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SSRN 2023年

作者： Hu, Yong Jia, Huibin Zhang, Xu Liu, Bo Xu, Jiayu Yang, Xiaokang Gao, Yubi Ding, Yutian Zhang, Dong School of Material Science and Engineering Lanzhou University of Technology Gansu Lanzhou730050 China State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of Technology Gansu Lanzhou730050 China State Key Laboratory of Nickel and Cobalt Resources Comprehensive Utilization Gansu Jinchang737100 China

Developing and designing heat treatment regimes suitable for L-PBF technology has become a research hot spot in the field of AM, based on the specific service conditions for preparing alloys. To achieve this goal, the present study selects the IN738LC alloy produced by L-PBF as the subject and then uses multiple characterization methods and quantitative analysis to meticulously examine the microstructure alterations of this alloy at 1250°C during various solution treatment duration (1 hour, 3 hours, 5 hours), examines the delayed re-crystallization behavior of the alloy, explores the selective precipitation pattern of M23C6 carbides on various types of grain boundaries during the recrystallization process, and clarifies the mechanism of tensile deformation of the alloy before and after heat treatment. It was showed that at 1250 °C/1 h, the nanoscale carbides at the boundaries of the cellular structure grew up, and the micro-segregation of Nb and Ti was removed. Due to carbide particle pinning and solute atom segregation dragging, grain boundary migration and transformation were hindered during the initial stage of solid solution treatment, resulting in delayed recrystallization and mainly recovery for the alloy. The alloy underwent recrystallization at 1250°C/5 h, resulting in the selective precipitation of M23C6 carbides at the twin boundaries. The mechanical property tests demonstrate that the samples made at 1250°C/1 h have the highest yield strength (σYS=1305±21 MPa) and tensile strength (σUTS=1462±11 MPa) due to the precipitation of the γ′ phase. Simultaneously, the presence of a considerable number of subgrain boundaries ensures a certain plasticity (ΕEL=5.4±0.7%). The tensile deformation mechanism indicates that the as-built IN738LC alloy mainly deforms through planar slip of dislocations, while the heat-treated samples deform through stacking faults shearing and anti-phase boundaries (APB) shearing at varying times. The APB cutting mechanism is more readily

关键词： Recrystallization (metallurgy)

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Matching Cp@Ncoh/Nf Cathode and Gh/Fnp/Nf Anode for High-Performance Asymmetric Supercapacitor

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SSRN 2022年

作者： Meng, Haoyan Wang, Shilong Ma, Xueying Zhang, Dehao Zhang, Linlin Liu, Xuying Zhang, Li School of Materials Science and Engineering Zhengzhou University Zhengzhou450001 China The Key Laboratory of Material Processing Mold of Ministry of Education Henan Key Laboratory of Advanced Nylon Materials and Application School of Materials Science and Engineering Zhengzhou University Zhengzhou450001 China

It is extremely crucial to design and match high-quality cathode and anode for achieving high-performance asymmetric supercapacitors (ASCs). Herein, Co3(PO4)2@NiCo-LDH/Ni foam (CP@NCOH/NF) cathode with hierarchical morphology and graphene hydrogel/Fe-Ni phosphide/Ni foam (GH/FNP/NF) anode with the robust and porous structure were elaborately designed and prepared respectively. Owing to their unique and profitable structures, both CP@NCOH/NF and GH/FNP/NF electrodes yield the superior capacity (10760 and 2236 mC cm-2 at 2 mA cm-2, respectively), good rate capability (63% retention at 200 mA cm-2 and 52% retention at 50 mA cm-2, respectively), and excellent cycling stability (72% and 74% retention after 10000 cycles, respectively). Benefiting from their matchable electrochemical performances, the configured solid-state CP@NCOH/NF//GH/FNP/NF ASC outputs both competitive energy density (80.2 Wh kg-1/4.1 mWh cm-3) and power density (14563 W kg-1/750 mW cm-3), companied by remarkable cyclability (73% retention after 10000 cycles), manifesting its great promise for large-scale integrated energy-storage system. © 2022, The Authors. All rights reserved.

关键词： Cathodes

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Nitrogen and phosphorous co-doped hierarchical meso–microporous carbon nanospheres with extraordinary lithium storage for highperformance lithium-ion capacitors

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Science China materials 2022年第9期65卷 2363-2372页

作者： Tong Li Jianjun Zhang Chongxing Li Han Zhao Jing Zhang Zhao Qian Longwei Yin Rutao Wang Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of EducationSchool of Materials Science and EngineeringShandong UniversityJinan 250061China Shandong Key Laboratory for Special Silicon-containing Material Advanced Materials InstituteQilu University of Technology(Shandong Academy of Sciences)Jinan 250014China Suzhou Institute of Shandong University Suzhou 215123China CAS Key Laboratory of Carbon Materials Institute of Coal ChemistryChinese Academy of SciencesTaiyuan 030001China

Lithium-ion capacitors(LICs),consisting of a battery-like negative electrode and a capacitive porous-carbon positive electrode,deliver more than twice the energy density of electric double-layer ***,their wide application suffers from low energy density and reduced cycle life at high ***,hierarchical meso±microporous carbon nanospheres with a highly disordered structure and nitrogen/phosphorous co-doped properties were synthesized through a facile template *** hierarchical porous structure facilitates rapid ion transport,and the highly disordered structure and high heteroatom content provide abundant active sites for Li+charge *** experiments demonstrated that the carbon nanosphere anode delivers large reversible capability,greatly improves rate capability and exhibits excellent cycle *** LIC fabricated with the carbon nanosphere anode and an activated carbon cathode yields a high energy density of 103 W h kg^(-1),an extremely high power density of 44,630 W kg^(-1),and longterm cyclability of over 10,000 *** work presents how structural control of carbon materials at the nano/atomic scale can significantly enhance electrochemical performance,enabling new opportunities for the design of high-performance energy-storage devices.

关键词： lithium-ion capacitors porous carbon anode heteroatoms doping energy storage devices

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Controllable Preparation of Zeolite-P/Calcined Diatomite with Mgcl2

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SSRN 2023年

作者： Guo, Zhengzheng Ren, Zijie Gao, Huimin Guan, Junfang Li, Peryue Zheng, Renji Yin, Hang School of Resources and Environment Engineering Wuhan University of Technology Wuhan430070 China Hubei Key Laboratory of Mineral Resources Processing and Environment Wuhan430070 China State Key Laboratory of Advanced Technology for Float Glass China School of Minerals Processing and Bioengineering Central South University Changsha410083 China China Energy Green Building Material CO. LT Wuhan430070 China

Calcination is a critical technique for preparing diatomite filter aids, which enhances their permeability and whiteness. However, calcination is accompanied by a severe reduction in the adsorption capacity of calcined diatomite (C-D). Applications such as high-end filter aids and fine adsorbents typically require C-D with high adsorption performance. So, it is imperative to modify and design C-D for superior adsorption performance while maintaining its permeability. In this study, C-D was modified using sodium hydroxide (NaOH) and magnesium chloride (MgCl2) via a hydrothermal process, and the mechanism of modification was investigated. The resulting Zeolite-P/C-D (modified calcined diatomite, M-D) exhibited not only a high adsorption capacity, but also displayed admissible permeability. Compared with C-D, the adsorption capacity of M-D had increased by dozens of times, and the permeability of M-D remained about 1 darcy. XRD, SEM, TEM, and FTIR analyses revealed the synthesis of Zeolite-P on the surface of C-D. The structure and morphology characteristics of Zeolite-P could be controlled by adjusting the amount of MgCl2, resulting in M-D samples with varying adsorption capacities and permeabilities. This study presents a simple and environmentally friendly approach for modifying C-D, thereby improving the adsorption performance of diatomite filter aids. It paves a way for the comprehensive and efficient utilization of diatomite resources. © 2023, The Authors. All rights reserved.

关键词： Magnesium compounds

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Hierarchical microstructure and two-stage corrosion behavior of a high-performance near-eutectic Zn-Li alloy

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Journal of materials Science & Technology 2021年第21期80卷 50-65页

作者： Zhen Li Zhang-Zhi Shi Hai-Jun Zhang Hua-Fang Li Yun Feng Lu-Ning Wang Beijing Advanced Innovation Center for Materials Genome Engineering School of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing100083China Beijing Laboratory of Metallic Materials and Processing for Modern Transportation University of Science and Technology BeijingBeijing100083China Department of Interventional and Vascular Surgery The Tenth People's Hospital of ShanghaiTongji UniversityShanghai200072China National United Engineering Laboratory for Biomedical Material Modification Branden Industrial ParkQihe Economic&Development ZoneDezhou CityShandongDezhou251100China Ophthalmology Department Peking University Third HospitalPeking UniversityBeijing100083China

In order to improve mechanical and corrosion properties of biodegradable pure Zn,a knowledge-based microstructure design is performed on Zn-Li alloy system composed of hard β-LiZn_(4) and soft Zn *** and multi-modal grain structure are designed to toughen β-LiZn_(4) while strengthen Zn,resulting in high strength and high ductility for both the ***-like secondary Zn precipitates form in β-LiZn4,while fine-scale networks of string-like β-LiZn4 precipitates form in Zn with a tri-modal grain *** a result,near-eutectic Zn-0.48 Li alloy with an outstanding combination of high strength and high ductility has been fabricated through hot-warm rolling,a novel fabrication process to realize the microstructure *** as-rolled alloy has yield strength(YS) of 246 MPa,the ultimate tensile strength(UTS) of 395 MPa and elongation to failure(EL) of 47 %.Immersion test in simulated body fluid(SBF) for 30 days reveals that Li-rich products form preferentially at initial stage,followed by Zn-rich products with prolonged *** insoluble Li_(2) CO_(3) forms a protective passivation film on the alloy surface,which suppresses the average corrosion rate from 81.2 μm/year at day one down dramatically to 18.2 μm/year at day ***,the average corrosion rate increases slightly with decrease of Li2 CO_(3) content,which undulates around the clinical requirements on corrosion resistance(i.e.,20 μm/year) claimed for biodegradable metal stents.

关键词： Zn alloy Microstructure design Mechanical properties Interfacial structure Corrosion passivation

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Sulfur-doped g-C3N4/TiO2 S-scheme heterojunction photocatalyst for Congo Red photodegradation

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Chinese Journal of Catalysis 2021年第1期42卷 56-68页

作者： Juan Wang Guohong Wang Bei Cheng Jiaguo Yu Jiajie Fan Hubei Key Laboratory of Pollutant Analysis and Reuse Technology College of Chemistry and Chemical EngineeringInstitute for Advanced MaterialsHubei Normal UniversityHuangshi 435002HubeiChina State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070HubeiChina Material Science and Engineering School Zhengzhou UniversityZhengzhou 450001HenanChina

Constructing step-scheme(S-scheme)heterojunctions has been confirmed as a promising strategy for enhancing the photocatalytic activity of composite *** this work,a series of sulfur-doped g-C3N4(SCN)/TiO2 S-scheme photocatalysts were synthesized using electrospinning and calcination *** as-prepared SCN/TiO2 composites showed superior photocatalytic performance than pure TiO2 and SCN in the photocatalytic degradation of Congo Red(CR)aqueous *** significant enhancement in photocatalytic activity benefited not only from the 1D well-distributed nanostructure,but also from the S-scheme ***,the XPS analyses and DFT calculations demonstrated that electrons were transferred from SCN to TiO2 across the interface of the SCN/TiO2 *** built-in electric field,band edge bending,and Coulomb interaction synergistically facilitated the recombination of relatively useless electrons and holes in hybrid when the interface was irradiated by simulated solar ***,the remaining electrons and holes with higher reducibility and oxidizability endowed the composite with supreme redox *** results were adequately verified by radical trapping experiments,ESR tests,and in situ XPS analyses,suggesting that the electron immigration in the photocatalyst followed the S-scheme heterojunction *** work can enrich our knowledge of the design and fabrication of novel S-scheme heterojunction photocatalysts and provide a promising strategy for solving environmental pollution in the future.

关键词： TiO2 nanofiber Sulfur-doped g-C3N4 Step-scheme heterojunction photocatalysis In situ XPS S-scheme mechanism

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Strategy to consider element distribution when constructing training datasets for developing machine learning potentials of alloys based on a Monte-Carlo-like method

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Physical Review B 2022年第9期106卷 094107-094107页

作者： Zhipeng Zhang Liuqing Chen Junyi Guo Xianyin Duan Bin Shan Xianbao Duan Hubei Key Laboratory of Plasma Chemistry and Advanced Materials and School of Materials Science and Engineering Wuhan Institute of Technology Wuhan 430205 Hubei China Hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering Wuhan University of Science and Technology Wuhan 430081 Hubei China State Key Laboratory of Material Processing and Die and Mould Technology and School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan 430074 Hubei China

Molecular dynamics simulations can explore the characteristics and evolution of microstructures in alloys outside of experiments, with reliability and accuracy guaranteed by the interatomic potentials employed. Machine learning potential (MLP) is widely used for its accuracy close to first-principles calculations. When developing an MLP, the construction of the training dataset is crucial, determining the accuracy and generalization of the MLP. In this work, a Monte-Carlo-like (MCL) strategy is proposed to construct training datasets for developing MLPs of alloys, which is characterized by the efficient consideration of element distributions in alloys. As an example, a training dataset for the equimolar NbTiZrHf alloy is constructed based on the MCL strategy, and the corresponding MLP is developed subsequently. By comparing with two traditional strategies, it is found that the training dataset constructed based on the MCL strategy has greater dispersion, and the corresponding MLP has better prediction performance. In addition, a hybrid molecular statics and Monte Carlo simulation with the MCL-based MLP is performed to optimize the element distribution of the equimolar NbTiZrHf alloy, and segregation and short-range ordered structures are observed in the final configuration, which is consistent with the experimental results reported in the literature. The MCL strategy proposed in this work can provide a fast solution for considering the element distribution when constructing training datasets for developing MLPs of alloys.

关键词： First-principles calculations Interatomic & molecular potentials Alloys Machine learning Molecular dynamics Monte Carlo methods

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Effect of pH, milling time, and Isobam content on porous silicon nitride ceramics prepared by gel casting

Advanced Powder Materials

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advanced Powder materials 2023年第1期2卷 100-107页

作者： Hailing Yang Zhi Wang Mengyong Sun Fei Chen Jun Ji Sique Chen Yingying Chen Deli Ma Zhenyu Zhang Baocai Pan Yulin Wei Qinggang Li Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials University of JinanJinan 250022China School of Material Science and Engineering University of JinanJinan 250022China No.52 Institute of China North Industry Group Yantai 264003China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

As a non-toxic copolymer of isobutylene and maleic anhydride,Isobam is successfully used as a dispersant and a gelling agent for fabricating porous Si_(3)N_(4) ceramics by gel *** dispersity and rheological properties of the Si_(3)N_(4) slurry are influenced by the pH,milling time,and Isobam content which varies from 0.1 wt.%to 0.6 wt.%,and these factors are *** slurry with 40 vol.%solid content and milled for 4 h has a high zeta potential at pH 12(adjusted by Tetramethyl ammonium hydroxide(TMAH)),which means that the particles are well *** mechanisms of TMAH are electrostatic repulsion and steric *** viscosity of the slurry increases with the increase of Isobam *** pressureless sintering at 1700℃ for 2 h,a uniform unique interlocking microstructure of rod-like β-Si_(3)N_(4) grains is observed,which may improve the flexural strength of the ceramics by intergranular fracture and particle pullout of β-Si_(3)N_(4) *** density and porosity of the samples fluctuate negligibly with the increase of Isobam content,and the Si_(3)N_(4) ceramic with 0.1 wt.% Isobam exhibits the highest bending strength of 251.6 MPa among all samples.

关键词： Si_(3)N_(4)ceramics Viscosity Zeta potential Gel casting Isobam

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Environmentally Adaptable Hydrogel Electrolyte with the Triple Interpenetrating Network in the Flexible Zinc-Ion Battery with Ultralong Stability

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SSRN 2022年

作者： Zhang, Linlin Jia, Caoer Zhang, Xiaosheng Liang, Shuaijie Fu, Yancheng Liu, Wentao Chen, Jinzhou Liu, Xuying The Key Laboratory of Material Processing Mold of Ministry of Education Henan Key Laboratory of Advanced Nylon Materials and Application School of Materials Science and Engineering Zhengzhou University Zhengzhou450001 China College of Chemistry Nankai University Tianjin300071 China

With the increasing development of wearable electronic devices, the electrochemical stabilities in flexible battery system are in great demand. However, the rapid capacity degradation derived from the parasitic side reactions of zinc anode and the poor ionic conductivity of traditional aqueous electrolyte in cold environmental still retards their practical application. Herein, a polyacryamide/carboxymethyl cellulose/gelatin (PCG) hydrogel electrolyte with triple interpenetrating network was fabricated by an interated physical crosslinking and free-radical polymerization process. Benefitting from its hierarchical porous structure, the PCG hydrogel electrolyte exhibits the stable mechanical compression deformation. The integrated cross-linked networks with abundant hydrogen bonds and high electrolyte salt prevent the crystallization of water, contributing to broadening its operating temperature from -20oC to room temperature. Therefore, the PCG electrolyte cannot only promise the highly reversible Zn2+ insertion/extraction, but also accelerate ion transfer in electrochemical process. As a result, the PCG-based ZIBs with magnesium vanadium oxide delivers a high capacity of 382.7 mAh g-1 and good cycling stability (10000 cycles at 0oC). Besides, the assembled flexible ZIBs also exhibits a good capacity retention under various bending states. This unique strategy of hydrogel electrolyte provides new insights for flexible ZIBs with superior cycling stability. © 2022, The Authors. All rights reserved.

关键词： Free radicals

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Innovations in 3D printing of magnesium alloys and composites for biodegradable biomedical devices

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Bioprinting 2025年 46卷

作者： Nair, Aditya Gupta, Shruti Jangitwar, Aboli Kandasubramanian, Balasubramanian Department of Fibres and Textile Processing Technology Institute of Chemical Technology Mumbai 400019 India Additive Manufacturing Laboratory Department of Metallurgical and Material Engineering Defence Institute of Advanced Technology (DU) Girinagar Pune 411025 India Department of Metallurgy and Materials Technology COEP Technological University Shivajinagar Pune 411005 India

Magnesium is among the plentiful minerals present in natural sources, serving as a crucial macronutrient for the human body, with numerous studies validating its distinctive traits such as remarkable biocompatibility within the human system, diminished stress shielding, and proficient physical and chemical characteristics. These attributes are pivotal elements when employing the mineral in alloys and composites for the fabrication of biomedical components. One particular application involves the utilization of magnesium-based alloys and composites in the creation of coronary stents and bone implants. The ability to manufacture magnesium-based biomedical components with precision and reduced material wastage through additive manufacturing methods has prompted a transition away from the conventional manufacturing processes presently in use. This review aims to offer a thorough assessment of the application of additive manufacturing in producing magnesium alloys and composites for biomedical purposes. The paper comprises a comparative examination of the fabrication methods presently employed for the production of these alloys and composites, with a particular emphasis on various additive manufacturing techniques. Furthermore, it delves into the surface modification of additively manufactured implants, which has shown considerable improvements in biocompatibility and corrosion resistance, which are crucial parameters in the realm of biomedicine. © 2025 Elsevier B.V.

关键词： 3D printing Additive manufacturing Biomedical Magnesium alloys Magnesium composites Surface modification

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