Improvement of transport properties in Bi-based superconducting tapes through the modification of precursor powder and heat treatment

Tapes of Ag/Bi2212 (Bi2Sr2CaCu2O8+δ) have been revealed as promising materials for superconducting applications at low temperatures (4.2 K using liquid helium or 20 K using a cryocooler) and high fields (above 10 T). The reaction and formation of phases are related to the ceramic densification and to the alignment of the grains, important for the improvement of the superconductor transport properties. In the present work, it is analyzed the influence of long isotherms at the temperature of 830 °C on the superconducting properties of Ag/Bi2212 samples. The heat treatments consisted of the use of two maximum temperatures of treatment (890 °C and 905 °C), with two different soaking times, both with an annealing isotherm at 830 °C for 5 h, 30 h, and 50 h.

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Effect of Heat Treatment on Transport Critical Current Densities in Ag-Clad Bi-Based Superconducting Tapes

Advances in Cryogenic Engineering Materials ◽

10.1007/978-1-4757-9053-5_25 ◽

1994 ◽

pp. 185-191

Author(s):

Jitsuo Chikaba

Keyword(s):

Heat Treatment ◽

Critical Current ◽

Superconducting Tapes ◽

Current Densities

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Structure and transport properties of (calcium, fluorine) co-doped Y-based superconducting ceramics, effect of heat treatment

physica status solidi (c) ◽

10.1002/pssc.200304462 ◽

2004 ◽

Vol 1 (7) ◽

pp. 1944-1947 ◽

Cited By ~ 2

Author(s):

A. Amira ◽

M.-F. Mosbah ◽

A. Leblanc ◽

P. Molinié ◽

B. Corraze

Keyword(s):

Heat Treatment ◽

Transport Properties ◽

Superconducting Ceramics ◽

Co Doped

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FABRICATION AND CHARACTERIZATION OF Ni-SHEATHED MgB2 SUPERCONDUCTING TAPES

International Journal of Modern Physics B ◽

10.1142/s0217979203016108 ◽

2003 ◽

Vol 17 (04n06) ◽

pp. 461-467 ◽

Cited By ~ 3

Author(s):

A. MALAGOLI ◽

G. GRASSO ◽

A. TUMINO ◽

M. MODICA ◽

V. BRACCINI ◽

...

Keyword(s):

Heat Treatment ◽

Final Heat Treatment ◽

Superconducting Tapes ◽

Final Heat ◽

Nickel Tube ◽

Preparation Route ◽

Working Procedure ◽

The Magnetic Field ◽

Powder In Tube

The preparation route for Nickel-sheathed MgB2 tapes has been studied in order to achieve improved transport properties at temperatures above that of liquid helium. Superconducting tapes have been manufactured by the Powder-In-Tube method, that consists in the cold working of a Nickel tube filled by reacted MgB2 powders, and in a final heat treatment carried out in Argon atmosphere. The could working procedure has been tuned in order to achieve the highest degree of MgB2 density, while limiting the formation of sausaging of the superconducting core cross section. The effect of the final heat treatment has been studied both on the superconducting and microstructural properties of the MgB2 tapes. The critical current of the reacted MgB2 tapes has been measured as a function of the magnetic field and of the temperature on short samples as well as on a small pancake coil. Finally, the microstructural and XRD analyses have revealed the clear presence of a MgB2Ni2.5 reaction layer between the Nickel sheath and the Nickel sheath and the MgB2 superconducting core in the reacted samples.

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