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Plasma preparation method and tribological properties of diamond-like carbon coating on magnesium alloy AZ31 substrate

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Science China(Technological Sciences) 2019年第11期62卷 1939-1947页

作者： HAN BeiBei ju dongying SATO Susumu ZHAO Huijun Department of Electronic Engineering Graduate School of EngineeringSaitama Institute of TechnologyFukaya 369-0293Japan Advanced Science Institute Saitama Institute of TechnologyFukaya 369-0293Japan Ningbo Institute of Materials Industry Innovation Ningbo 315033China School of Mechanical Engineering Hangzhou Dianzi UniversityHangzhou 310018China Department of Information System Saitama Institute of TechnologyFukaya 369-0293Japan

Magnesium alloys are light weight and exhibit good recyclability but suffer from low hardness and wear *** this study,the hardness and wear resistance of AZ31 magnesium alloy were improved by depositing diamond-like carbon(DLC)films as hard protective coatings using ion-beam-enhanced deposition with various CH4/H2 ratio,gas flow rates and accelerating *** supporting effect of the magnesium alloy was enhanced by the production of a graded interfacial layer which is composed of film atoms and substrate *** composition and mechanical properties of the DLC coatings were characterized using scanning electron microscopy(SEM),Raman spectroscopy,Rockwell test and *** tribological properties of the coating were also investigated using a frictional surface microscope with an in situ observation system and friction force *** DLC films were characterized by a lower intensity ratio of the D-peak to G-peak(ID/IG),higher hardness,and improved tribological properties when deposited at a lower accelerating voltage(6 kV).At the CH4/H2 ratio of 1:99 and 6 sccm/6 kV,minimum ID/IG values of 0.62,relatively low friction force value of 0.12 N,and a maximum hardness of 4056HV were attained *** addition,the DLC film exhibited improved wear resistance and a shallower wear track at this condition.

关键词： DLC film magnesium alloy plasma preparation hardness wear resistance

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Effect of casting speed on microstructure,corrosion behaviour and in vivo bone reaction of Mg-rare earth alloys

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Science China(Technological Sciences) 2021年第2期64卷 213-222页

作者： WANG HaiJian WANG HaiWei KUMAZAWA Takashi ju dongying CAO JianTing Department of Electronic Engineering Graduate School of EngineeringSaitama Institute of TechnologyFukaya 369-0293Japan Institute of Metal Research Chinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026China School of Materials and Metallurgy University of Science and Technology LiaoningAnshan 114051China Ningbo Haizhi Institute of Materials Industry Innovation Ningbo 315000China

In this study,two casting speeds of 10 and 30 r/min were used in vertical twin-roll casting(TRC)to obtain Mg-rare earth(Mg-RE)alloys,and their microstructures,corrosion behaviours and in vivo bone reactions were investigated in *** results indicated that the roll-castings of TRC-30 r/min exhibited a finer grain size and higher volume fraction of non-crystallization than those in castings of TRC-10 r/***,the results of electrochemical impedance spectroscopy(EIS)and potentiodynamic polarization indicated that the castings of TRC-30 r/min displayed a higher corrosion resistance compared with those in the castings of TRC-10 r/*** tests showed that a higher degree of newly formed bone tissues was achieved by implants of TRC-30 r/***,in vivo tests displayed that degradation properties of the TRC-30-r/min implants were better than those of the TRC-10-r/min implants;furthermore,the degradation layer was a two-layer structure,and P and Ca were enriched in the outer degradation *** summary,these findings elucidated that casting speed has a substantial effect on the microstructure and degradation property of Mg-based implants,and the degradation property performs better with increased casting speed.

关键词： Mg-RE alloys microstructure corrosion resistance in vivo

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Influences of working pressure on properties for TiO_2 films deposited by DC pulse magnetron sputtering

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Journal of Environmental Sciences 2009年第6期21卷 741-744页

作者： ZHANG Can DING Wanyu WANG Hualin CHAI Weiping ju dongying Institute of Optoelectronic Materials and Device Dalian Jiaotong University Dalian 116028 China School of Materials Science and Engineering Dalian Jiaotong University Dalian 116028 China Department of Material Science and Engineering Saitama Institute of Technology Fukaya 369-0293 Japan

TiO2 films were deposited at room temperature by DC pulse magnetron sputtering *** crystalline structures,morphological features and photocatalytic activity of TiO2 films were systematically investigated by X-ray diffraction（XRD）,atomic force microscopy（AFM） and ultraviolet spectrophotometer,*** results indicated that working pressure was the key deposition parameter in？uencing the TiO2 film phase composition at room temperature,which directly affected its photocatalytic *** increasing working pressure,the target self-bias decreases ***,low temperature TiO2 phase（anatase） could be deposited with high working *** anatase TiO2 films deposited with 1.4 Pa working pressure displayed the highest photocatalytic activity by the decomposition of Methyl Orange solution,which the degradation rate reached the maximum（35%） after irradiation by ultraviolet light for 1 h.

关键词： TiO2 film anatase UV induced photocatalysis DC pulse magnetron sputtering

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A Decoupling Control Model on Perturbation Method for Twin-Roll Casting Magnesium Alloy Sheet

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Journal of Materials Science & Technology 2015年第5期31卷 517-522页

作者： Wenyu Zhang dongying ju Hongyang Zhao Xiaodong Hu Yao Yao Yujun Zhang School of Software University of Science and Technology Liaoning School of Materials and Metallurgy University of Science and Technology Liaoning School of Mechanical Engineering and Automation University of Science and Technology Liaoning

To better understand the twin-roll casting process,based on the analysis of the solidification phenomenon,the geometry shape of the molten metal pool,the continuity of metal and the balance of energy and momentum,five critical partial equations were established separately including the equations of pool level,solidification process,roll separating force,roll gap and casting ***,to obtain a uniform sheet thickness and keep a constant roll separating force,a decoupling control model was built on the perturbation method to eliminate the interference of process *** simulation results show that the control model is valuable to quickly and accurately determine the control ***,Mg alloy sheets with high quality were cast by applying this model.

关键词： Twin-roll casting Decoupling control model Perturb

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A strategy based on water soluble coal tar pitches to construct MnO_(2)@C composite materials with high electrochemical performance

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Science China(Technological Sciences) 2024年第1期67卷 311-320页

作者： LIU Bo WANG Kun GUO ZhaoQi HAN BeiBei XU GuiYing ju dongying AN BaiGang LI YongCheng NI ZhenYong ZHOU WeiMin Key Laboratory of Energy Materials and Electrochemistry Research Liaoning Province University of Science and Technology LiaoningAnshan 114051China Advanced Science Research Laboratory Saitama Institute of TechnologyFusaiji 1690Japan Liaoning Starry Sky Sodium Battery Co. Ltd.Anshan 114051China Sinosteel Anshan Research Institute of Thermo-Energy Co. Ltd.Anshan 114051China State Key Laboratory of Marine Resource Utilization in South China Sea Hainan Provincial Key Lab of Fine ChemistrySchool of Chemical Engineering and TechnologyHainan UniversityHaikou 570228China Key Laboratory of Advanced Fuel Cells and Electrolyzers Technology of Zhejiang Province Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China

The water soluble coal tar pitches(WS-CTPs)were successfully prepared and used to construct the MnO_(2)@C composite materials by a hydrothermal *** is interestingly observed that the structures and morphologies of MnO_(2)@C materials can be controlled by controlling the dosages of WS-CTPs and ***,it is aware that MnO_(2)exists in the MnO_(2)@C materials in an amorphous *** with MnO_(2),MnO_(2)@C materials output a remarkable improvement in electrochemical *** instance,MnO_(2)@C-0.3 shows the storage capacity at 965.7 mA h g^(−1)after 300 cycles at a current density of 0.1 A g^(−1).In addition,after 600 cycles at a current density of 1.0 A g^(−1),the storage capacity of MnO_(2)@C-0.3 still keeps 450.3 mA h g^(−1),indicating that MnO_(2)@C-0.3 owns tremendous cycle stability at a high current *** view of the fact that the coal tar pitches possess great cost advantages,the strategy of using WS-CTPs as a carbon source to cover the metal oxides is a competitive way to expand the application of metal oxides in the fabrication of electrodes of LIBs.

关键词： water soluble coal tar pitches MnO_(2) composite materials lithium ion batteries(LIBs) energy storage systems(ESSs) coal tar pitches

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Hierarchical pomegranate-structure design enables stress management for volume release of Si anode

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Journal of Materials Science & Technology 2023年第26期157卷 1-10页

作者： Fang Di Zhenxing Wang Chong Ge Lixiang Li Xin Geng Chengguo Sun Haiming Yang Weimin Zhou dongying ju Baigang An Feng Li Key Laboratory of Energy Materials and Electrochemistry Liaoning Province School of Chemical EngineeringUniversity of Science and Technology LiaoningAnshan 114051China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China Hainan Provincial Key Lab of Fine Chemistry School of Chemical Engineering and TechnologyHainan UniversityHaikou 570228China Jihua Laboratory Guangdong ProvinceFoshan 528200China

Si is a promising anode material for lithium-ion batteries owing to its high theoretical ***-ever,large stress during(de)lithiation induces severe structural pulverization,electrical contact failure,and unstable solid-electrolyte interface,which hampers the practical application of Si ***,a Si-based anode with a hierarchical pomegranate-structure(HPS-Si)was designed to modulate the stress variation,and a sub-micronized Si-based sphere was assembled by the nano-sized Si nanospheres with sub-nanometer-sized multi-phase modification of the covalently linked SiO_(2-x),SiC,and *** sub-micronized HPS-Si stacked with Si nanospheres can avoid agglomerates during cycling due to the high surface energy of ***,the reasonable pore structure from SiO_(2) reduction owing to density difference is enough to accommodate the limited volume *** Si spheres with a size of about 50 nm can prevent ***_(2-x),and SiC as flexible and rigid layers,have been syner-gistically used to reduce the surface stress of conductive carbon layers to avoid *** covalent bonding immensely strengthens the link of the modification with Si nanospheres,thus resisting stress ***,a full cell comprising an HPS-Si anode and a LiCoO_(2) cathode achieved an energy density of 415 Wh kg^(-1) with a capacity retention ratio of 87.9%after 300 cycles based on the active *** is anticipated that the hierarchical pomegranate-structure design can provide inspiring insights for further studies of the practical application of silicon anode.

关键词： Stress management Silicon anode Hierarchical structure Covalent bonding Volume release

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Organosilicon modified method to improve Li^+ storage capacity of graphene oxide (GO)

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Science China(Technological Sciences) 2020年第12期63卷 2709-2716页

作者： WANG Kun ju dongying XU GuiYing HAN BeiBei CHAI MaoRong WANG YingXin Li LiXiang ZHANG XueHu UCIDA Masaya ZHOU WeiMin Key Laboratory of Energy Materials and Electrochemistry Research Liaoning Province School of Chemical EngineeringUniversity of Science and Technology LiaoningAnshan 114051China School of Materials and Metallurgy University of Science and Technology LiaoningAnshan 114051China Advanced Science Research Laboratory Saitama Institute of Technology1690 FusaijiFukayaJapan JiXi Weida New Material Technology Co. LtdJixi 158100China

Organosilicon modified reduced graphene oxide(Mr GO) has been fabricated by direct organosilicon modification of graphene oxide(GO). Interestingly,it is observed that 3D rGO-like structures occurred after directly carrying out the organosilicon modification on the surface of GO. The obtained organosilicon Mr GO displays the more remarkable improvement of electrochemical performances than GO,which was verified by electrochemical measurements in detail. For instance,the organosilicon MrGO shows the cycling performances at 901 mA hg^-1 after 200 cycles at 0.1 Ag^-1 and 446 mA hg^-1 after 300 cycles at 2.0 Ag^-1,respectively. These results unveil that organic modification method is an effective way to improve the Li^+ storage capacity of general carbon materials.

关键词： graphene oxide(GO) surface modification organosilicon modification 3D rGO-like structure organic-inorganic concept lithium ion batteries(LIBs)

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Lightweight Frame Topology Optimization Method Based on Multi-objective

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材料科学与工程（中英文B版） 2018年第2期8卷 49-55页

作者： Rui Lyu Hai Liu dongying ju Department of Electronic Science and Engineering Saitama Institute of Technology UniversityFukaya 369-0293Japan School of Mechanical Engineering He Bei University of TechnologyTianJin 300387China

The application of new materials is an important direction for automotive *** the basis of ensuring the comprehensive performance of components,the optimization of new material structures through topology optimization methods can further improve the level of lightweight *** paper takes the automobile frame as the research object,based on the magnesium alloy,studies the frame topology with the objective function of mass and strength under multiple working conditions,and realizes the lightweight of the automobile frame structure through the multi-objective topology optimization *** to the topological optimization method of penalty function for solid isotropic materials,the objective function of the quality topology optimization and the objective function of intensity topology optimization under multi-operating conditions are defined by the compromised programming *** method avoids the disadvantage that single-target topology optimization cannot consider other factors and is suitable for multi-objective topology optimization of continuum structures.

关键词： Frame multi-objective topology optimization magnesium alloy lightweight

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Cr12MoV模具钢的回火工艺

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金属热处理 2016年第1期41卷 39-42页

作者：邓小虎巨东英天津职业技术师范大学天津市高速切削及精密加工重点实验室天津300222 日本埼玉工业大学先端科学研究所深谷埼玉3690293

对淬火后Cr12MoV钢试样进行不同温度和时间的回火处理,并对回火后试样的力学性能和微观组织进行分析。结果表明,回火时间对试样微观组织结构以及力学性能有显著影响,当回火时间由0.5 h增加到3 h,回火后析出的合金碳化物组织更为细小,回... 详细信息

对淬火后Cr12MoV钢试样进行不同温度和时间的回火处理,并对回火后试样的力学性能和微观组织进行分析。结果表明,回火时间对试样微观组织结构以及力学性能有显著影响,当回火时间由0.5 h增加到3 h,回火后析出的合金碳化物组织更为细小,回火后试样畸变和残余应力更小,表面硬度分布更均匀;与回火时间相比,回火温度从490℃升至510℃时,回火组织和力学性能变化很小。因此,采用490℃回火3 h可以同时满足提高性能和节能的需要。

关键词： Cr12MoV钢回火温度回火时间合金碳化物畸变

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Multi-objective Optimization Design of Magnesium Alloy Wheel Based on Topology Optimization

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材料科学与工程（中英文B版） 2019年第1期9卷 13-24页

作者： JIANG Xin LIU Hai Yoshio Fukushima Minoru Otake Naoki Kawada ZHANG Zhenglai ju dongying Department of Electronic Engineering Graduate School of EngineeringSaitama Institute of TechnologyFukaya 369-0293Japan School of Mechanical Engineering Hebei University of TechnologyTianjin 300000China Advanced Science Research Laboratory Saitama Institute of TechnologyFukaya369-0293Japan ZheJiang HuaShuo Technology CO. LTDNingbo 315000China

Lightweight of automatic vehicle is a significant application trend,using topology optimization and magnesium alloy materials is a valuable *** article designs a new model of automobile wheel and optimizes the structure for *** measuring and analyzing designed model under static force,clear and useful topology optimization results were *** wheel performance before and after optimization,the optimized wheel structure compliance with conditions such as strength can be *** three different materials namely magnesium alloy,aluminum alloy and steel,the stress and strain performances of each materials can be obtained by finite element *** reasonable and superior magnesium alloy wheels for lightweight design were *** research predicts the reliability of the optimization design,some valuable references are provided for the development of magnesium alloy wheel.

关键词： Magnesium alloy wheel structural design topology optimization lightweight finite element

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