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Journal of Materials Science & Technology 2021年第29期88卷 258-269页

作者： yumeng ni Fan Zhang Demian I.Njoku Yingjie Yu Jinshan Pan Meijiang Meng Ying Li Corrosion and Protection Division Shenyang National Laboratory for Materials ScienceInstitute of Metal ResearchChinese Academy of SciencesShenyang110016China School of Material Science and Technology University of Science and Technology of ChinaShenyang110016China Department of Engineering and Design School of Engineering and InformaticsUniversity of SussexBrightonBN19RHUnited Kingdom Division of Surface and Corrosion Science KTH Royal Institute of TechnologyDrottning Kristinas väg.51SE-10044StockholmSweden Shenyang National Laboratory for Materials Science Northeastern UniversityShenyang110819China

In this study,the corrosion behavior of the CuAl-niC abradable seal coating system in chloride solution was investigated to systematically research the effect of porosity,multiphase,and multilayer structure on the corrosion *** the composition and structure analysis,the corrosion process of the system was predicted and then verified with mercury intrusion porosimetry,cross-section SEM/EDS analysis,and electrochemical *** results demonstrated that the interphase selective corrosion caused the porosity of the top layer to decrease first and then increase during the corrosion *** interlayer galvanic corrosion,determined by the pore connectivity,is crucial for corrosion failure.

关键词： Abradable seal coating system Galvanic corrosion Multilayer Porosity

铜铝/镍石墨可磨耗封严涂层相选择性溶解机制有限元研究

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中国腐蚀与防护学报 2023年第4期43卷 855-861页

作者：倪雨朦于英杰严慧王嵬李瑛中国科学院金属研究所沈阳110016 湖南工业大学材料与先进制造学院株洲412007 中国科学技术大学材料科学与工程学院沈阳110016 东北电力大学化学工程学院吉林132012

以铜铝/镍石墨可磨耗封严涂层为研究对象,利用有限元方法对涂层腐蚀初期发生的相选择性溶解反应进行仿真模拟,探究涂层选材成分比与其耐蚀性的关系。所建腐蚀模型的几何尺寸和边界条件分别由形貌表征与电化学测试结果而确定。建模模拟后... 详细信息

以铜铝/镍石墨可磨耗封严涂层为研究对象,利用有限元方法对涂层腐蚀初期发生的相选择性溶解反应进行仿真模拟,探究涂层选材成分比与其耐蚀性的关系。所建腐蚀模型的几何尺寸和边界条件分别由形貌表征与电化学测试结果而确定。建模模拟后,将模拟结果中的涂层自腐蚀电位及溶解情况分别与极化曲线实测涂层自腐蚀电位及ICP-OES实测涂层的溶解结果对比可见,模拟结果与实测结果一致,验证了模型的可靠性。所建模型在一定程度上阐释了涂层选材与其耐蚀性的关系,为未来涂层的耐蚀设计提供相应的参考。

关键词：可磨耗封严涂层电偶腐蚀有限元腐蚀防护

高Zn含量Al-Zn-Mg-Cu系合金的热处理技术研究综述

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包装学报 2024年第5期16卷 72-82页

作者：吴琴吕华钦范才河倪雨朦胡泽艺武帅湖南工业大学材料与先进制造学院湖南株洲412007

综述了高Zn含量(质量分数不小于7%)Al-Zn-Mg-Cu系合金的研究现状,重点介绍了高Zn含量Al-Zn-Mg-Cu系合金热处理技术(均匀化处理、固溶处理、时效处理及形变热处理)的研究近况,阐述了不同热处理技术对高Zn含量Al-Zn-Mg-Cu系合金组织性能... 详细信息

综述了高Zn含量(质量分数不小于7%)Al-Zn-Mg-Cu系合金的研究现状,重点介绍了高Zn含量Al-Zn-Mg-Cu系合金热处理技术(均匀化处理、固溶处理、时效处理及形变热处理)的研究近况,阐述了不同热处理技术对高Zn含量Al-Zn-Mg-Cu系合金组织性能的影响机制,展望了高Zn含量Al-Zn-Mg-Cu系合金发展趋势及前景,旨在为Al-Zn-Mg-Cu合金综合性能的提升及铝合金材料产业的持续发展提供参考。

关键词：高Zn含量 Al-Zn-Mg-Cu系合金热处理技术

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CFRP表面的激光处理及其结构与性能研究

合成纤维工业 2020年第4期43卷 30-33,38页

作者：周柄岑吴瑶孔海娟倪雨萌晏其凤冯龙上海工程技术大学材料工程学院上海201620 上海市轻质复合材料重点实验室上海201620 上海工程技术大学上海市激光先进制造技术协同创新中心上海201620

采用光纤激光器对碳纤维复合材料(CFRP)表面进行处理,通过研究激光的光斑直径(D g)和Z轴距离(L Z)的关系,研究了L Z对CFRP表面形貌、结构,以及对CFRP与铝合金单搭接接头胶接拉伸剪切强度(τ)的影响。结果表明:L Z为5~25 mm时,随着L Z的... 详细信息

采用光纤激光器对碳纤维复合材料(CFRP)表面进行处理,通过研究激光的光斑直径(D g)和Z轴距离(L Z)的关系,研究了L Z对CFRP表面形貌、结构,以及对CFRP与铝合金单搭接接头胶接拉伸剪切强度(τ)的影响。结果表明:L Z为5~25 mm时,随着L Z的增加,D g增大;L Z为20 mm时,激光处理后的CFRP表面的环氧树脂基本去除,碳纤维几乎没有被破坏,排列仍然规整,环氧树脂去除的效果较好,且其表面烧蚀率最大为7.6 g/s,CFRP与铝合金单搭接接头的τ最大为15.46 MPa。

关键词：碳纤维复合材料激光处理 Z 轴距离光斑直径铝合金胶接拉伸剪切强度结构

Probing the intrinsic optical quality of CVD grown MoS2

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Nano Research 2017年第5期10卷 1608-1617页

作者： Amina Zafar Haiyan Nan Zainab Zafar Zhangting Wu Jie Jiang yumeng You Zhenhua ni Department of Physics and Key Laboratory of MEMS of the Ministry of Education Southeast University Nanjing 211189 China Ordered Matter Science Research Center Southeast University Nanjing 211189 China

Optical emission efficiency of two-dimensional layered transition metal dichalcogenides （TMDs） is one of the most important parameters affecting their optoelectronic performance. The optimization of the growth parameters by chemical vapor deposition （CVD） to achieve optoelectronic-grade quality TMDs is, therefore, highly desirable. Here, we present a systematic photoluminescence （PL） spectroscopic approach to assess the intrinsic optical and crystalline quality of CVD grown MoS2 （CVD MoS2）. We propose the use of the intensity ratio between the PL measured in air and vacuum as an effective way to monitor the intrinsic optical quality of CVD MoS2. Low-temperature PL measurements are also used to evaluate the structural defects in MoS2, via defect-associated bound exciton emission, which well correlates with the field-effect carrier mobility of MoS2 grown at different temperatures. This work therefore provides a sensitive, noninvasive method to characterize the optical properties of TMDs, allowing the tuning of the growth parameters for the development of optoelectronic devices.

关键词： transition metaldichalcogenides MoS2 chemical vapor deposition photoluminescence defect mobility

温度对碳纤维复合材料与金属间电偶腐蚀电流的影响

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合成纤维工业 2019年第5期42卷 37-40页

作者：周柄岑张新异冯龙倪雨萌晏其凤孔海娟上海工程技术大学材料工程学院

研究了温度对T700碳纤维复合材料(CFRP)与不锈钢和6061铝合金之间的电偶腐蚀的影响,以及电偶腐蚀电流及其腐蚀速率对材料表面形貌的影响。结果表明:CFRP与6061铝合金在氯化钠(NaCl)电解质溶液体系中会发生电偶腐蚀,而CFRP与不锈钢在NaC... 详细信息

研究了温度对T700碳纤维复合材料(CFRP)与不锈钢和6061铝合金之间的电偶腐蚀的影响,以及电偶腐蚀电流及其腐蚀速率对材料表面形貌的影响。结果表明:CFRP与6061铝合金在氯化钠(NaCl)电解质溶液体系中会发生电偶腐蚀,而CFRP与不锈钢在NaCl电解质溶液体系中则会发生较小的电偶腐蚀;随着温度的增加,CFRP与6061铝合金发生的电偶腐蚀电流、平均电偶腐蚀速率相应增大,表面腐蚀现象更加严重;在NaCl电解质溶液体系中电偶腐蚀作用对CFRP影响不大,CFRP基本没有受到腐蚀。

关键词：碳纤维复合材料电偶腐蚀金属铝合金腐蚀速率温度

硫酸浓度对2024铝合金表面陶瓷膜组织和性能的影响

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包装学报 2022年第3期14卷 20-28页

作者：王博文阳建君范才河倪雨朦欧玲孙斌董世运湖南工业大学材料与先进制造学院湖南株洲412007 中国人民解放军陆军装甲兵学院装备再制造技术国防科技重点实验室北京100072 安徽建业科技有限公司技术中心安徽淮北235000

将高强韧2024铝合金分别在质量浓度为100,200,300 g/L的硫酸溶液中进行60 min的表面陶瓷化处理后,在2024铝合金表面原位生成一层陶瓷膜层。对陶瓷膜层的显微组织、膜层厚度、显微硬度以及电化学性能等进行研究。研究结果表明:随着硫酸... 详细信息

将高强韧2024铝合金分别在质量浓度为100,200,300 g/L的硫酸溶液中进行60 min的表面陶瓷化处理后,在2024铝合金表面原位生成一层陶瓷膜层。对陶瓷膜层的显微组织、膜层厚度、显微硬度以及电化学性能等进行研究。研究结果表明:随着硫酸质量浓度的增加,陶瓷膜层显微硬度先增加后减少,当硫酸质量浓度为200 g/L时,陶瓷膜层显微硬度最大,为273.7 HV;而陶瓷膜层厚度受硫酸浓度影响不大,均为60μm左右。随硫酸质量浓度的增加,陶瓷膜层表面粗糙度R_(a)先减小后增大,当硫酸质量浓度为200 g/L时,表面粗糙度为0.252μm,磨损体积为0.103 mm^(3),只有硫酸质量浓度为100 g/L时所制备陶瓷膜层磨损体积的1/5左右。物相分析得到2024铝合金表面陶瓷膜层主要是γ-Al_(2)O_(3)相。用200 g/L硫酸制备的Al_(2)O_(3)陶瓷膜的自腐蚀电位和极化电阻均达到最大,分别为-0.604 V和48152.9Ω。综合分析陶瓷膜的耐磨性能和耐腐蚀性能,在2024铝合金表面制备Al_(2)O_(3)陶瓷膜层,硫酸的最佳质量浓度为200 g/L。

关键词： 2024铝合金硫酸浓度 Al_(2)O_(3)陶瓷膜耐腐蚀性能

Defects as a factor limiting carrier mobility in WSe2： A spectroscopic investigation

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Nano Research 2016年第12期9卷 3622-3631页

作者： Zhangting Wu Zhongzhong Luo Yuting Shen Weiwei Zhao Wenhui Wang Haiyan Nan Xitao Guo Litao Sun Xinran Wang yumeng You Zhenhua ni Department of Physics andJiangsu Key Laboratory forAdvanced Metallic Materials Southeast University Nanjing 211189 China National Laboratory of Solid State Microstructure School of Electronic Science and Engineering National Center of Microstructures and Quantum Manipulation Nanjing University Nanjing 210093 China SEU-FEI Nano-Pico Center Key Laboratory of MEMS of the Ministry of Education Southeast University Nanjing 210095 China Jiangsu Key Laboratory for Design and Fabrication of Micro-Nano Biomedical Instruments School of Mechanical Engineering Southeast University Nanjing 211189 China Ordered Matter Science Research Center Southeast University Nanjing 211189 China

The electrical performance of two-dimensional transition metal dichalcogenides （TMDs） is strongly affected by the number of structural defects. In this work, we provide an optical spectroscopic characterization approach to correlate the number of structural defects and the electrical performance of WSe2 devices. Low-temperature photoluminescence （PL） spectra of electron-beam-lithography- processed WSe2 exhibit a clear defect-induced PL emission due to excitons bound to defects, which would strongly degrade the electrical performance. By adopting an electron-beam-free transfer-electrode technique, we successfully prepared a backgated WSe2 device containing a limited amount of defects. A maximum hole mobility of approximately 200 cm2.V -1.s-1 was achieved because of the reduced scattering sources, which is the highest reported value for this type of device. This work provides not only a versatile and nondestructive method to monitor the defects in TMDs but also a new route to approach the room-temperature phonon-limited mobility in high-performance TMD devices.

关键词： two-dimensional materials tungsten diselenide structural defects photoluminescencespectroscopy mobility

Scalable Rhodaelectro-Catalyzed Expedient Access to Seven-Membered Azepino[3,2,1-hi]indoles via [5+2] C-H/N-H Annulation

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CCS Chemistry 2022年第6期4卷 1858-1870页

作者： yumeng Yuan Jinlan Zhu Zhongyuan Yang Shao-Fei ni Qiufeng Huang Lutz Ackermann Fujian Key Laboratory of Polymer Science Fujian Provincial Key Laboratory of Advanced Materials Oriented Chemical EngineeringCollege of Chemistry and Materials ScienceFujian Normal UniversityFuzhouFujian 350007 Department of Chemistry and Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province Shantou UniversityShantouGuangdong 515063 Institut Für Organische Und Biomolekulare Chemie Wohler Research Institute for Sustainable ChemsitryGeorg-August-Universitat Gottingen37077 Gottingen

We report the establishment of a rhodaelectrocatalyzed[5+2]N-H/C-H oxidative annulation of alkynes by 7-arylindoles,enabling the synthesis of seven-membered azepino[3,2,1-hi]indoles using electricity as the sole *** reaction could be scaled up to gram-scale by *** key rhodium(Ⅲ)intermediates were isolated and fully *** analysis,X-ray photoelectron spectroscopy studies,and density functional theory calculations are suggestive of a rhodium(Ⅲ-Ⅳ-Ⅱ-Ⅲ)manifold.

关键词： C-H activation electrocatalysis rhodium annulation indole

Enhanced electromagnetic-interference shielding effectiveness and mechanical strength of Co-ni coated aramid-carbon blended fabric

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Chinese Journal of Aeronautics 2021年第10期34卷 103-114页

作者： Qin WANG yumeng XU Siyi BI Yinxiang LU Department of Materials Science Fucian UniversityShanghai 200433China

An efficient method was proposed to prepare high-performance conductive AramidCarbon Blend Fabrics(ACBF)with cobalt-nickel(Co-ni)alloy coatings,which is conducive to industrial *** grid-like substrate composed of aramid and carbon fibers was innovatively used in flexible Electromagnetic Interference(EMI)shielding *** natural network structure is advantageous to the uniform deposition of metal particles to the establishment of conductive pathways subsequently in order to improve *** induction of a synergistic effect from Electromagnetic(EM)wave-reflection and EM wave-absorption through the whole carbonCo-ni-ternary system notably enhanced the EMI Shielding Effectiveness(SE)value to an average of 42.57 d B in the range of 30-6000 *** the other hand,together with the inherent toughness of the alloy coatings,the tensile strength of the aramid fibers used for bulletproof made a significant contribution to the desired mechanical *** light weight of the resultant composite made it applicable to aerospace vehicles simultaneously.X-ray Photoelectron Spectroscopy(XPS)was conducted to investigate the variations of elements and groups on the sample surface in pretreating *** elemental components and surface morphologies of fabric samples during different stages of the process were investigated by Scanning Electron Microscope(SEM)and Energy Dispersive spectrometer(EDX)measurements.X-Ray Diffraction(XRD)results indicated that the obtained Co-ni alloy coating had a combined Hexagonal Closed-Packed(HCP)and FacedCentered Cubic(FCC)crystalline *** relatively high corrosion resistance demonstrated in different acid and alkaline conditions was instrumental in more complex environments as well.

关键词： Aramid fibers Carbon fibers Cobalt-nickel(Co-ni)Coating Electroless plating Electromagnetic shielding