical and Vehicular Engineering Beijing Institute of TechnologyBeijing 100081China

Electrochemical metallurgy at low temperature(<473 K)shows promise for the extraction and refinement of metals and alloys in a green and sustainable ***,the kinetics of the electrodeposition process is generally slow at low temperature,resulting in large overpotential and low current ***,the application of external physical fields has emerged as an effective strategy for improving the mass and charge transfer processes during electrochemical *** review highlights the challenges associated with low-temperature electrochemical processes and briefly discusses recent achievements in optimizing electrodeposition processes through the use of external physical *** regulating effects on the optimization of the electrodeposition process and the strategies for select-ing various external physical fields,including magnetic,supergravity,and ultrasonic fields are summarized from the perspectives of equipment and ***,advanced methods for in-situ characterization of external physical field-assisted electrodeposition processes are reviewed to gain a deeper understanding of metallic *** in-depth exploration of the mechanism by which external physical fields affect the electrode process is essential for enhancing the efficiency of metal extraction at low temperatures.

关键词： low-temperature electrodeposition external physical field electrode kinetics low-temperature electrolyte in-situ characteriz-ation methods

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Incommensurate modulated structure and its influence on the martensitic transformation temperature span of single phase multielement Ni-Cu-Co-Mn-Ga two-way shape memory single crystals

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材料科学技术（英文版） 2025年第5期208卷 230-240页

作者： Qijjia Yu Yang Liu Chen Si Wenjia Wang Jiaxi Meng Jingmin Wang Jinghua Liu Chengbao Jiang Key Laboratory of Advanced Aerospace Materials and Performance(Ministry of Education) School of Materials Science and EngineeringBeihang UniversityBeijing 100191PR China Center of Microstructure Science Frontier Institute of Science and TechnologyState Key Laboratory for Mechanical Behavior of MaterialsXi'an Jiaotong UniversityXi'an 710049PR China

Significant two-way shape memory effect(TWSME)was achieved in single crystals of single-phase mul-tielement Ni42-xCu8CoxMn37Ga13(8 ≤ x ≤ 12)alloys by performing thermomechanical ***,anomalous dependence of the martensitic transformation temperature span on Co content was *** training,quite a narrow temperature span of the martensitic transformation,nearly independent of the Co content,was observed in all single *** training the temperature span was still narrow for 8 ≤ x ≤ 10.9 but was obviously expanded for 10.9＜x ≤ ***-resolution transmission electron microscopy revealed that at the atomic scale,there exists incommensurate modulated structure in the single phase single crystals,as evidenced by nonperiodic satellite spots in the selected area electronic diffraction ***,the modulated wave vector of the satellite spots was increased by higher Co *** first principal calculations it was considered that the incommensurate modulated structure originates from the formation of Co-Co *** training arrays of ordered dislocations with the same Burgers vector were introduced for 8 ≤ x ≤ 10.9 but the network of dislocations was formed for 10.9＜x ≤ *** on analysis of transmission electron microscopy,geometric phase,thermody-namics,and Landau theory,it was considered that the austenite/martensite phase interface was pinned by the network of dislocations,expanding the temperature span of the martensitic *** work supplies new insights for understanding the microstructure and martensitic transformation of Ni-Mn-Ga-based alloys.

关键词： Martensitic transformation Incommensurate modulated structure Temperature span Dislocation Two-way shape memory effect

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Tungsten-substituted zeolite-regulated unsaturated cobalt atoms for robust light alkane dehydrogenation

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Journal of Energy Chemistry 2025年第4期103卷 525-534页

作者： Xichen Yin Tianjun Zhang Yanhang Ma Qiming Sun Innovation Center for Chemical Science College of Chemistry Chemical Engineering and Materials Science Jiangsu Key Laboratory of Advanced Negative Carbon Technologies Soochow University State Key Laboratory of New Pharmaceutical Preparations and Excipients College of Chemistry and Materials Science Hebei University Shanghai Key Laboratory of High-resolution Electron Microscopy & School of Physical Science and Technology Shanghai Tech University

The dehydrogenation of alkanes has emerged as a vital complementary process to address the increasing global demand for olefins.A key challenge remains in the construction of novel active centers that offer superior activity,stability,and ***,tricoordinated cobalt atoms were successfully fabricated through an in-situ ligand-protected synthesis by introducing tungsten atoms into zeolite *** unsaturated Co species efficiently activate C-H bonds while suppressing C-C bond cleavage,resulting in exceptional catalytic activity and olefin selectivity in both propane and ethane dehydrogenation *** optimized Co0.2%@0.01W-S-1 catalyst demonstrated an impressive propylene formation rate of 15.2 molC3H6gcC h-1at 823 K and an ethylene formation rate of 240.3molC2H4gCo-1h-1at 913 K,with propylene and ethylene selectivities of 99.0% and 97.5%,*** results not only significantly surpass conventional tetracoordinated Co catalysts but also rival some Pt-based catalysts under similar ***,the catalyst exhibited excellent stability in dehydrogenation reactions,with no significant loss in catalytic activity after five consecutive regeneration *** work offers valuable insights into the design of zeolite-supported non-precious metal catalysts with high activity and durability for efficient alkane dehydrogenation.

关键词： Ethane dehydrogenation Heterogeneous catalysis Propane dehydrogenation Tricoordinated cobalt Tungsten-substituted zeolite

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Coherent Cu-rich nanoprecipitates: Achieving both high strength and superior magnetic properties in non-oriented silicon steels

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Journal of Materials Science and technology 2025年 233卷 319-333页

作者： Cheng, Zhaoyang Wen, Qiuyue Zhong, Bolin Liang, Yongfeng Zhang, Xiaobin Liu, Jing The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and Technology Wuhan430081 China State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing 100083 China Guangdong Provincial Key Laboratory of New Energy Materials Service Safety College of Material Science and Engineering Shenzhen University Shenzhen518060 China Hubei Engineering Technology Research Center of Marine Materials and Service Safety Wuhan University of Science and Technology Wuhan430081 China

Non-oriented silicon steels with both excellent magnetic properties and high strength are essential for the drive motors of new energy vehicles. However, achieving a balance between strength and magnetic properties is a challenging task. This study successfully developed non-oriented silicon steel that met these demanding requirements by utilizing the coherent nano-Cu-rich phases precipitated during aging. In the current investigation, the evolution of precipitation during the aging process of Cu-alloyed non-oriented silicon steel is revealed as: BCC Cu-rich cluster (Fe:Cu > 1) → B2 FeCu cluster (Fe:Cu approaches 1) → BCC Cu cluster (Fe:Cu 1.0/400 of 16.3–18.3 W kg−1, and B5000 of 1.641–1.656 T. © 2025

关键词： Silicon steel

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Recent advances in photopolymerization 3D printing of alumina-ceramic

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Progress in Natural Science:Materials International 2025年第1期35卷 1-30页

作者： M.Irfan Hussain Min Xia XiaoNa Ren Zhen Shen Muhammad Jamil Changchun Ge Institute of Powder Metallurgy and Advanced Ceramics School of Material Science and Engineering University of Science and Technology Beijing State Key Laboratory of Multimodal Artificial Intelligence Systems Beijing Engineering Research Center of Intelligent Systems and Technology Institute of AutomationChinese Academy of Sciences College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and Astronautics

Digital light processing(DLP) 3D printing has a huge potential for manufacturing intricate and customized ceramic parts with high precision and cost-effectiveness. Research in this field contributes to material innovation,opening the avenues for new process designs in both scientific and industrial sectors. However, the implementation of DLP 3D printing technology in ceramic research has not yet reached the maturity level as that in polymer and tissue engineering. Necessarily, a holistic in-depth literature reporting the successful integration of alumina ceramics within DLP 3D printing technology is urgently needed. This review, systematic examines recent progress in DLP technology, focusing on photopolymer resins that incorporate UV-sensitive monomers, photoinitiators, and dispersants, as well as their synergistic effects on achieving high-quality printing, desirable material properties, and enhanced performance. Further, the review discusses key factors including post-processing characteristics such as debinding and sintering, which influence microstructure, and defect formation including microcracks, porosity and voids. Finally, the challenges associated with printing and sintering are highlighted,aiming to identify focused focused development pathways and potential solution to optimize outcomes. This analysis clarifies existing challenges and also propsoes future applications for DLP technology in the aluminaceramic field.

关键词： Al2O3 ceramics Applications Digital light processing (DLP) Post-processing Resin

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Unraveling the significance of cobalt on transformation kinetics,crystallography and impact toughness in high-strength steels

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 380-390页

作者： Yishuang Yu Jingxiao Zhao Xuelin Wang Hui Guo Zhenjia Xie Chengjia Shang Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing 100083China School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China

This work reveals the significant effects of cobalt(Co)on the microstructure and impact toughness of as-quenched highstrength steels by experimental characterizations and thermo-kinetic *** results show that the Co-bearing steel exhibits finer blocks and a lower ductile-brittle transition temperature than the steel without ***,the Co-bearing steel reveals higher transformation rates at the intermediate stage with bainite volume fraction ranging from around 0.1 to *** improved impact toughness of the Co-bearing steel results from the higher dense block boundaries dominated by the V1/V2 variant ***,the addition of Co induces a larger transformation driving force and a lower bainite start temperature(BS),thereby contributing to the refinement of blocks and the increase of the V1/V2 variant *** findings would be instructive for the composition,microstructure design,and property optimization of high-strength steels.

关键词： high-strength steel cobalt transformation kinetics crystallography impact toughness

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Observation of tunable exceptional points in a non-Hermitian acoustic system

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Science China(Physics,Mechanics & Astronomy) 2025年第5期Mechanics & Astronomy) .卷 147-154页

作者： Chen Liu Zhongming Gu Haixiao Zhang Xiaowei Zhang Chuanhao Ge Tuo Liu Jie Zhu Institute of Acoustics School of Physics Science and Engineering Tongji University State Key Laboratory of Acoustics Institute of Acoustics Chinese Academy of Sciences School of Physics MOE Key Laboratory of Modern Acoustics Collaborative Innovation Center of Advanced MicrostructuresNanjing University School of Electrical and Information Engineering Changzhou Institute of Technology Key Laboratory of Speech Acoustics and Content Understanding Institute of Acoustics Chinese Academy of Sciences University of Chinese Academy of Sciences Key Laboratory of Noise and Vibration Research Institute of Acoustics Chinese Academy of Sciences

Exceptional points(EPs) have extensive and important applications in many wave-based technologies, such as ultra-sensitive sensing, unidirectional scattering and low-threshold laser. However, most of the previous EP-related wave phenomena are demonstrated in systems with fixed configuration, thereby extremely constraining their adaptability and reconfigurability in ***, we introduce a flexible approach to tuning EPs in an acoustic system with sandwich structures. A rotatable component,associated with an alterable gradient index, is clamped by a pair of lossy acoustic resonators. Theoretical derivations and numerical simulations validate the capabilities of the model in continuously regulating EPs in the parameter space, with ingenious experimental setups confirming these findings. The results showcase the system's effectiveness in achieving unidirectional reflectionless wave propagation across various frequencies. Our research reveals a flexible approach to linking the adjustment of EPs to a simple structural parameter, offering a robust framework for exploring and implementing non-Hermitian wave phenomena in practical scenarios.

关键词： asymmetric reflection tunable exceptional points non-Hermitian acoustic system

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Ultralight and superelastic MXene/reduced graphene oxide aerogels for electromagnetic interference shielding

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Nano Research 2025年第1期18卷 1-9页

作者： Xinfeng Zhou Yang Dai Guoyao Yue Yiman Zhang Lulu Li Zhong-Zhen Yu Peng Min Hao-Bin Zhang State Key Laboratory of Organic-Inorganic Composites College of Materials Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029China Beijing Key Laboratory of Advanced Functional Polymer Composites College of Materials Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029China Present address:BOE Technology Innovation Center BOE Technology Group Co.Ltd.Beijing 100176China Xi’an Modern Chemistry Research Institute Xi’an 710065China

Lightweight aerogels feature multifunctionality and a high porosity,yet accompanied with poor structure recovery under large strain *** this work,we develop an air bubble-ice crystal dual template and annealing strategy to integrate low density and high resilience for the conductive transition metal carbides/nitrides(MXene)composite *** air bubbles and ice crystals synergistically exclude the nanosheets to the gas-liquid interfaces,thereby constructing unique Y-shaped junctions and robust *** annealing process greatly enhances the interlayer *** external load,the Yshaped structures prevent the stress concentration at the junctions by transferring the forces to the skeleton for maintaining structural *** addition,the wrinkled and thick cell walls,together with the enhanced interlayer interactions,endow the aerogel with exceptional structural stability and *** a result,the MXene/reduced graphene oxide(RGO)composite aerogels exhibit superelasticity with reversible compressive strains of up to 95%.In addition,the electron bridging effect of the RGO sheets affords the aerogel to deliver excellent electromagnetic interference shielding performance,as high as 46.3 dB at 2.5 ***,the remarkable reshapeability of the aerogels allows for precise regulation of structure and performance(33.5-75.1 dB)by a simple wetting compression *** summary,this work offers helpful inspirations for developing lightweight and superelasticity aerogels for extensive applications.

关键词： lightweight superelasticity MXene aerogel electromagnetic interference shielding reshapeability

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