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Impact of hot isostatic pressing on the microstructure and current-carrying capacity of Bi-2212 wires

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Abstract

We have successfully utilized an hot isostatic pressing (HIP) technique to fabricate Bi2Sr2CaCu2O8+δ (Bi-2212) wires under 50 bar pressure, resulting in a significant enhancement of their current-carrying capacity by nearly 2.5 times. Our study compares the microstructure and superconducting properties of the wires processed under HIP and atmospheric pressure. The results demonstrate that the critical current density (JC) of the wires treated with HIP increases from 1416 A mm−2 (at 1 bar) to 3592 A mm−2 at 4.2 K and 5 T. Initially, this increase was attributed to the reduction of void regions in the wires treated under 50 bar HIP. However, further analysis revealed that the decrease in voids resulting from HIP only accounts for 23% of the total increase in JC, implying that density improvement plays a minor role in the overall JC enhancement. In comparison to the wires processed under atmospheric pressure, the current-carrying ability of the wires treated with HIP is significantly enhanced due to the combined effect of void reduction and the dendritic structure surrounding the Bi-2212 filaments. By increasing the cooling rate from 2.5 h−1 to 5 °C h−1, we further increased the engineering critical current density (JE) of the Bi-2212 wires by 20%, reaching 975 A mm−2 (at 4.2 K and 5 T). This improvement is attributed to the effective reduction of the dendritic structure surrounding the filaments in the wires treated under 50 bar HIP, achieved by adjusting the grain growth rate during the cooling process. These findings provide valuable insights for the development of high-performance Bi-2212 wires for superconducting applications.

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Data availability

The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

This research was by National Natural Science Foundation of China (No. 52277029), Nation Key R&D Program of China (No. 2021YFB3800201), Major Science and technology projects of Shaanxi Province (Nos. 2020zdzx04-04-02 and 2024GX-YBXM-403), Shaanxi Natural Science Foundation Project (No.2020JM-650).

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Authors and Affiliations

  1. Superconducting Materials Research Center, Northwest Institute for Non-ferrous Metal Research, Xi’an, 710016, People’s Republic of China

    Qingbin Hao, Xiaoyan Xu, Gaofeng Jiao, Kai Yao, Guoqing Liu & Chengshan Li

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  1. Qingbin Hao
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  2. Xiaoyan Xu
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  3. Gaofeng Jiao
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Contributions

All authors contributed to the conception and design of the study. [Xiaoyan Xu], [Qingbin Hao], [Gaofeng Jiao], [Kai Yao], and [Guoqing Liu] were involved in sample preparation. Data analysis was performed by [Xiaoyan Xu] and [Qingbin Hao]. The initial draft of the manuscript was revised by [Qingbin Hao] and [Xiaoyan Xu], and the entire process was supervised by [Chengshan Li]. All authors read and approved the final manuscript.

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Correspondence to Qingbin Hao or Xiaoyan Xu.

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Hao, Q., Xu, X., Jiao, G. et al. Impact of hot isostatic pressing on the microstructure and current-carrying capacity of Bi-2212 wires. J Mater Sci: Mater Electron 35, 746 (2024). https://doi.org/10.1007/s10854-024-12480-0

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