Effect of cold rolling on microstructure, grain alignment, and transport critical current anisotropy of silver clad (Bi, Pb)2Sr2Ca2Cu3Oxsuperconducting tapes

1991 ◽  
Vol 4 (1S) ◽  
pp. S361-S363 ◽  
Author(s):  
Wai Lo ◽  
B A Glowacki
Keyword(s):  
Cold Rolling ◽  
Critical Current ◽  
Grain Alignment

scholarly journals Cold sintering of YBa2Cu3O7−δ

RSC Advances ◽  
2019 ◽  
Vol 9 (70) ◽  
pp. 40917-40923
Author(s):  
James Cockburn ◽  
Rebecca Boston
Keyword(s):  
Critical Current ◽  
Grain Alignment ◽  
Current Densities

Cold sintered superconducting YBa2Cu3O7−δ densified at 180 °C shows enhanced critical current densities by exploiting grain alignment created during pressing.

Improved critical current in MgB2 tapes sheathed with carbon steels

2002 ◽  
Vol 17 (9) ◽  
pp. 2339-2345 ◽  
Author(s):  
H. Fujii ◽  
H. Kumakura ◽  
K. Togano
Keyword(s):  
Heat Treatment ◽  
Mechanical Strength ◽  
Critical Current ◽  
Carbon Steels ◽  
Transport Critical Current Density ◽  
Small Field ◽  
High Mechanical Strength ◽  
Grain Alignment ◽  
Heat Treated ◽  
Powder In Tube

We fabricated MgB2 tapes by a powder-in-tube method using sheath materials of Fe and carbon steel (CS). In the as-rolled state, the CS-sheathed tapes showed higher transport critical current density (Jc) values than the Fe-sheathed tape did. This is due to the higher-density MgB2 layer associated with the high mechanical strength of the CS. Furthermore, heat treatment above 800 °C was very effective in increasing the Jc of these tapes. The heat-treated CS-sheathed tapes showed Jc values of 10 kA/cm2 at 4.2 K and 7.5 T and still above 2 kA/cm2 at 10 T. These values are the highest ever reported for MgB2 tapes. An extrapolation to 0 T in the Jc-B data gave about 1 MA/cm2, which was independent of the sheath materials. Microstructural observations suggest that the high Jc and the small field dependence of the Jc properties of the CS-sheathed tapes can be ascribed to the improved grain connectivity and grain alignment produced by the high mechanical strength of CS.

Influence of Ag substrates on grain alignment and critical current density of Bi-2212 tape conductors

1999 ◽  
Vol 9 (2) ◽  
pp. 1804-1807 ◽  
Author(s):  
H. Kumakura ◽  
H. Kitaguchi ◽  
K. Togano ◽  
T. Muroga ◽  
J. Sato ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Grain Alignment

Critical Current Properties and Microstructures of Ag-Sheathed Bi-Based Superconducting Wires

MRS Bulletin ◽  
1992 ◽  
Vol 17 (8) ◽  
pp. 52-54 ◽  
Author(s):  
T. Kato ◽  
T. Hikata ◽  
M. Ueyama ◽  
K. Sato ◽  
Y. Iwasa
Keyword(s):  
Critical Temperature ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Deformation Process ◽  
High Critical Current Density ◽  
Grain Alignment ◽  
Bscco System ◽  
Superconducting Wires ◽  
Powder In Tube

Since the first report of superconductivity in the Bi-Sr-Ca-Cu-O (BSCCO) system by Maeda et al., an enormous quantity of material work has been reported on the Bi system. The Bi-2223 phase exhibits a zero-resistivity temperature of around 110 K and this is the highest critical temperature outside the 125 K critical temperature found in the Tl-Ba-Ca-Cu-O system. The layered BSCCO phases cleave easily, making it possible to align grains by a deformation process.The powder-in-tube method is one of the fabrication processes that permits grain alignment and the achievement of high critical current density. This tendency is particularly strong for the 2223-BSCCO phase.In this paper, we report on the relation between the critical current density (Jc) and the microstructure in silver-sheathed Bi-Pb-Sr-Ca-Cu-0 (2223) wires produced by the powder-in-tube method.

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