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Nitrogen-doped carbon-coated hollow SnS_(2)/NiS microflowers for high-performance lithium storage

Frontiers of materials science 2023年第3期17卷 119-129页

作者： Junhai Wang Jiandong Zheng Liping Gao Qingshan Dai Sang Woo Joo Jiarui Huang School of Material and Chemical Engineering Chuzhou UniversityChuzhou 239000China Key Laboratory of Functional Molecular Solids of the Ministry of Education College of Chemistry and Materials ScienceAnhui Normal UniversityWuhu 241002China School of Mechanical Engineering Yeungnam UniversityGyeongsanGyeongbuk 38541Republic of Korea

Nitrogen-doped carbon-coated hollow SnS_(2)/NiS(SnS_(2)/NiS@N–C)microflowers were obtained using NiSn(OH)6 nanospheres as the template via a solventthermal method followed by the polydopamine coating and carbonization *** served as an anode material for lithium-ion batteries,such hollow SnS_(2)/NiS@N–C microflowers exhibited a capacity of 403.5 mAh·g^(−1) at 2.0 A·g^(−1) over 200 cycles and good rate *** electrochemical reaction kinetics of this anode was analyzed,and the morphologies and structures of anode materials after the cycling test were *** high stability and good rate performance were mainly due to bimetallic synergy,hollow micro/nanostructure,and nitrogen-doped carbon *** revealed excellent electrochemical energy storage properties of hollow SnS_(2)/NiS@N–C microflowers in this study highlight their potential as the anode material.

关键词： SnS_(2) NiS microflower hollow structure nitrogen-doped carbon anode lithium-ion battery

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Constitutive model of viscoelastic dynamic damage for the material of gas obturator in modular-charge howitzer

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Defence Technology（防务技术） 2024年第9期39卷 203-216页

作者： Zhonggang Li Longmiao Chen Yifan Li Yufeng Jia Quan Zhang School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing 210094China Technology Center Shanxi North Machine-building Co.Ltd.Taiyuan 030009China Research and Development Department Kelong New Material Technology Co.Ltd.Xianyang 712000China

In order to investigate the mechanical response behavior of the gas obturator of the breech mechanism,made of polychloroprene rubber(PCR), uniaxial compression experiments were carried out by using a universal testing machine and a split Hopkinson pressure bar(SHPB), obtaining stress-strain responses at different temperatures and strain rates. The results revealed that, in comparison to other polymers, the gas obturator material exhibited inconspicuous strain softening and hardening effects;meanwhile, the mechanical response was more affected by the strain rate than by temperature. Subsequently, a succinct viscoelastic damage constitutive model was developed based on the ZWT model, including ten undetermined parameters, formulated with incorporating three parallel components to capture the viscoelastic response at high strain rate and further enhanced by integrating a three-parameter Weibull function to describe the damage. Compared to the ZWT model, the modified model could effectively describe the mechanical response behavior of the gas obturator material at high strain rates. This research laid a theoretical foundation for further investigation into the influence of chamber sealing issues on artillery firing.

关键词： Breech mechanism Gas obturator Polychloroprene rubber Constitutive model Strain rate Damage

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mechanical properties and microstructure evolution of austenitic stainless-steel sheets, deformed at sub-zero temperatures

Journal of Alloys and Metallurgical Systems

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Journal of Alloys and Metallurgical Systems 2025年 9卷

作者： Krishnam Raju, M. Mahajan, Peeyush Kumar, Pavan Narasimhan, K. Department of Metallurgical Engineering and Material Science IIT Bombay India Department of Mechanical Engineering IIT Bombay India

Stainless steels are better than carbon steels for structural applications due to their optimal blend of strength, ductility, and corrosion resistance. Austenitic stainless steels, such as AISI304, are extensively utilized in cryogenic applications owing to their remarkable formability and corrosion resistance, even at sub-zero temperatures. In this study, the deformation behaviour of austenitic stainless steel (AISI304) sheet of thickness 1.2 mm was examined through tensile testing at room temperature (25°C) and sub-zero temperatures (0ºC, −40ºC, −80ºC, −120ºC) at strain rates such as 0.01 s−1,0.001 s−1,0.0001 s−1. mechanical properties, microstructure, and texture evolution were analysed and interrelated across these temperature and strain rate conditions. Tensile strength exhibited an upward trend with decreasing temperature and strain rate, while yield strength decreased with decreasing strain rate and increased with lowering temperature. Microstructural changes indicated a phase transformation from parent austenite phase, with martensite fraction escalating alongside decreasing strain rate and temperature. Micro texture analysis revealed a rise in the fraction of the cube texture component corresponding to an increase in martensite fraction across materials deformed at varying temperatures and strain rates. This paper gives complete insight into the microstructure and the texture evolution during the uniaxial deformation of AISI 304 sheet at room temperature and at sub-zero temperatures. © 2024 The Authors

关键词： Austenitic stainless steel

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Uncovering Microstructure-Property Relationship in Ni-Alloyed Fe-Mn-Al-C Low-Density Steel Treated by Hot-Rolling and Air-Cooling Process

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Acta Metallurgica Sinica(English Letters) 2024年第4期37卷 713-725页

作者： Xiaoliang Jia Guhui Gao Xiaolu Gui Chun Feng R.D.K.Misra Bingzhe Bai School of Mechanical Electronicand Control EngineeringBeijing Jiaotong UniversityBeijing100044China CNPC Tubular Goods Research Institute Xi’an710077China Laboratory for Excellence in Advanced Steel Research University of Texas at El PasoEl PasoTX79968-0521USA School of Material Science and Engineering Key Laboratory of Advanced Materials of Ministry of EducationTsinghua UniversityBeijing100084China

This paper focuses on the relationship between the microstructure and tensile properties of Fe-Mn-Al-C low-density high-strength steel processes by hot-rolling and air-cooling process. The microstructure analysis reveals that the combination of hot-rolling and air-cooling results in the formation of heterogeneous structures comprising different-sized γ and B_(2) phases in the low-density steel with the addition of nickel (Ni). The addition of Ni promotes the formation of the B_(2) phase and induces the pinning of B_(2) phase particles at the γ grain boundaries. This pinning effect effectively hinders the growth of the γ grains, leading to grain refinement. The tensile test results demonstrate that LDS-5Ni (low-density steel, LDS) exhibits excellent high strength and ductility combination, e.g., a tensile strength of 1535 MPa, yield strength of 1482 MPa, and elongation of 23.3%. These remarkable mechanical properties are primarily attributed to the combined strengthening contributions of grain refinement and duplex nano-sized second-phase precipitation hardening.

关键词： Low-density steel Microstructure B_(2)phase κ-Carbide Tensile properties

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Self‑Assembly of Binderless MXene Aerogel for Multiple‑Scenario and Responsive Phase Change Composites with Ultrahigh Thermal Energy Storage Density and Exceptional Electromagnetic Interference Shielding

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Nano-Micro Letters 2024年第3期16卷 367-382页

作者： Chuanbiao Zhu Yurong Hao Hao Wu Mengni Chen Bingqing Quan Shuang Liu Xinpeng Hu Shilong Liu Qinghong Ji Xiang Lu Jinping Qu Key Laboratory of Material Chemistry for Energy Conversion and Storage of Ministry of Education School of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China Qingdao Mental Health Center Qingdao 266034People’s Republic of China Hubei Engineering Research Center for Biomaterials and Medical Protective Materials Huazhong University of Science and TechnologyWuhan 430074People’s Republic of China Hubei Key Laboratory of Material Chemistry and Service Failure School of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China National Engineering Research Center of Novel Equipment for Polymer Processing Key Laboratory of Polymer Processing Engineering(South China University of Technology)Ministry of EducationGuangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced ManufacturingSchool of Mechanical and Automotive EngineeringSouth China University of TechnologyGuangzhou 510641People’s Republic of China

The severe dependence of traditional phase change materials(PCMs)on the temperature-response and lattice deficiencies in versatility cannot satisfy demand for using such materials in complex application ***,we introduced metal ions to induce the self-assembly of MXene nanosheets and achieve their ordered arrangement by combining suction filtration and rapid ***,a series of MXene/K^(+)/paraffin wax(PW)phase change composites(PCCs)were obtained via vacuum impregnation in molten *** prepared MXene-based PCCs showed versatile applications from macroscale technologies,successfully transforming solar,electric,and magnetic energy into thermal energy stored as latent heat in the ***,due to the absence of binder in the MXene-based aerogel,MK3@PW exhibits a prime solar-thermal conversion efficiency(98.4%).Notably,MK3@PW can further convert the collected heat energy into electric energy through thermoelectric equipment and realize favorable solar-thermal-electric conversion(producing 206 mV of voltage with light radiation intensity of 200 mw cm^(−2)).An excellent Joule heat performance(reaching 105℃with an input voltage of 2.5 V)and responsive magnetic-thermal conversion behavior(a charging time of 11.8 s can achieve a thermal insulation effect of 285 s)for contactless thermotherapy were also demonstrated by the MK3@***,as a result of the ordered arrangement of MXene nanosheet self-assembly induced by potassium ions,MK3@PW PCC exhibits a higher electromagnetic shielding efficiency value(57.7 dB)than pure MXene aerogel/PW PCC(29.8 dB)with the same MXene *** work presents an opportunity for the multi-scene response and practical application of PCMs that satisfy demand of next-generation multifunctional PCCs.

关键词： Self-assembly Multiple-scenario Phase change composites Thermal energy storage Electromagnetic interference shielding

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Effect of shape of single-roll rapid solidification nozzles on properties of ribbons for magnesium rechargeable batteries

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Keikinzoku/Journal of Japan Institute of Light Metals 2025年第2期75卷 114-119页

作者： Kirimoto, Yuichi Tsukeda, Tadayoshi Aida, Tetsuo Tabata, Hironobu Haga, Toshio Kurihara, Hideki Suzuki, Mayumi Department of Nano and Functional Material Science Graduate School of Science and Engineering for Education University of Toyama 3190 Gofuku Toyama Toyama-shi930-8555 Japan Faculty of Sustainable Design Academic Assembly University of Toyama Toyama Toyama-shi Japan CHUETSU METAL WORKS CO. LTD. Nakaniikawa-gun Toyama Japan Department of Mechanical Engineering Osaka Institute of Technology Osaka Osaka-shi Japan Saitama Industrial Technology Center Saitama Saitama-shi Japan Department of Mechanical Systems Engineering Faculty of Engineering Toyama Prefectural University Toyama Imizu-shi Japan

In developing ribbons for use as anode materials in innovative rechargeable batteries, magnesium ribbons were manufactured using a single-roll rapid solidification method. The quality of ribbons, such as their surface characteristics and defects, was considered to be largely determined by the manufacturing conditions of single-roll rapid solidification method, and it was also reported that shape of nozzle used to spray molten magnesium also had a significant effect on the quality of ribbons. In this study, ribbons were produced using nozzles with various internal gradient angles, and the surface properties, cross-sectional structure, and internal and external defects of the ribbons were evaluated. In actual ribbon production, it was confirmed that a nozzle with a smaller gradient angle could produce ribbons with a stable yield of over 70%. This is because adding a gradient shape allows smooth molten metal to be sprayed out. In the microstructure observation of the ribbons, a network-like second phase was observed near the free-solidification surface. A difference in cell size was also confirmed with the change in nozzle shape. In addition, the relationship between cell size and hardness was investigated, and it was confirmed that the hardness value decreases as the cell size increases. © 2025 The Japan Institute of Light Metals.

关键词： Hardness

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Impact of Silicon Carbide Particle on the Behavior of Coir Fiber-Incorporated Polypropylene Hybrid Composite

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Journal of The Institution of Engineers (India): Series D 2024年 1-5页

作者： Aruna, M. Manivannan, S. Kumar, A. Vignesh Kumar, M. Chandramohan, P. Lakshmanan, S. Venkatesh, R. Department of Industrial Management Faculty of Business Liwa College Abu Dhabi United Arab Emirates Centre for Material Science Department of Mechanical Engineering Karpagam Academy of Higher Education Tamilnadu Coimbatore641021 India Department of Civil Engineering RVS Technical Campus Tamilnadu Coimbatore641402 India Department of Mechanical Engineering KCG College of Technology Tamilnadu Chennai600097 India Department of Mechatronics Rajalakshmi Engineering College Tamilnadu Chennai602105 India Department of Mechanical Engineering Vel Tech Multi Tech Dr Rangarajan Dr Sakunthala Engineering College Tamilnadu Avadi Chennai600062 India Saveetha University Tamilnadu Chennai602105 India

Chemical surface-treated natural fiber-fabricated composites are gaining excellence in many engineering domains, have low specific weights, and have increased specific behavior. However, natural fiber showed marginal improvement in hardness and wear behavior. The novel investigation is to fabricate the polypropylene hybrid nanocomposites by using 20 wt% of sodium hydroxide (NaOH) processed coir fiber in the form chopped, and this is blended with 0, 3, 6, and 9 wt% of silicon carbide nanoparticle (SiC) via injection technique. The impact of SiC appearances in polypropylene hybrid nanocomposite's tensile strength, microhardness, and wear behavior is studied, and its evaluated results are compared. Polypropylene hybrid nanocomposite fabricated by 20 wt% coir fiber with 9 wt% SiC is exposed in 59 ± 0.3 MPa of its tensile strength, and hardness is attained by 73 ± 0.5 HV. The wear rate is 0.31 mg/m on an applied load 20 N with a 1 m/sec sliding speed. © The Institution of Engineers (India) 2024.

关键词： Polypropylenes

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SnO_(2)nanotubes with N-doped carbon coating for advanced Li-ion battery anodes

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Frontiers of materials science 2023年第4期17卷 81-91页

作者： Junhai Wang Jiandong Zheng Liping Gao Chunyu Meng Jiarui Huang Sang Woo Joo School of Material and Chemical Engineering Chuzhou UniversityChuzhou 239000China Key Laboratory of Functional Molecular Solids of the Ministry of Education College of Chemistry and Materials ScienceAnhui Normal UniversityWuhu 241002China School of Mechanical Engineering Yeungnam UniversityGyeongsanGyeongbuk 38541Republic of Korea

Tin dioxide nanotubes with N-doped carbon layer(SnO_(2)/N-C NTs)were synthesized through a MoO3 nanorod-based sacrificial template method,dopamine polymerization and calcination *** to the Li-ion battery,SnO_(2)/N-C NTs exhibited excellent electrochemical properties,with a first discharge capacity of 1722.3 mAh·g^(−1)at 0.1 A·g^(−1)and a high capacity of 1369.3 mAh·g^(−1)over 100 *** superior electrochemical performance is ascribed to the N-doped carbon layer and tubular structure,which effectively improves the electrical conductivity of the composites,accelerates the migration of Li+and electrons,and alleviates the volume change of the anode to a certain extent.

关键词： SnO_(2) nanotubes N-doped carbon anode Li-ion battery

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On the Meso-structure Spatial Variability Characterizing and Geometric Modelling of Textile-Based Composite via Volume Imaging 23

On the Meso-structure Spatial Variability Characterizing and...

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23rd International Conference on Composite materials, ICCM 2023

作者： Yang, Bin Wang, Jihui Causse, Philippe Béguin, Cédric Trochu, François Department of Mechanical Engineering Polytechnique Montréal Canada School of Material Science and Engineering Wuhan University of Technology China Department of System Engineering École de Technologie Supérieure Canada

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0906 | Experimental Investigation of Increased Bearing Capacity When Imparting Vibration to Loose Ground in Low Atmospheric Pressure 21

0906 | Experimental Investigation of Increased Bearing Capac...

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21st International and 12th Asia-Pacific Regional Conference of the International Society for Terrain-Vehicle Systems, ISTVS 2024

作者： Watanabe, Tomohiro Iizuka, Kojiro Department of Engineering Mechanical Engineering Program Niigata University Niigata Prefecture Niigata City Japan Department of Science and Engineering Machinery and Control Systems Shibaura Institute of Technology Saitama Prefecture Saitama City Japan

ISBN: (纸本)9781942112570

Recently, legged robots have attracted considerable attention as highly mobile rovers for planetary exploration. However, the surfaces of celestial bodies such as Mars and the Moon are primarily loose, causing slippage due to surface deformation from the rover's leg movements. To mitigate this, a walking method aimed at preventing slippage was proposed. In this walking method, the bearing capacity is increased by imparting vibration from the rover's leg to the loose soil on the ground. This walking method improved the mobility performance of the legged rover. It is crucial to investigate the increase in bearing capacity by imparting vibration in a realistic space environment to validate the effectiveness of the proposed method. This study examines the change in bearing capacity due to vibration under low atmospheric pressure, a condition found on Mars and the Moon. This condition affects the characteristics of ground sand due to decreased air resistance. Our findings provide valuable insights into using vibration in planetary exploration to enhance the performance of legged rovers. The experimental results indicate that the bearing capacity under low atmospheric pressure is nearly identical to that under standard atmospheric pressure, suggesting that atmospheric pressure conditions have minimal impact on the bearing capacity when vibration is applied. © 2024 International Society for Terrain-Vehicle Systems. All rights reserved.

关键词： Atmospheric pressure

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