检索结果-内蒙古大学图书馆

Effect of Sodium Chloride on Enhanced Performance of Chitosan-Based Ion Actuator

Journal of Harbin Institute of Technology(New Series) 2024年第6期31卷 24-36页

作者： Zhaoyang Cui Xiaoli Zhao Weikun Jia Yueming Ren Yan Xu Yanzhuo Lv College of Material Science and Chemical Engineering Harbin Engineering UniversityHarbin 150001China College of Mechanical and Electrical Engineering Harbin Engineering UniversityHarbin 150001China

In this work, an actuate membrane and an electrode membrane were prepared by a sol-gel method. And then, they were physically pressed to form a chitosan-based ion actuator(CSIA). Importantly, the effect of sodium chloride on CSIA was *** mechanical properties of CSIA were tested by establishing an output force test platform and a displacement test platform while testing its porosity. And, the electrochemical performance was tested by electrochemical workstation. At the end, the surface morphology and functional groups were measured by scanning electron microscopy and infrared spectrogram, respectively. The results indicated that the molar concentration of the sodium chloride was the best at 0.06836 mol·L^(-1) for CSIA. Its mechanical properties could reach an output force of 2.939 mN and a deflection displacement of 4.025 mm, and the maximum porosity of 12.98 % at the same time. The specific capacitance of the electrochemical performance was up to 0.07719 F·g^(-1), and the minimum resistance reached 13.48 Ω. From the surface morphology and functional groups, the appropriate doping ratio of NaCl into CSIA was helpful for increasing the transport space of internal ions. The effective internal ion concentration and significantly reduced internal stress provided excellent performances under the appropriate voltage conditions. The doping of inorganic ion sodium chloride improved the internal electron transport efficiency of chitosan ion actuator, and it advanced the mechanical properties of the actuator. Hence the enhancement of NaCl output force in CSIA had a good significance for the development of inorganic salt ion strengthened ion actuator.

关键词： sodium chloride chitosan doped ion actuator

来源：评论

学校读者我要写书评

暂无评论

Interfacial reactions in the Sn-9.0 wt.% Zn/Cu-Ti alloy (C1990 HP) couple

引用

Soldering and Surface Mount Technology 2024年第1期36卷 30-38页

作者： Laksono, Andromeda Dwi Chen, Chih-Ming Yen, Yee-Wen Department of Materials Science and Engineering National Taiwan University of Science and Technology Taipei Taiwan Department of Chemical Engineering National Chung Hsing University Taichung Taiwan Study Program of Material and Metallurgical Engineering Institut Teknologi Kalimantan Balikpapan Indonesia

Purpose: The purpose of this study was to examine the influence of adding a small amount of Ti to a Cu-based alloy, specifically the commercial Hyper Titanium Copper alloy (C1990 HP), which contains Cu-3.28 wt.% Ti, on its interfacial reaction with Sn-9.0 wt.% Zn (SnZn) solder, using the liquid/solid reaction couple technique. Design/methodology/approach: The SnZn/C1990 HP couples were subjected to a reaction temperature of 240–270°C for a duration of 0.5–5 h. The resulting reaction couple was characterized using a scanning electron microscope, energy dispersive spectrometer, electron probe microanalyzer and X-ray diffractometer. Findings: It was observed that the scallop-shaped CuZn5 and planar Cu5Zn8 phases were formed in almost all SnZn/C1990 HP couples. With increased reaction duration and temperature, the Cu-rich intermetallic compound (IMC)-Cu5Zn8 phase became a dominant IMC formed at the interface. The total thickness of the IMCs was increased with the increase in the reaction duration and temperature. The IMC growth obeyed the parabolic law, and the IMC growth mechanism was diffusion controlled. The activation energy of the SnZn/C1990 HP couple was 64.71 kJ/mol. Originality/value: This article presents an analysis of the IMC thickness in each sample using ImageJ software, followed by kinetic analysis using Origin software at various reaction temperatures of SnZn/C1990 HP in liquid/solid couples. The study also includes detailed reports on the morphology, interface composition and X-ray diffraction analysis, as well as the activation energy. The findings can serve as a valuable reference for electronic packaging companies that utilize C1990 HP substrates. © 2023, Emerald Publishing Limited.

关键词： Binary alloys

来源：评论

学校读者我要写书评

暂无评论

Influence of Al foil interlayer on performance of vacuum diffusion bonding joint of 6061 aluminium alloy

引用

Journal of Iron and Steel Research International 2024年第10期31卷 2404-2412页

作者： Da-shuang Liu Jian-hua Xu Xiong-hui Li Ping Wei Yun Liang Jian Qin Hua-wei Sun Tian-ran Ding Zong-ye Ding Su-juan Zhong Lei Zhang Wei-min Long School of Material Science and Engineering Hefei University of TechnologyHefei230009AnhuiChina School of Material Science and Engineering Jiangsu University of Science and TechnologyZhenjiang212003JiangsuChina Zhengzhou Research Institute of Mechanical Engineering Co. Ltd.Zhengzhou450001HenanChina Ningbo Intelligent Machine Tool Research Institute Co. Ltd.of China National Machinery Institute GroupNingbo315700ZhejiangChina

The vacuum diffusion bonding method was used to introduce Al foil as the middle layer,and 6061 aluminium alloy was vacuum diffusion bonding *** typical microstructure characteristics and mechanical properties of 6061/Al/6061 welded joints were studied in detail,the effects of process parameters and Al intermediate layer on the microstructure and mechanical properties were revealed,and the diffusion bonding mechanism of 6061/Al/6061 welded joints was *** foil middle layer welded joint had the best performance at the temperature of 540℃,the holding time of 120 min,and the welding pressure of 4 *** bonding ratio is 95.91%,the shear strength is 79 MPa,and the deformation rate is 8.05%,and the introduction of Al intermediate layer improves the element distribution and microstructure,so that the bonding ratio of the welded joint is increased by 10.86%,the shear strength is increased by 5.55 MPa,and the deformation rate is reduced by 1.58%.The fracture morphology has typical ductile fracture characteristics.

关键词： 6061 aluminium alloy Diffusion bonding Interlayer Joint performance Elemental diffusion

来源：评论

学校读者我要写书评

暂无评论

Approach Based on Response-Surface Method to Optimize Lining of Dies Used in 3D Free-Bending Forming Technology

引用

Chinese Journal of mechanical engineering 2024年第5期37卷 307-331页

作者： Cheng Cheng Jiaxin Guo Ali Abd El‑Aty Jie Tao Xunzhong Guo College of Material Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 211100China Avic Taiyuan Aero-Instruments Co. LtdTaiyuan 030000China Department of Mechanical Engineering College of EngineeringAl Kharj Prince Sattam Bin Abdulaziz UniversityAl Kharj 11942Saudi Arabia Mechanical Engineering Department Faculty of EngineeringHelwan UniversityCairo 11795Egypt

In three-dimensional free-bending forming(3D-FBF),the tube is not overly constrained,and the plastic deformation behavior and forming quality of the bent tube are significantly affected by the critical structure of the forming die ***,the effects of die-lining structural parameters on the tube quality,and a method to determine the combination of die-lining structural parameters is yet to be *** study aims to propose a new framework that allows one to understand the effects of various die-lining structural parameters on tube quality and to propose the best combination of die-lining structural ***,finite-element modeling is performed to simulate 3D-FBF and examine the effects of individual die-lining structures on the quality of tube *** simulation results show that the deformation-zone length and die gap are positively correlated with the tube-section distortion and wall-thickness variation,whereas it shows an opposite trend with respect to the bending ***,the lining chamfer radius of the bending die and the guide lining chamfer radius minimally affect the tube forming ***,the optimal die-lining structure is obtained using the response-surface *** tube cross-sectional distortion rate reduced from 2.73 to 2.53%after the die lining is ***,the average inner-wall thickness reduced to 1.06 mm,whereas the average outer-wall thickness increased to 0.97 *** paper proposes a method for optimizing the forming-die-lining mechanism and for improving the tube forming quality in 3D-FBF.

关键词： Die lining Forming quality Response surface method Cross-sectional distortion Wall thickness

来源：评论

学校读者我要写书评

暂无评论

Enhanced low cycle fatigue properties of selective laser melting Ti-6Al-4V with fine-tuned composition and optimized microstructure

引用

Journal of materials science & Technology 2024年第13期180卷 129-140页

作者： Yuqi He Fengying Zhang Yuhong Dai Kexin Zhao Zimeng Ye Zerong Yu Chao Xia Hua Tan School of Material Science and Engineering Chang'an UniversityXi'an 710064China State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi'an 710072China School of Mechanical and Automotive Engineering South China University of TechnologyGuangzhou 510641China

Improving the low-cycle fatigue(LCF)properties of additively manufactured Ti-5.6Al-3.8V alloy is critical in ensuring its service safety and represents a significant research *** work discusses a so-lution that optimizes the alloy's microstructure and ductility by precisely controlling the over-saturated strengthening elements and heat *** was accomplished using selective laser melting(SLM),heat treatment at 800 ℃ for 2 h,and furnace cooling on a Ti-5.6Al-3.8V alloy with tightly controlled Al,V,and O concentrations in a lower *** results showed that the SLM-fabricated Ti-5.6Al-3.8V alloy,post-heat treatment,exhibited α laths with a width of~1.4 μm and β columnar grains with a diameter of~126 μm,without experiencing coarsening or variant selection *** alloy bal-anced strength and ductility post-heat treatment with a UTS of 1015 MPa and an EL of 16.5%relative to the as-deposited state(UTS of 1199 MPa and EL of 11.9%).Notably,the LCF properties of the heat-treated SLM Ti-5.6Al-3.8V alloy are superior to those of other Ti-6Al-4V alloys produced by additive manu-facturing and comparable to traditional *** high strain amplitudes(1-1.5%),the fatigue life of this alloy was twice that of the Ti-6Al-4V ***,we comprehensively analyzed the mi-crostructure,strength,and ductility of the SLM Ti-5.6Al-3.8V alloy to elucidate the factors influencing its LCF *** findings provide a solid foundation for improving the LCF properties of additively manufactured Ti-6Al-4V alloy,thereby contributing to its safe and reliable use in critical applications.

关键词： Additive manufacturing Selective laser melting Titanium alloy Low cycle fatigue Microstructure

来源：评论

学校读者我要写书评

暂无评论

Modelling and industrial experiment on the dynamic deviation of rolling force during high precision rolling process

引用

Alexandria engineering Journal 2025年 110卷 37-52页

作者： Chen, Shanshan Liu, Chundong Lin, Shuilin Key Laboratory for Microstructural Material Physics of Hebei Province School of Science Yanshan University Qinhuangdao China School of Mechanical Engineering Hebei University of Architecture Zhangjiakou China Key Laboratory of High Efficiency and Clean Mechanical Manufacture School of Mechanical Engineering Shandong University Jinan China

The dynamic deviation of rolling force during the rolling process is influenced by various coupling factors, including mill stiffness on the operating and driving sides, initial strip specifications, and roll crossing. These factors frequently lead to sickle bending of the strip and bearing wear. Although this dynamic deviation is crucial in the rolling process, the existing literature falls short in studying the mechanism of this deviation, both theoretically and experimentally. As a result, operators in industrial plants predominantly rely on experience to assess it and are unable to formulate specific adjustment plans. In this work, physical and mathematical models of rolling force deviation are developed to elucidate the underlying formation mechanism, taking into account the contact deformation of the roll system, plastic deformation of the strip and roll crossing models. Analysis of production data reveals that the dynamic deviation of rolling force exhibits three distinct fluctuation patterns: positive deviation, negative deviation, and alternating positive and negative deviation. Numerical simulations and industrial experiments are conducted to investigate the influencing factors and evolution rules of rolling force deviation under various rolling conditions. The results indicate that dynamic deviation increases with the growth of centreline deviation and wedge amount of strip, and exhibits a complex fluctuation pattern as the crossover angle increases. This is confirmed by both numerical simulations and experimental results. Based on these analytical results, several improvement methods have been implemented in industrial plants to reduce the dynamic deviation of rolling force. These include reducing stiffness deviation on both sides of the mill, narrowing the bearing housing clearance, and ensuring mill symmetry. © 2024 The Authors

关键词： Precision engineering

来源：评论

学校读者我要写书评

暂无评论

Characterization of Shale mechanical Properties via Nanoindentation Scratch Test

Characterization of Shale Mechanical Properties via Nanoinde...

引用

Geotechnical Frontiers 2025: Soil Characterization and Improvement

作者： Rahmani, Fereshteh Espinoza, Wilson F. Material Science Engineering and Commercialization Program Texas State Univ. San MarcosTX United States Material Science Engineering and Commercialization Program Dept. of Engineering Technology Texas State Univ. San MarcosTX United States

ISBN: (数字)9780784486016

Shale, a complex sedimentary rock, exhibits heterogeneous mechanical behavior influenced by its mineral composition and microstructure. Nanoindentation scratch tests offer a promising method to probe the local mechanical properties and understand shale’s response to applied stress at the nanoscale. In this study, shale samples were prepared and subjected to nanoindentation scratch tests, with a systematic approach adopted to analyze critical load, scratch depth, and coefficient of friction (COF) in both parallel and perpendicular orientations to their bedding planes. The results highlight the impact of shale’s anisotropic nature on its mechanical properties. The parallel direction showed 50.18% and 13.37% greater critical loads than the perpendicular direction under scratching forces of 150 and 300 µN. Similarly, a scratch depth analysis reveals a 60.90% reduction of scratch penetration in the parallel direction, attributed to cohesive forces and grain alignment. The coefficient of friction, which fluctuates with lateral displacement, reflects the heterogeneity of shale’s mineral composition and the varying interaction between the indenter and different shale minerals. The obtained average adhesion work in the parallel orientation showed 34.95% more surface energy compared to the perpendicular orientation in the tested shales. These findings demonstrate that microstructural features directly influence fracture propagation and mechanical behavior. The insights gained from this study can be utilized to optimize hydraulic fracturing and drilling operations, and to ensure improved resource extraction efficiency and structural stability. This research evaluates factors that affect the nanostructure and the mechanical properties of shale obtained through indentation techniques. © ASCE.

关键词： Nanoindentation

来源：评论

学校读者我要写书评

暂无评论

MXene Hybridized Polymer with Enhanced Electromagnetic Energy Harvest for Sensitized Microwave Actuation and Self‑Powered Motion Sensing

引用

Nano-Micro Letters 2025年第3期17卷 265-279页

作者： Yu‑Ze Wang Yu‑Chang Wang Ting‑Ting Liu Quan‑Liang Zhao Chen‑Sha Li Mao‑Sheng Cao School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081People’s Republic of China School of Materials Science and Engineering Peking UniversityBeijing 100871People’s Republic of China School of Mechanical and Material Engineering North China University of TechnologyBeijing 100144People’s Republic of China Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education of the People’s Republic of ChinaHeilongjiang UniversityHarbin 150080People’s Republic of China

Polymeric microwave actuators combining tissue-like softness with programmablemicrowave-responsive deformation hold great promise for mobile intelligentdevices and bionic soft robots. However, their application is challenged by restricted electromagneticsensitivity and intricate sensing coupling. In this study, a sensitized polymericmicrowave actuator is fabricated by hybridizing a liquid crystal polymer with Ti3C2Tx(MXene). Compared to the initial counterpart, the hybrid polymer exhibits unique spacechargepolarization and interfacial polarization, resulting in significant improvements of230% in the dielectric loss factor and 830% in the apparent efficiency of electromagneticenergy harvest. The sensitized microwave actuation demonstrates as the shortenedresponse time of nearly 10 s, which is merely 13% of that for the initial shape memory polymer. Moreover, the ultra-low content of MXene (upto 0.15 wt%) benefits for maintaining the actuation potential of the hybrid polymer. An innovative self-powered sensing prototype that combinesdriving and piezoelectric polymers is developed, which generates real-time electric potential feedback (open-circuit potential of ~ 3 mV) duringactuation. The polarization-dominant energy conversion mechanism observed in the MXene-polymer hybrid structure furnishes a new approachfor developing efficient electromagnetic dissipative structures and shows potential for advancing polymeric electromagnetic intelligent devices.

关键词： Microwave absorption Electromagnetic response Energy harvest Self-sensing Soft actuator

来源：评论

学校读者我要写书评

暂无评论

Change of Electrical and Transport Properties of Nickel Oxide by Carrier Concentration and Temperature through First‑Principle Calculations

引用

Nanomanufacturing and Metrology 2023年第4期6卷 109-118页

作者： Nayem Md.Reza Shah Chang‑Dong Yeo Minyeong Choi Yang‑Ki Hong Jeong H.You Department of Mechanical Engineering Texas Tech UniversityLubbockTX 79409USA Department of Electrical and Computer Engineering and Material Science Ph.D.Program The University of AlabamaTuscaloosaAL 35487USA Department of Mechanical Engineering School of EngineeringUniversity of St.ThomasSt.PaulMN 55105USA

Nickel is typically used as one of the main components in electrical contact devices or *** oxide(NiO)is usually formed on the surfaces of electrodes and can negatively impact system performance by introducing electrical contact *** thermal,electrical,and transport properties of NiO,as a Mott insulator or a p-type semiconductor,can be altered by operating and environmental conditions such as temperature and stress/strain by *** this study,we inves-tigate the fundamental material properties of NiO through the first-principle ***,we obtain and compare the lattice parameter,magnetic moment,and electronic structure for NiO via the WIEN2K simulations with four different poten-tials(i.e.,GGA,GGA+U,LSDA,and LSDA+U).Then,using the WIEN2K simulation results with LSDA+U potential that produces a highly accurate bandgap for NiO,we calculate the electrical conductivity and electrical part of the thermal conductivity of nickel and NiO as a function of temperature and carrier concentration through the BoltzTraP *** simulation results revealed that the electrical conductivity relative to the relaxation time for NiO increases with the carrier concentration,while it shows a slightly decreasing trend with temperature under a fixed carrier *** contrast,the electrical part of the thermal conductivity shows an increasing trend considering carrier concentration and temperature.

关键词： Nickel oxide Magnetic moments Density of states Seebeck coefcient Electrical conductivity

来源：评论

学校读者我要写书评

暂无评论

Enhancing the thermoelectric performance of BiCuSeO ceramics by entropy engineering

引用

Ceramics International 2025年第13期51卷 17259-17267页

作者： Jiang, Jialing Wang, Honglei Xu, Zhenjiu Fu, Zhuang Zhao, Lijun Wang, Lei Dong, Songtao Ju, Hongbo School of Material Science and Engineering Jiangsu University of Science and Technology Zhenjiang212003 China Department of Mechanical Engineering University of Coimbra CEMMPRE ARISE Rua Luís Reis Santos Coimbra3030-788 Portugal Faculty of Mechanical Engineering University of Ljubljana TINT - Laboratory for Tribology and Interface Nanotechnology Aškerčeva 6 Ljubljana1000 Slovenia

Bi1−3x−y−zAlxLaxSbxYyCazCuSeO (x = y = z = 0;x = 0.02, y = z = 0;x = y = 0.02, z = 0;and x = y = z = 0.02) ceramics were prepared using a combination of high-energy ball milling, cold-isostatic pressing, and sintering. Results demonstrated that the incorporation of multiple elements led to an increase in the carrier concentration within the BiCuSeO system, resulting in enhanced electrical conductivity. In particular, the electrical conductivity of the system increased from 9.10 S cm−1 (BiCuSeO) to 66.96 S cm−1 (Bi0.90Al0.02La0.02Sb0.02Y0.02Ca0.02CuSeO) at 323 K. Furthermore, the maximum power factor value of Bi0.90Al0.02La0.02Sb0.02Y0.02Ca0.02CuSeO was found to be 421.71 μW m−1 K−2 at 773 K. After doping, the thermal conductivity of the system decreased from 0.57 to 0.29 W m−1 K−1 at 773 K. The ZTmax value of Bi0.90Al0.02La0.02Sb0.02Y0.02Ca0.02CuSeO was ∼1.06, representing a considerable improvement of approximately 4.2 times compared to that of the pure sample (∼0.25). These findings suggest that the incorporation of multiple elements through doping offers a promising strategy for enhancing the thermoelectric performance of BiCuSeO. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Milling (machining)

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：