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Flux pinning effect of cubic equiaxed morphology and its Ti stabilizing in Nb_3Sn superconductors

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Science China(Technological Sciences) 2009年第10期52卷 3071-3075页

作者： andre sulpice Jean-Louis SOUBEYROUX Christophe VERWAERDE Gia Ky HOANG NEEL/CNRS-UJF BP 166 38042 Grenoble ALSTOM 3 bis avenue des 3 Chenes 90018 Belfort

Two sets of internal-Sn Nb3Sn superconducting strands were fabricated through RRP method, one with 2 wt% of Ti alloyed in Sn core and the other just pure Sn. Four reaction temperatures of 650℃, 675℃, 700℃ and 725℃ and 128 h duration were applied for A15 phase formation heat treatment after Cu-Sn alloying procedure of 210℃/50 h + 340℃/25 h. For the heat-treated coil samples, transport non-Cu JC was examined through standard 4-probe technique and phase microstructure was observed by means of Field Emission Scanning Electronic Microscope (FESEM). The obtained results demonstrate that the transport critical current density JC of Nb3Sn superconductors is more importantly determined by the cubic equiaxed crystalline morphology than by grain size. Ti addition in Sn stabilizes the cubic equiaxed phase at lower temperature so that heat reaction temperature is effectively reduced, the flux pinning performance is largely reinforced and the transport critical current density JC is substantially promoted.

关键词： internal-Sn Nb3Sn strands cubic equiaxed morphology flux pinning Ti stabilizing transport non-Cu JC

Effect of Static Mgnetic Fields on the Recalescence Behavior of Undercooled Co-Sn Liquid

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Journal of Iron and Steel Research International 2012年第S2期19卷 1076-1080页

作者： WANG Jun BEAUGNON Eric LI Jin-shan HU Rui RIVOIRARD Sophie sulpice andre State Key Laboratory of Solidification Processing Northwestern Polytechnical University CNRS/CRETA 25 rue des martyrs BP16638042 Grenoble CEDEX 9France

The recalescence behavior of undercooled Co-Sn alloys under static magnetic fields was investigated using glass slag fluxing technique in a 12T superconducting *** indicated that the nucleation temperature and the highest temperature after recalescence of undercooled melt can be affected by the static magnetic *** undercooling for Co-Sn alloys keep unchanged when a strong magnetic field was applied while the recalescence extent was reduced. With the increasing Co content for Co-Sn eutectic systems,the effect of the magnetic field on the recalescence was *** find that the magnetic field has very limited effect on the nucleation temperature on alloys while the highest temperature after recalescence is affected by the field depending on the magnetization difference of the undercooled melt before and after solidification.

关键词： Recalescence undercooling magnetic field solidification.

采用中子衍射研究内锡法Nb_3Sn的相形成

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稀有金属材料与工程 2006年第9期35卷 1367-1370页

作者：张超武周廉唐先德 Jean-Louis Soubeyroux andre sulpice 张平祥卢亚峰陕西科技大学西北有色金属研究院陕西西安710016 西北有色金属研究院法国国家科研中心

选取2种ITER用内锡法Nb3Sn复合超导线,采用原位中子衍射测量技术检测超导相的形成过程,通过添加第3种元素研究合金化Sn芯和合金化Nb芯对超导相形成过程及超导线超导性能的影响。结果表明:合金化Sn芯比合金化Nb芯丝有利于提高超导性能;... 详细信息

选取2种ITER用内锡法Nb3Sn复合超导线,采用原位中子衍射测量技术检测超导相的形成过程,通过添加第3种元素研究合金化Sn芯和合金化Nb芯对超导相形成过程及超导线超导性能的影响。结果表明:合金化Sn芯比合金化Nb芯丝有利于提高超导性能;少量添加第3种元素Ti与Sn形成合金能显著促进Sn的扩散和A15相的形成,并且能有效抑制Nb3Sn晶粒的生长,因此增加了晶界面积和钉扎力,增强了超导特性,提高了非铜区临界电流密度Jcn。

关键词： Nb3Sn超导线内锡法中子衍射

无定形碳掺杂对MgB_2/Nb/Cu线材超导电性的影响(英文)

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稀有金属材料与工程 2012年第10期41卷 1709-1712页

作者：王庆阳闫果 andre.sulpice Eric.Mossang 熊晓梅刘国庆焦高峰张平祥西北工业大学陕西西安710072 西北有色金属研究院陕西西安710016 Institute NEEL/CNRS-UJF B.P.16638042 Grenoble Cedex 9France CRETA CNRSBP.16638042 Grenoble Cedex 9France

采用原位法粉末装管工艺(in-situ PIT)制备了无定形碳掺杂MgB2/Nb/Cu超导线材并研究了该掺杂对MgB2微观结构及超导电性的影响。复合线材中以Nb作为阻隔层、Cu作为稳定体并采用冷拉拔工艺进行加工。研究了无定形碳掺杂对MgB2相形成、微... 详细信息

采用原位法粉末装管工艺(in-situ PIT)制备了无定形碳掺杂MgB2/Nb/Cu超导线材并研究了该掺杂对MgB2微观结构及超导电性的影响。复合线材中以Nb作为阻隔层、Cu作为稳定体并采用冷拉拔工艺进行加工。研究了无定形碳掺杂对MgB2相形成、微观结构及超导电性的影响,其中掺杂量分别为MgB2-xCx(x=0.0,0.05,0.08,0.10,0.15)。分别采用XRD、SQUID、SEM/EDS及传输电流测试等方法对MgB2/Nb/Cu线材进行分析测试。XRD分析结果显示,700oC热处理后的线材可以获得纯度较高的MgB2超导相;微观结果照片显示无定形碳掺杂后可以获得良好的晶粒连接性;能谱分析表明掺杂物C元素均匀的分布在MgB2基体中;通过四引线法测试了传输临界电流密度Jc,在4.2K、5T,其Jc值高达1.4×105A/cm2;在4.2K、10T,其Jc值为3.3×104A/cm2。

关键词： MgB2/Nb/Cu超导线材无定形碳掺杂超导电性

内锡法Nb3Sn超导线A15相组成及TC的特征研究(英文)

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低温物理学报 2011年第2期33卷 88-96页

作者：张超武周廉 andre sulpice Jean-Louis Soubeyroux 唐先德陕西科技大学材料学院西北有色金属研究院超导所 NEEL/CNRS-UJF

设计并制备四组不同组成的内锡法Nb3Sn单组元线和两组不同结构设计的多芯线.先将所有样品进行210℃/50hr+340℃/25hr的Cu-Sn合金化热处理,接着进行A15相成相热处理.四组单组元线的成相热处理程序是在675oC,700oC和725℃三种温度下热处理... 详细信息

设计并制备四组不同组成的内锡法Nb3Sn单组元线和两组不同结构设计的多芯线.先将所有样品进行210℃/50hr+340℃/25hr的Cu-Sn合金化热处理,接着进行A15相成相热处理.四组单组元线的成相热处理程序是在675oC,700oC和725℃三种温度下热处理100小时和200小时;而两组多芯线的成相热处理程序是在675℃,675℃,700℃和725℃四种温度下热处理128小时和200小时.将所有热处理样品采用X-射线EDS进行A15相组成分布测定,采用SQUID磁化法测定临界温度TC.所得结果表明,经过足够热处理时间后各种内锡法Nb3Sn超导线的最终A15相组成和TC与热处理温度、导线复合体组成和结构设计以及第三元素的合金化掺杂无关,而是由这种扩散与固相反应的机制本质所决定的.

关键词：内锡法Nb3Sn超导线 A15相组成成相热处理复合体组成与结构设计第三元素掺杂

Magnetization study of ITER-type internal-Sn Nb3Sn superconducting wire

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Chinese Physics B 2007年第6期16卷 1764-1769页

作者：张超武周廉 andre sulpice Jean-Louis Soubeyroux Christophe Verwaerde GiaKy Hoang 张平祥卢亚峰唐先德 Shaanxi University of Science and Technology Xi'an 710021 China Northwest Institute for Nonferrous Metal Research Xi'an 710016 China CNRS/CRETA BP 166 38042 Grenoble France ALSTOM 3 bis avenue des 3 Chenes 90018 Belfort France

Through magnetization measurement with a SQUID magnetometer the heat treatment optimization of an international thermonuclear experimental reactor （ITER）-type internal-Sn Nb3Sn superconducting wire has been investigated. The irreversibility temperature T^＊（H）, which is mainly dependent on A15 phase composition, was obtained by a warming and cooling cycle at a fixed field. The hysteresis width △M（H） which reflects the flux pinning situation of the A15 phase is determined by the sweeping of magnetic field at a constant temperature. The results obtained from differently heat-treated samples show that the combination of T^＊（H） with AM（H） measurement is very effective for optimizing the heat reaction process. The heat treatment condition of the ITER-type wire is optimized at 675℃/128 h, which results in a composition closer to stoichiometric Nb3Sn and a state with best flux pinning.

关键词： Nb3Sn superconducting wire internal-Sn process irreversibility temperature,hysteresis width

内锡法Nb3 Sn超导线材的A15相成相动力学研究（英文）

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低温物理学报 2009年第1期31卷 1-6页

作者：张超武周廉唐先德 andre sulpice Jean-Louis Soubeyroux 张平祥卢亚峰陕西科技大学材料学院西北有色金属研究院法国国家科研中心CNRS/CRETA

为研究Nb3Sn超导材料的A15相成相动力学,设计并制备了四组单组元内锡法(MEIT)超导线。这四组MEIT导线设计了不同的Sn/Cu比,并在一组导线中合金化掺杂了1at%Zr。所有导线样品先经历210°C/50hr+340°C/25hr的Cu-Sn合金化热处理,然后进行... 详细信息

为研究Nb3Sn超导材料的A15相成相动力学,设计并制备了四组单组元内锡法(MEIT)超导线。这四组MEIT导线设计了不同的Sn/Cu比,并在一组导线中合金化掺杂了1at%Zr。所有导线样品先经历210°C/50hr+340°C/25hr的Cu-Sn合金化热处理,然后进行A15相成相热处理。选择四种反应温度:650℃,675℃,700℃和725℃,以研究成相热处理温度和时间的影响。用SEM技术测定所有热处理样品的A15相层厚,然后对不同温度下的热处理时间作图,并进行非线性拟合。所得结果表明四种因素促进了A15相的增长:增加反应温度,延长反应时间,增大Sn/Cu比率和合金化掺杂Zr;内锡法Nb3Sn超导线材的成相动力学服从Yn=K(T)t变化关系,A15相生长指数n值受热处理温度和Zr掺杂的影响.

关键词： Nb3Sn超导线单组元内锡法(MEIT) Sn/Cu比 Zr合金化掺杂 A15相成相动力学

ITER用内锡法Nb3Sn超导线材的不可逆温度研究(英文)

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低温物理学报 2006年第4期28卷 311-315页

作者：张超武 andre sulpice 周廉唐先德 Jean-Louis oubeyroux 张平祥卢亚峰陕西科技大学 2. 法国国家科研中心(CNRS) 西北有色金属研究院

本文采用超导量子干涉仪(SQUID)测定了一种国际热核聚变实验堆(ITER)项目用内锡法Nb3Sn超导线材的不可逆温度,测量方法是在恒定磁场下循环温度,即将温度以一定间隔从10K上升到20K,然后再返回到10K,测定磁矩的偏离温度.所得结果可用于从... 详细信息

本文采用超导量子干涉仪(SQUID)测定了一种国际热核聚变实验堆(ITER)项目用内锡法Nb3Sn超导线材的不可逆温度,测量方法是在恒定磁场下循环温度,即将温度以一定间隔从10K上升到20K,然后再返回到10K,测定磁矩的偏离温度.所得结果可用于从生成最佳Nb-Sn相组成方面来优化A15相成相热处理制度.本研究得出的结论是,对于像ITER使用的高场磁体超导线来说,鉴于其需要在较高磁场下有高的临界电流密度,就需要将超导线的热处理温度适当提高一些.本实验所用Nb3Sn超导线材的最适宜热处理制度为675°C/128小时,这样可以得到最佳不可逆温度特性,即最佳的A15相组成.

关键词： Nb3Sn超导线材不可逆温度 ITER工程内锡法

DEM parameter calibration of cohesive bulk materials using a simple angle of repose test

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Particuology 2019年第4期17卷 105-115页

作者： Thomas Roessler andre Katterfeld Chair of Material Handling Institute of Logistics and Material Handling Systems University of Magdeburg Universitatsplatz 239106 Magdeburg Germany

The numerical effort of discrete element method (DEM) simulations results in a general idealisation of DEM models that makes the calibration crucial to obtaining realistic simulation results. The angle of repose test has become a standard test for the calibration of DEM parameters of cohesionless bulk materials and is extensively discussed in the literature. One of the most used test methods is the pull-up test of a hollow cylinder filled with bulk material. This paper presents how this basic pull-up test can also be used for the calibration of DEM parameters of cohesive materials by changing the analysis criteria. In contrast to analysing the static angle of repose, the focus lies on the macroscopic flow behaviour during the lifting of the cylinder. Reproducible phases of flow are identified in experiments: the build-up of a stable bulk material column, the convex bending of the column, and the beginning of collapse of the column. Furthermore, the phases are independent of the size and lifting velocity. The convex bending of the bulk-material column combined with the moment of first collapse are introduced as new measurable calibration criteria. These experimental results of wet sand are used for the calibration of related DEM parameters using a simplified JKR cohesion model. The DEM calibration including an analysis algorithm that fits the experimental flow behaviour and the final selection of the relevant parameters (i.e., sliding friction coefficient, rolling friction coefficient, and cohesion energy density) is presented in detail.

关键词： Discrete element method Angle of repose Cohesive bulk material Calibration