Abstract
The effects of nanoparticle additions, rolling, and sintering time on the transport critical current density, Jc, of Ag-sheathed Bi1.6Pb0.4Sr2Ca2Cu3O10 (Bi-2223) are reported. Nanosized PbO (20–30 nm) with 0.05 wt. % and MgO (20 nm) with 0.1 wt. % were added to Bi-2223 superconductor powders. The powders were packed into Ag tubes and deformed into tapes by drawing, sintering, and rolling steps. The Jc with two sintering time (100 h and 150 h) and two rolling processes was measured using the four-probe method between 30 and 77 K in self-field, and at 77 K in magnetic fields from 0 and 0.75 T. The effect of nanosized PbO and MgO and processing on the microstructure, phase, and Jc were examined. The effects of rolling versus no rolling on Jc were also compared. PbO-added tapes showed a higher Jc compared with MgO-added tapes which indicated that PbO enhanced the flux pinning capability more than MgO. Jc of PbO-added tapes obtained in the first rolling and sintered for 100 h was 28000 A/cm2 and 6000 A/cm2 at 30 K and 77 K, respectively. Jc of MgO-added tapes in the first rolling and sintered for 100 h was 17500 A/cm2 and 1500 A/cm2 at 30 K and 77 K, respectively. Intermediate rolling introduced more cracks than can be healed in the subsequent heat treatment. In the second rolling, the tapes developed more cracks, voids, and loose microstructure where the grains were not well connected. These results showed that further sintering time increased Jc, but further rolling decreased Jc of the PbO- and MgO-added Bi-2223 tapes.
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Acknowledgements
Nabil A. A. Yahya and Ahmed Abdulrab Ali Ebrahim wish to thank the Scholar Rescue Fund, Institute of International Education (IIE-SRF), New York, USA, for the support.
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This work was also supported by Thamar University, Thamar, Yemen; The Ministry of Higher Education, Malaysia (FRGS/1/2020/STG07/UKM/01/1); and American University in Cairo, Egypt.
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Nabil A. A. Yahya prepared the superconductor tapes, performed the characterizations, and analyzed the data. Ahmed Abdulrab Ali Ebrahim and Mohamad A. Swillam performed the characterizations and initial data analysis. R. Abd-Shukor designed the experiment, analyzed the data, and wrote the paper.
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Yahya, N.A.A., Ebrahim, A.A.A., Swillam, M.A. et al. Effects of Nanosized PbO and MgO, Rolling, and Sintering Time on Crack and Current Density of Bi1.6Pb0.4Sr2Ca2Cu3O10/Ag Superconductor Tapes. J Supercond Nov Magn 35, 2293–2300 (2022). https://doi.org/10.1007/s10948-022-06231-7
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DOI: https://doi.org/10.1007/s10948-022-06231-7