Application of two-axial rolling for multicore Bi(2223)/Ag tapes
Application of two-axial rolling for multicore Bi(2223)/Ag tapes
复制标题
双轴轧制多芯Bi(2223)/Ag带材的应用
DOI：
10.1088/0953-2048/10/12/025
复制
发表时间：
1997
影响因子：
3.6
通讯作者：
Ľ. Kopera
中科院分区：
文献类型：
--
作者：
P. Kováč;I. Hušek;Ľ. Kopera
采用“土耳其头”主动轧辊进行双轴轧制变形的氧化物粉末装管（OPIT）技术制备了多芯银包套Bi(2223)带材。与拉丝工艺相比，该技术可避免复合变形过程中的拉应力，并提高Bi(2223)芯的密度。通过双轴轧制获得了更好的丝材均匀性。对单芯和36芯矩形线材及带材测量了传输临界电流及其角度依赖性。带材的总展宽对传输电流密度有显著影响，但在0.1 T和77 K下的各向异性仅受轻微影响。在单芯线材中测量到各向异性降低，该线材在两个垂直轧制平面上有晶粒织构。
Multicore Ag-sheathed Bi(2223) tapes have been prepared by OPIT technique using the two-axial rolling deformation by active `Turk's head' roller. In comparison to wire drawing, the presented technique allows one to avoid the tensile stress during composite deformation and to increase the BSCCO-core density. A better homogeneity of filaments has been obtained by two-axial rolling. The transport critical current and its angular dependencies have been measured for single and 36 filament rectangular wires and tapes. Total tape widening influences the transport current density considerably but anisotropy at 0.1 T and 77 K is affected only slightly. Reduced anisotropy has been measured in a single core wire which has texturing of grains in two perpendicular rolling planes.