Evaluation of critical current density and residual resistance ratio limits in powder in tube Nb3Sn conductors

The present study focuses on the preparation of good quality MgB2 superconductor in bulk, wire/tape forms and on the improvement of in-field critical current density [JC(H)]. MgB2 bulk superconductor was prepared by a simple Powder-In-Sealed-Tube (PIST) method and MgB2 wires and tapes were prepared by the Powder-In-Tube (PIT) method. A novel electrical self-heating method was introduced for the preparation of Fe sheathed MgB2 wires and tapes. Burned Rice Husk (BRH), an inexpensive natural material is found to be one of the best additives for enhancing the in-field critical current density of MgB2. By selecting suitable combinations of additives a significant enhancement of the critical current density by 1-2 orders of magnitude were achieved for fields > 5 T, at 5-15 K.

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Effect of Co0.5Ni0.5Fe2O4 Nanoparticles Addition in Ag-Sheathed Bi-2223 Superconductor Tapes Prepared by Co-Precipitation Method

Materials Science Forum ◽

10.4028/www.scientific.net/msf.981.59 ◽

2020 ◽

Vol 981 ◽

pp. 59-65

Author(s):

Muhammad Hafiz Mazwir ◽

Bryan Andrew Balasan ◽

Farah Hanani Zulkifli ◽

Roslan Abd-Shukor

Keyword(s):

Critical Current Density ◽

Critical Current ◽

Current Density ◽

Precipitation Method ◽

X Ray Diffraction ◽

Magnetic Oxide ◽

Pinning Centers ◽

X Ray ◽

Co Precipitation ◽

Powder In Tube

Effect of complex magnetic oxide Co0.5Ni0.5Fe2O4 (CNFO) nanoparticles addition in (Bi1.6Pb0.4)Sr2Ca2Cu3O10 (Bi-2223) superconductor tapes was investigated. Ultrafine Bi-2223 powder precursor was prepared via co-precipitation method and was added with 0.01 – 0.05 wt.% Co0.5Ni0.5Fe2O4 nanoparticles during the final heating stage. The sample with 0.01 wt.% addition, Bi-2223(CNFO)0.01 was found to have the highest critical current density, Jc. This sample were then chosen to be fabricated into Ag-sheathed superconductor tapes using the powder-in-tube (PIT) method. The tapes were sintered for 50 and 100 h at 845 °C. The phase, microstructure and Jc of the samples were determined by powder X-ray diffraction (XRD), scanning electron microscopy (SEM) and four point probe, respectively. Jc of Ag-sheathed Bi-2223(CNFO)0.01 tapes sintered for 100 h was 19830 A/cm2 at 30 K and 3970 A/cm2 at 77 K compared to tapes without addition which showed a much lower Jc(6370 A/cm2 at 30 K). This study showed that CNFO nanoparticles could act as an effective flux pinning centers to enhance the critical current density in the Bi-2223 superconductor.

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High critical current density in Ti-doped MgB2/Ta/Cu tape by powder-in-tube process

Journal of Applied Physics ◽

10.1063/1.1520725 ◽

2002 ◽

Vol 92 (12) ◽

pp. 7341-7344 ◽

Cited By ~ 24

Author(s):

B. Q. Fu ◽

Y. Feng ◽

G. Yan ◽

Y. Zhao ◽

A. K. Pradhan ◽

...

Keyword(s):

Critical Current Density ◽

Critical Current ◽

Current Density ◽

High Critical Current Density ◽

Doped Mgb2 ◽

Powder In Tube

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Critical current density and pinning behaviour of mono-core MgB2 wires prepared by internal magnesium diffusion and in-situ powder-in-tube method

Physica C Superconductivity ◽

10.1016/j.physc.2014.07.003 ◽

2014 ◽

Vol 505 ◽

pp. 39-43 ◽

Cited By ~ 13

Author(s):

Boris Brunner ◽

Pavol Kováč ◽

Michael Reissner ◽

Imrich Hušek ◽

Tibor Melišek ◽

...

Keyword(s):

Critical Current Density ◽

Critical Current ◽

Current Density ◽

Mgb2 Wires ◽

Powder In Tube

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Irreversibility field and critical current density as a function of heat treatment time and temperature for a pure niobium powder-in-tube Nb[sub 3]Sn conductor

10.1063/1.1472643 ◽

2002 ◽

Cited By ~ 11

Author(s):

C. M. Fischer

Keyword(s):

Heat Treatment ◽

Critical Current Density ◽

Critical Current ◽

Current Density ◽

Treatment Time ◽

Heat Treatment Time ◽

Irreversibility Field ◽

Niobium Powder ◽

Pure Niobium ◽

Powder In Tube

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Effect of sintering temperature and cooling rate on microstructure, phase formation, and critical current density of Ag-sheathed Bi1.8Pb0.4Sr2Ca2Cu3Ox superconducting tapes

Journal of Materials Research ◽

10.1557/jmr.1998.0036 ◽

1998 ◽

Vol 13 (2) ◽

pp. 261-268 ◽

Cited By ~ 11

Author(s):

J. P. Singh ◽

N. Vasanthamohan

Keyword(s):

Critical Current Density ◽

Cooling Rate ◽

Critical Current ◽

Current Density ◽

Sintering Temperature ◽

Superconducting Tapes ◽

Temperature Quenching ◽

Slow Cooling ◽

Higher Temperature ◽

Powder In Tube

Silver-sheathed Bi–Pb–Sr–Ca–Cu–O (2223) superconducting tapes (with a starting composition of Bi1.8Pb0.4Sr2Ca1Cu2O8, calcium cuprate, and CuO) were fabricated by the powder-in-tube technique. The tapes were sintered at various temperatures to optimize the formation of Bi1.8Pb0.4Sr2Ca2Cu3O10 phase within the tape. The results show that sintering within the temperature range of 815–825 °C can produce tapes with high critical current density (Jc). The Jc of samples sintered at the higher temperature of 825 °C, where more liquid is present, depended markedly on the rate at which tapes were cooled from the sintering temperature; samples sintered at lower temperatures did not exhibit such a cooling-rate effect. The optimum combination of phase purity and microstructure that yielded an average transport Jc of ≥ 2.5 × 104 A/cm2 was obtained when the tapes were sintered at 825 °C for 150 h and cooled at a rate of 25 °C/h from the sintering temperature. Quenching studies indicate that the Bi-2223 phase becomes unstable below 700 °C during slow cooling. This result may have important implications for processing Bi–Sr–Ca–Cu–O tapes with high Jc. Addition of 15 vol.% Ag flakes to the monolithic core exerted no significant effect on Jc.

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Highly c-axis orientated superconducting core and large critical current density in Ba0.6Na0.4Fe2As2 powder-in-tube tape

Scientific Reports ◽

10.1038/s41598-019-49363-y ◽

2019 ◽

Vol 9 (1) ◽

Cited By ~ 4

Author(s):

S. Imai ◽

S. Itou ◽

S. Ishida ◽

Y. Tsuchiya ◽

A. Iyo ◽

...

Keyword(s):

Critical Current Density ◽

Critical Current ◽

Current Density ◽

X Ray Diffraction ◽

Axis Orientation ◽

X Ray ◽

Superconducting Wires ◽

Superconducting Tape ◽

Key Issues ◽

Powder In Tube

Abstract Improvement of the critical current density (Jc) of superconducting wires/tapes is one of the key issues in the field of superconductivity applications. Here we report the fabrication of a silver-sheathed Ba1−xNaxFe2As2 (BaNa-122) superconducting tape by using a powder-in-tube technique and its superconducting properties, in particular transport Jc, as well as the tape-core texture. The optimally-doped BaNa-122 tape with Na concentration x = 0.4 exhibits the superconducting critical temperature (Tc) of 33.7 K and high transport Jc of 4 × 104 A/cm2 at 4.2 K in a magnetic field of 4 T. Patterns of x-ray diffraction for the superconducting core show that the degree of c-axis orientation is significantly enhanced through the tape fabrication process. The tendency of c-axis orientation is advantageous for achieving higher Jc, suggesting the high potential of BaNa-122 for superconducting wire/tape applications.

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