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Improved Superconducting Properties for Multifilament Graphene-Coated Nb Addition MgB2 Wires by an Internal Mg Diffusion Process

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Abstract

A novel method is presented for the production of the 6 + 1 filament MgB2 wires using internal Mg diffusion (IMD) process. For the MgB2 long wire with 1.4-mm diameter produced by graphene-coated Nb addition, the critical current (Ic) is about 1000 A at 4 T and 4.2 K, which is 2.5 times higher than that of the undoped sample. The increased Ic is attributed to the enhanced flux pinning force and improved grain connectivity. The obtained results show that graphene-coated Nb addition MgB2 wires have excellent superconductivity and mechanical property compared with the conventional PIT wires in practical application.

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Funding

This work was financially supported by the Shandong Jiaotong University doctoral research fund (BS201901039), National Natural Science Foundation (NO. 51772250).

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Authors and Affiliations

  1. Shandong Jiaotong University, Ji’nan 250300, China

    H. R. Liu & Z. W. Xie

  2. Northwest Institute for Nonferrous Metal Research, Xi’an 710016, China

    F. Yang, L. H. Jin, Q. Y. Wang, X. M. Xiong, J. Q. Feng, C. S. Li & L. Zhou

  3. Shandong Mingde Machinery Co, Ltd, Ji’ning, China

    F. G. Han

  4. Northwestern Polytechnical University, Xi’an, 710072, China

    H. R. Liu & K. Z. Li

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  1. H. R. Liu
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  2. F. Yang
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  3. F. G. Han
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  4. Z. W. Xie
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  5. L. H. Jin
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  6. Q. Y. Wang
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  7. X. M. Xiong
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  8. J. Q. Feng
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  9. C. S. Li
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  10. K. Z. Li
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  11. L. Zhou
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Correspondence to F. Yang.

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Liu, H.R., Yang, F., Han, F.G. et al. Improved Superconducting Properties for Multifilament Graphene-Coated Nb Addition MgB2 Wires by an Internal Mg Diffusion Process. J Supercond Nov Magn 35, 429–434 (2022). https://doi.org/10.1007/s10948-021-06081-9

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  • DOI: https://doi.org/10.1007/s10948-021-06081-9

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