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IGNITING SHS BY LASER AND ITS APPLIcATION TO SELEcTIVE LASER SINTERING OF METALLIc POWDER MATERIAL

Acta Metallurgica Sinica(English Letters) 2004年第5期17卷 694-704页

作者： Y.S.Shi S.c.chen X.L.Lu S.H.Huang StateKeyLaboratoryofPlasticFormingSimulationandDie＆MouldTechnology SchoolofMaterialScienceandEngineeringHuazhongUniversityofScienceandTechnologyWuhan430074China

How to directly fabricate metallic functional parts with selective laser sintering (SLS) process is a potential technique that scientists are researching. Existent problems during directly fabricating metal part by use of SLS are analyzed. For the sake of solving the problems, a new idea of adding self-propagating high-temperature synthesis (SHS) material into metallic powder material to form new type of SLS metallic powder material is put forward. This powder material can release controllable amount of heat during its interaction with the laser beam energy to reduce the requirement to laser power during directly sintering metallic part, to prolong the time of metallic liquid phase existing, and to improve the intensity and accuracy of SLS part. For this reason, SHS material′s interaction with the cO2 laser beam energy is researched, which proves that cO2 laser beam energy may instantly ignite SHS reaction. On the basis of the above-mentioned researches, the effect of sintering the metal powder material mixing SHS material with cO2 laser is also researched, which shows: there is an optimal blending ratio of various material in the new metallic powder material. Under the optimal blending ratio and SLS process parameters, this new metallic powder material can indeed release amount of heat and SHS reaction may be controlled within the laser sintering. This research result makes it possible that the metallic part is directly sintered with small cO2 laser (less than 50W), which may greatly reduce the volume, cost and running expenditure of SLS machine, be propitious to application.

关键词： selective laser sintering (SLS) self-propagating high-temperaturesynthesis (SHS) ignition time metallic powder material,metallic part

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ZnS Semiconductive Powder Doped with Transition Metal Ions via Mechanochemical Synthesis Technique

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过程工程学报 2004年第Z1期4卷 424-430页

作者： R.F. Louh c.K. Lin Oscar Lin G.S. chen c.c. chan Dept. of Mater. Sci. & Eng. Feng Chia University Taichung 407 China Dept. of chem. Eng. Feng Chia University Taichung 407 China

The solid state synthesis can be carried out by using the initial pure metal zinc and inorganic sulfur powder mixtures by means of the mechanochemical synthesis route. The completion of solid state reaction between pure zinc and sulfur powder to produce c-ZnS and h-ZnS phases via such a route was rather fast, as compared to other non-sulfide systems by the similar method. The study was aimed to investigate the microstructure development and phase formation through the solid state reaction by controlling the processing parameters involved in this process including grinding media to powder weight ratio, solid state reaction duration, reaction atmosphere, stoichiometric ratio of zinc and sulfur elements, grinding media and choice of minor additives such as teflon-based polymeric lubricants and transition metal dopants (Mn, cu). Both as-synthesized powders and heat-treated ZnS materials with various stoichiometric ratios were characterized by XRD, EXAFS and XANES analysis. The interesting results from X-ray absorption spectroscopy (XAS) would provide us some strong evidence whether stoichiometric and non-stoichiometric ZnS material can be successfully formed. The minor amount (0.5wt%)of Mn+2 or cu+2 ion dopants added to the powder batch with the Zn/S stoichiometric ratio between1.00 to 1.05 was found to favor the reaction rate in the mechanochemical synthesis. Moreover, the obtained results of ZnS phase development under reaction conditions and different transition metal dopants in this study would imply that synthesis of other kind of sulfide compounds can be achieved using the demonstrated technique.

关键词： mechanochemical synthesis ZnS powder,semiconductor powder synthesis solid sate reaction transition metal ions

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Reduction effect of final-pass heavy reduction rolling on the texture development,tensile property and stretch formability of ZWK100 alloy plates

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Journal of Materials Science & Technology 2022年第16期111卷 211-223页

作者： B.Q.Shi L.Y.Zhao X.L.Shang B.H.Nie D.c.chen c.Q.Li Y.Q.cheng School of Materials Science and Hydrogen Energy Foshan UniversityFoshan 528000China School of Materials and Energy Guangdong University of TechnologyGuangzhouGuangdong 510006China GD Midea Air-conditioning Equipment co. Ltd.Foshan 528311China Guangdong Key Laboratory of Hydrogen Energy Technology Foshan 528000China YunFu(Foshan)R&D center of Hydrogen Energy Standardization Yunfu 527326China

Obviously planar anisotropy due to‘TD split’orthotropic texture(TD indicates Transverse direction)always exist in the Rare-earth(RE)or ca containing Mg alloy sheets,which is likely caused by the lowreduction rolling(and annealing)as revealed in our previous *** this work,the as-cast billets of a ZWK100 alloy were subjected to final-pass heavy reduction rolling(FHRR)at 500°c with different reductions(30%-70%)after rough rolling,aiming to investigate the reduction effect on the microstructure and texture *** results show that FHRR with higher reductions above 50%is in favor of shear banding formation but has little effect on the as-deformed texture components,and the excellent formability with single-pass reduction up to 70%is mainly ascribed to the activation of prismatic *** with reduction above 50%and annealing can generate uniform grain structures of~10μm and symmetrical‘oblique-line split’texture in(0001)pole figures,with basal poles tilting by about 50°from ND(Normal direction)towards some oblique-line of TD and RD(Rolling direction)as well as uniform distribution of counter lines as an annular shape,resulting in excellent elongation to failure of~50%and ultra-low planar anisotropyΔr_of~0.1 and high stretch formability(Erichsen value:8.1).The formation‘oblique-line split’texture in(0001)pole figures is mainly correlated with the preferred growth tendency of grains with■//RD,which was suggested to relate to the high mobility of some special boundaries such as 40°-45°■.The influences of starting textures on the mechanical properties,planar anisotropy and related deformation modes,as well as their correlations with the stretch formability were comparatively investigated with the‘TD split’orthotropic texture as a counterpoint.

关键词： Magnesium alloys Texture Plane anisotropy Stretch formability Rolled sheets

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cu对含Sn铁素体不锈钢的力学及耐腐蚀性能的影响

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特殊钢 2024年第3期45卷 49-55页

作者：李阳陈常勇方勇马帅张咪娜姜周华东北大学冶金学院沈阳110819 香港理工大学工业与系统工程系中国香港999077 中国科学院宁波材料技术与工程研究所宁波315201

以0.30%Sn的430铁素体不锈钢为基础,在实验钢中添加一定量的cu来研究cu对实验钢力学性能和耐腐蚀性能的影响。常温拉伸实验和高温拉伸实验结果表明,cu原子在基体中发挥固溶强化效果而增强不锈钢的抗拉强度,但同时因晶界处生成大量的富c... 详细信息

以0.30%Sn的430铁素体不锈钢为基础,在实验钢中添加一定量的cu来研究cu对实验钢力学性能和耐腐蚀性能的影响。常温拉伸实验和高温拉伸实验结果表明,cu原子在基体中发挥固溶强化效果而增强不锈钢的抗拉强度,但同时因晶界处生成大量的富cu相而相应降低不锈钢的塑性。实验钢的耐均匀腐蚀性能随着cu含量的增加而呈现先提高,后降低的趋势,且在含0.45%cu的钢中达到最佳的效果。此外,cu对实验钢的耐晶间腐蚀性能有类似的规律,且在含0.98%cu的钢中达到最佳的效果。

关键词：锡铜铁素体不锈钢力学性能耐腐蚀性能

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Determination of the number ofψ(3686)events taken at BESⅢ

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chinese Physics c 2024年第9期48卷 8-20页

作者： M.Ablikim M.N.Achasov P.Adlarson O.Afedulidis X.c.Ai R.Aliberti A.Amoroso Q.An Y.Bai O.Bakina I.Balossino Y.Ban H.-R.Bao V.Batozskaya K.Begzsuren N.Berger M.Berlowski M.Bertani D.Bettoni F.Bianchi E.Bianco A.Bortone I.Boyko R.A.Briere A.Brueggemann H.cai X.cai A.calcaterra G.F.cao N.cao S.A.cetin J.F.chang G.R.che G.chelkov c.chen c.H.chen chao chen G.chen H.S.chen H.Y.chen M.L.chen S.J.chen S.L.chen S.M.chen T.chen X.R.chen X.T.chen Y.B.chen Y.Q.chen Z.J.chen Z.Y.chen S.K.choi G.cibinetto F.cossio J.J.cui H.L.Dai J.P.Dai A.Dbeyssi R.E.de Boer D.Dedovich c.Q.Deng Z.Y.Deng A.Denig I.Denysenko M.Destefanis F.De Mori B.Ding X.X.Ding Y.Ding Y.Ding J.Dong L.Y.Dong M.Y.Dong X.Dong M.c.Du S.X.Du Y.Y.Duan Z.H.Duan P.Egorov Y.H.Fan J.Fang J.Fang S.S.Fang W.X.Fang Y.Fang Y.Q.Fang R.Farinelli L.Fava F.Feldbauer G.Felici c.Q.Feng J.H.Feng Y.T.Feng M.Fritsch c.D.Fu J.L.Fu Y.W.Fu H.Gao X.B.Gao Y.N.Gao Yang Gao S.Garbolino I.Garzia L.Ge P.T.Ge Z.W.Ge c.Geng E.M.Gersabeck A.Gilman K.Goetzen L.Gong W.X.Gong W.Gradl S.Gramigna M.Greco M.H.Gu Y.T.Gu c.Y.Guan Z.L.Guan A.Q.Guo L.B.Guo M.J.Guo R.P.Guo Y.P.Guo A.Guskov J.Gutierrez K.L.Han T.T.Han F.Hanisch X.Q.Hao F.A.Harris K.K.He K.L.He F.H.Heinsius c.H.Heinz Y.K.Heng c.Herold T.Holtmann P.c.Hong G.Y.Hou X.T.Hou Y.R.Hou Z.L.Hou B.Y.Hu H.M.Hu J.F.Hu S.L.Hu T.Hu Y.Hu G.S.Huang K.X.Huang L.Q.Huang X.T.Huang Y.P.Huang T.Hussain F.Hölzken N.Hüsken N.in der Wiesche J.Jackson S.Janchiv J.H.Jeong Q.Ji Q.P.Ji W.Ji X.B.Ji X.L.Ji Y.Y.Ji X.Q.Jia Z.K.Jia D.Jiang H.B.Jiang P.c.Jiang S.S.Jiang T.J.Jiang X.S.Jiang Y.Jiang J.B.Jiao J.K.Jiao Z.Jiao S.Jin Y.Jin M.Q.Jing X.M.Jing T.Johansson S.Kabana N.Kalantar-Nayestanaki X.L.Kang X.S.Kang M.Kavatsyuk B.c.Ke V.Khachatryan A.Khoukaz R.Kiuchi O.B.Kolcu B.Kopf M.Kuessner X.Kui N.Kumar A.Kupsc W.Kühn J.J.Lane P.Larin L.Lavezzi T.T.Lei Z.H.Lei M.Lellmann T.Lenz c.Li c.Li c.H.Li cheng Li D.M.Li F.Li G.Li H.B.Li H.J.Li H.N.Li Hui Li J.R.Li J.S.Li Ke Li L.J.Li L.K.Li Lei Li M.H.Li P.R.Li Q.M.Li Q.X.Li R.Li S.X.Li T.Li W.D.Li W.G.Li X.Li X.H.Li X.L.Li X.Z.Li Xi Institute of High Energy Physics Beijing 100049China Beihang University Beijing 100191China Bochum Ruhr-University D-44780BochumGermany Budker Institute of Nuclear Physics SB RAS(BINP) Novosibirsk 630090Russia carnegie Mellon University PittsburghPennsylvania 15213USA central china Normal University Wuhan 430079China central South University Changsha 410083China china center of Advanced Science and Technology Beijing 100190China china University of Geosciences Wuhan 430074China chung-Ang University Seoul06974Republic of Korea cOMSATS University Islamabad Lahore CampusDefence RoadOff Raiwind Road54000LahorePakistan Fudan University Shanghai 200433China GSI Helmholtzcentre for Heavy Ion Research GmbH D-64291DarmstadtGermany Guangxi Normal University Guilin 541004China Guangxi University Nanning 530004China Hangzhou Normal University Hangzhou 310036China Hebei University Baoding 071002China Helmholtz Institute Mainz Staudinger Weg 18D-55099MainzGermany Henan Normal University Xinxiang 453007China Henan University Kaifeng 475004China Henan University of Science and Technology Luoyang 471003China Henan University of Technology Zhengzhou 450001China Huangshan college Huangshan 245000China Hunan Normal University Changsha 410081China Hunan University Changsha 410082China Indian Institute of Technology Madras Chennai 600036India Indiana University BloomingtonIndiana 47405USA INFN Laboratori Nazionali di Frascati (A)INFN Laboratori Nazionali di FrascatiI-00044FrascatiItaly(B)INFN Sezione di PerugiaI-06100PerugiaItaly(C)University of PerugiaI-06100PerugiaItaly INFN Sezione di Ferrara (A)INFN Sezione di FerraraI-44122FerraraItaly(B)University of FerraraI-44122FerraraItaly Inner Mongolia University Hohhot 010021China Institute of Modern Physics Lanzhou 730000China Institute of Physics and Technology Peace Avenue 54BUlaanbaatar 13330Mongolia Instituto de Alta Investigación Universidad de TarapacáCasilla 7DArica 1000000Chile Jilin University Changchun 130012China Joha

The number ofψ(3686)events collected by the BESⅢdetector during the 2021 run period is determined to be(2259.3±11.1)×10~6 by counting inclusiveψ(3686)hadronic *** uncertainty is systematic and the statistical uncertainty is ***,the numbers ofψ(3686)events collected during the 2009 and 2012run periods are updated to be(107.7±0.6)×10~6 and(345.4±2.6)×10~6,*** numbers are consistent with the previous measurements within one standard *** total number ofψ(3686)events in the three data samples is(2712.4±14.3)×10~6.

关键词： ψ(3686) inclusive process Hadronic events BESⅢdetector

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THE EFFEcT OF POWERFUL OXYGEN EVOLUTION METAL-OXIDE ON THE ELEcTROOXIDATION OF METHANOL

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Acta Metallurgica Sinica(English Letters) 2001年第2期14卷 103-108页

作者： X.c. chen, Y.X. Liu, J. Li, J.J. chen and H.Z. Liu (Department of Metallurgy Science and Engineering, central South University, changsha 410083, china) Dept. of Metall. Sci. and Eng. Central South Univ. Changsha 410083 China

An improved thermal decomposition method is used to prepare modified titanium base anodes. Some researches have been carried out to learn about the oxygen evolution properties of RuMn, Ruco and RuEu etc. in H2SO4 solution and their effect on the electrooxidation of methanol if they are added into the catalytic layers of Pt/Ti electrodes. The result indicates that the Pt/Ti electrodes containing RuMn, Ruco, Ruce and RuEu, etc. metal oxide catalysts with the powerful evolution property exhibit a higher electro-catalytic activity towards methanol electrooxidation than Pt/Ti electrodes without composite metal oxide catalysts.

关键词： Anodes Decomposition Methanol Oxidation Titanium

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The structural changes of blood pyropolymers and their beneficial electrocatalytic activity toward oxygen reduction

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chinese Science Bulletin 2013年第23期58卷 3698-3703页

作者： GUO chaoZhong chen changGuo LUO ZhongLi college of chemistry and chemical Engineering Chongqing University college of Basic Medical Sciences Molecular Medicine and Cancer Research CenterChongqing Medical University

There is a growing interest in designing more effective fuel cell cathode catalyst *** the partial pyrolysis of animal bloods has been used to produce the blood pyropolymers,which are an intermediate substance between a polymer and carbonaceous *** pyropolymers were yielded by carbonization process below 600°*** structural changes in the pyropolymers were characterized by X-ray diffraction,and their formation was checked by micro-IR spectra,thermogravimetric and differential thermal *** potential electrocatalytic properties were evaluated using the linear sweep voltammetry in the O2-saturated KOH *** is found that the process of pyropolymer formation began about 200°c and completed around500°*** change of particle phase depends on the formation of the pyropolymers,but has no effect to their internal carbon structures which are controlled by pyrolysis process ***,it is confirmed that the crystalline phases in the pyropolymers can exist at the surface of heat-treated *** can be also found that the carbon materials are active toward oxygen reduction and their activity is associated with the carbonization *** study will stimulate the designers to design the highly active catalysts by using native blood pyropolymers as the precursors.

关键词：电催化活性动物血液结构变化氧还原线性扫描伏安法催化剂前体 X-射线衍射高活性催化剂

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The Ductile to Brittle Transition Behavior of the Modified 9cr-1Mo Steel and Its Laser Welds

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材料导报 2004年第8期18卷 121-123页

作者： H.c.Wu R.K.Shiue c.chen DepartmentofMaterialsScienceandEngineering TaiwanUniversityTaipei106ChinaTaiwan DepartmentofMaterialsScienceandEngineering DongHwaUniversityHualien974ChinaTaiwan

The ductile to brittle transition temperature (DBTT) of the modified 9cr-1Mo steel and its laser welds was studied. The increase in grain size of the weld structure ascended the DBTT of the steel significantly. The transformation of retained austenite at martensite interlath boundaries into untempered and/or twinned martensite could also contribute to increased DBTTs of the steel and its welds tempered at 540℃.

关键词： 9cr-1Mo钢激光焊接 DBTT 冲击韧性

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ON THE EXPLIcIT DIFFERENTIAL OPERATOR FORMULAE FOR THE OLDROYD RATE TYPE cONSTITUTIVE EQUATION

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Acta Mechanica Sinica 1985年第1期1卷 19-25页

作者： chen Yihong Xu Yuanze (Institute of chemistry,Academia Sinica)chen Wenfang (c.F.chan Man Fong) (Peking University) Institute of chemistry Academia Sinica China Peking University Beijing China

We have established the conditions under which the implicit Oldroyd type constitutiveequation is equivalant to a differential type constitutive *** interpretations of theseconditions are *** some explicit forms for Ma... 详细信息

关键词： rate and differential constitutive equation equivalence Neumann power series parameter expansion

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Dynamic Event-Triggered consensus control for Input constrained Multi-Agent Systems With a Designable Minimum Inter-Event Time

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IEEE/cAA Journal of Automatica Sinica 2024年第3期11卷 649-660页

作者： Meilin Li Yue Long Tieshan Li Hongjing Liang c.L.Philip chen the School of Automation Engineering University of Electronic Science and Technology of ChinaChengdu 611731China IEEE the Yangtze Delta Region Institute University of Electronic Science and Technology of ChinaHuzhou 313000 the Laboratory of Electromagnetic Space cognition and Intelligent control Beijing 100089China the School of computer Science and Engineering South China University of TechnologyGuangzhou 510006

This paper investigates the consensus control of multi-agent systems(MASs) with constrained input using the dynamic event-triggered mechanism(ETM).consider the MASs with small-scale networks where a centralized dynamic ETM with global information of the MASs is first ***,a distributed dynamic ETM which only uses local information is developed for the MASs with large-scale *** is shown that the semi-global consensus of the MASs can be achieved by the designed bounded control protocol where the Zeno phenomenon is eliminated by a designable minimum inter-event *** addition,it is easier to find a trade-off between the convergence rate and the minimum inter-event time by an adjustable ***,the results are extended to regional consensus of the MASs with the bounded control *** simulations show the effectiveness of the proposed approach.

关键词： constrained input designable minimum inter-event time directed communication topology dynamic event-triggered mechanism MASs consensus control

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