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Numerical Simulation of Magnetic Field Distribution in Aluminum Melting Furnace With Electromagnetic Stirring

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Journal of Iron and Steel Research International 2012年第S1期19卷 179-182页

作者： CHEN Hong WU li WANG Tong-min CAO Zhi-qiang li ting-ju School of Materials Science and Engineering Dalian University of Technology

In metallurgical processing,effective and reliable electromagnetic stirring of the melt is one of the prerequisites for higher productivity and improved process *** structure and electrical parameters of the stirrer are greatly significant on improving and enhancing the stirring *** this paper,ANSYS software is used to research the effect of stirrer parameters on magnetic field distribution in aluminum melting *** results show that magnetic flux density distributes as two humps at the direction(X)of metal *** flux density distributes as a hump at the direction(Z)of metal width,reaches its maximum at the pool center and decays gradually toward the *** is also demonstrated that magnetic flux density increases by 2.65mT,as kilo-ampere-turns increase by *** center distance between two coils changes the distribution of magnetic flux density rather than its magnitude,while the distance from coils to the bottom of molten aluminum changes the magnitude of magnetic flux density but no change of distribution.

关键词： numerical simulation electromagnetic stirring aluminum melting furnace

掺杂基liFe_(0．99)M_(0．01)PO_4／C的制备及结构与性能的研究

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无机材料学报 2006年第4期21卷 880-884页

作者：杨书廷李廷举大连理工大学材料系

以往的研究证实,采用PALM模板合成法合成的liFePO4／C复合材料,具有颗粒尺寸小,倍率放电性能好,电化学比容量较高等特点．本文在此基础上对复合材料进行体相掺杂高价金属离子,所得掺杂基liFe0．99M0．01PO4／C(M=Nd3+、Co3+、Cr3+、Mn3+... 详细信息

以往的研究证实,采用PALM模板合成法合成的liFePO4／C复合材料,具有颗粒尺寸小,倍率放电性能好,电化学比容量较高等特点．本文在此基础上对复合材料进行体相掺杂高价金属离子,所得掺杂基liFe0．99M0．01PO4／C(M=Nd3+、Co3+、Cr3+、Mn3+)改性材料的比容量有了进一步提高．研究结果表明,C／3充放电时,复合liFePO4／C的容量为108mAh·g-1,而掺杂基liFe0．99M0.01PO4／C的比容量分别提高到140、129、120和115mAh·G-1,而且循环性能也非常稳定．电导率研究表明,体相掺杂使得体相电导率提高了5到7个数量级,与文献值较为接近．XRD衍射图谱表明,掺杂后各个材料的结构依然保持有序的橄榄石结构．

关键词：锂离子电池正极材料 liFePO4 掺杂

Microstructure Evolution of Hypoeutectic Al-Si Alloy With Electromagnetic Stirring and Ultrasonic Treatment

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Journal of Iron and Steel Research International 2012年第S1期19卷 212-216页

作者： ZHANG Yu-bo FU Ying WANG Tong-min CAO Zhi-qiang li ting-ju School of Materials Science and Engineering Dalian University of Technology

Effects of electromagnetic stirring(EMS),ultrasonic treatment(UST)and the combination of EMS and UST(EU)on solidification structure were investigated in hypoeutectic A1-Si *** results indicate that EMS,UST and EU can refine primary u-A1 and modify eutectic silicon by influencing their nucleation and growth *** can fracture the dendrite arms and lead to decrease of primary α-Al grain *** also changes the morphology of eutectic silicon and widens the separation of silicon *** UST,the cavitation and acoustic streaming are the principal reasons for the microstructure refinement,which enhance the undercooled and heterogeneous *** has combined the features of EMS and UST,hence obtains the best effect on the microstructure *** refinement of primary α-Al and evident modification of eutectic silicon are observed with *** addition,the mechanism of morphological evolution with EU was preliminarily discussed.

关键词： electromagnetic stirring ultrasonic treatment Al-Si alloy microstructure

Modification of Solidification Structure Under DC Pulse Magnetic Field

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Journal of Iron and Steel Research International 2012年第S1期19卷 226-228页

作者： FU Ying Park Joonpyo WANG Tong-min Kim Jongho CAO Zhi-qiang li ting-ju School of Materials Science and Engineering Dalian University of Technology Research Institute of Industrial Science and Technology(RIST) Pohang 790-600Korea

A new process using direct current pulsed magnetic field for modification of solidification structure of pure aluminium has been *** experimental results show that the fine equiaxed crystal zone exists at the bottom o... 详细信息

关键词： DC-Pulsed magnetic field pure aluminum grain refinement

Preparation of 3003/4045 Cladding Hollow Billets by Horizontal Electromagnetic Continuous Casting

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Journal of Iron and Steel Research International 2012年第S2期19卷 896-899页

作者： liU Ning ZHANG Peng-chao JIE Jin-chuan CAO Zhi-qiang WANG Tong-min li ting-ju School of Materials Science and Engineering Dalian University of Technology

The 3003/4045 aluminum alloys cladding hollow billets with the diameter of 60 mm and external thickness of 3 mm are fabricated by horizontal electromagnetic continuous *** surface features of ingots and microstructures of the bonding interface are *** results show that cladding hollow billets combine the external and internal layers by metallurgical bonding without mixing when the pouring temperature of the external liquid metal is 903 *** diffusion region with the thickness of 25 μm can be seen clearly,where mutual diffusion of Si and Mn atoms takes place. In addition,the intermetallic compound Al_(12)(FeMn)_3Si_2 is formed in the interface.

关键词： 3003/4045 clading hollow billets Horizontal electromagnetic continuous casting Interface

磷对浮动催化裂解法制备单壁碳纳米管产率和直径的影响

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功能材料 2007年第4期38卷 662-664页

作者：张保庭温斌李廷举大连理工大学三束材料改性国家重点实验室及材料科学与工程学院辽宁大连116024

采用浮动催化裂解法研究了磷作为促进剂对SWNTs制备的影响。实验表明,在SWNTs的制备过程中添加适量的磷促进剂可以大幅度提高SWNTs的产率;采用扫描电子显微镜(SEM),透射电子显微镜(TEM)和拉曼光谱(Raman spectroscopy)对产物进行微观结... 详细信息

采用浮动催化裂解法研究了磷作为促进剂对SWNTs制备的影响。实验表明,在SWNTs的制备过程中添加适量的磷促进剂可以大幅度提高SWNTs的产率;采用扫描电子显微镜(SEM),透射电子显微镜(TEM)和拉曼光谱(Raman spectroscopy)对产物进行微观结构分析,发现磷有利于较小管径SWNTs的合成。根据表征结果推测SWNTs以Yar- mulke帽模型生长。适量的添加磷的能有效的提高纳米铁颗粒的催化活性,促进Yarmulke帽的形成。

关键词：磷 SWNTs 浮动催化裂解法 Yarmulke

Numerical Simulation of the Electromagnetic Continuous Casting for Clad Slab

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Journal of Iron and Steel Research International 2012年第S1期19卷 153-157页

作者： YU Ying-shui WANG Tong-min SUN Jian-bo JIE Jin-chuan CAO Zhi-qiang li ting-ju School of Materials Science and Engineering Dalian University of Technology School of Materials Science and Engineering Jiamusi University

In this paper,a new electromagnetic continuous casting process to prepare clad slab is *** influence of level direct current electromagnetic field on temperature and flow fields of the melt during the fabrication of clad slab were numerically studied by the engineering software ANSYS and *** results indicated that when the magnetic flux density(B)was 0.15 T,the impact velocity and distance of the flow to the narrow face and underside of the dividing plate decreased *** the flow impact to the liquid pool was *** the same time,the high temperature zone of the melt moved away from the narrow face and the dividing plate,and distributed more uniformly. The wider semi-solid area next to the dividing plate was useful for 3003 and 4004 aluminum alloys to bond.

关键词： clad slab electromagnetic continuous casting numerical simulation

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强磁场对铝硅合金变质效果的影响

大连海事大学学报 2007年第2期33卷 7-11页

作者：连峰李廷举大连海事大学机电与材料工程学院辽宁大连116026 大连理工大学材料工程学院辽宁大连116024

为解决Al-Si合金存在的Na变质重熔失效和有效时间短及P变质处理后初晶Si偏聚问题,利用施加强磁场的方法,分别对亚共晶Al-6%Si合金和共晶Al-12.6%Si合金进行Na盐变质处理,对过共晶Al-18%Si合金进行P盐变质处理.结果发现对于亚共晶Al-6%S... 详细信息

为解决Al-Si合金存在的Na变质重熔失效和有效时间短及P变质处理后初晶Si偏聚问题,利用施加强磁场的方法,分别对亚共晶Al-6%Si合金和共晶Al-12.6%Si合金进行Na盐变质处理,对过共晶Al-18%Si合金进行P盐变质处理.结果发现对于亚共晶Al-6%Si合金,施加强磁场的条件下重熔,Na变质没有失效;对于共晶Al-12.6%Si合金,施加强磁场延长了变质有效时间;对于过共晶Al-18%Si合金,施加强磁场使凝固组织中的初晶Si相均匀分布.强磁场有助于改善Al-Si合金的变质效果.

关键词：强磁场铝硅合金变质处理共晶Si 初晶Si

In-Situ Observation of Dendrite Growth During Solidification of Al-10wt.%Cu Alloy Under Pulsed Magnetic Field

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Journal of Iron and Steel Research International 2012年第S1期19卷 229-232页

作者： CAO Fei ZHU Jing WANG Tong-min FU Ya-nan XIE Hong-lan CAO Zhi-qiang li ting-ju School of Materials Science and Engineering Dalian University of Technology Shanghai Synchrotron Radiation Facility Shanghai Institute of Applied Physics

Time-resolved X-ray imaging with intense,high brightness and monochromatic third-generation synchrotron radiation,and a high-resolution fast-readout charge coupled device(CCD)system have been used to in-situ observe the dendrite growth of a solidifying Al-10wt.%Cu alloy under pulsed magnetic *** imaging results indicate that the secondary dendrite tip growth underwent a rapid deceleration once the pulsed magnetic field was *** remelting phenomenon of small dendrites was also observed when applying the pulsed magnetic field at the beginning of *** is related to the Joule heat effect caused by the imposed pulsed magnetic ***,fragmentation of the dendrites usually caused by the forced convection induced by pulsed magnetic field was not found in the present work.

关键词： synchrotron radiation aluminum alloy solidification pulsed magnetic field