High Temperature Growth Process of YBCO Superconducting Solder by Fluorine-free Chemical Solution Method

doi:10.11901/1005.3093.2024.381

Chinese Journal of Materials Research

2025, Vol. 39

Issue (6): 474-480 DOI: 10.11901/1005.3093.2024.381

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High Temperature Growth Process of YBCO Superconducting Solder by Fluorine-free Chemical Solution Method

HAN Leilei¹, WANG Wentao¹^,²(

), WU Yun¹, CHEN Jiajun¹, ZHAO Yong¹^,³

^1.Key Laboratory of Magnetic Levitation and Maglev Trains (Ministry of Education of China), School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China
^2.School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China
^3.College of Physics and Energy, Fujian Normal University, Fuzhou 350117, China

Cite this article:

HAN Leilei, WANG Wentao, WU Yun, CHEN Jiajun, ZHAO Yong. High Temperature Growth Process of YBCO Superconducting Solder by Fluorine-free Chemical Solution Method. Chinese Journal of Materials Research, 2025, 39(6): 474-480.

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Abstract

YBCO superconducting solders were prepared on YGdBCO superconducting layers of tapes by fluorine-free chemical solution method. The effect of high temperature heat treatment on the structure of solders and superconducting properties of tape was investigated. The results show that the YBCO polycrystalline film with strong (103) diffraction peak and uniform grain distribution was obtained by sintering the amorphous precursor film at 795 ^oC for 1 h. Then the polycrystalline film was transformed into YBCO single crystal film (solder) with (00l) orientation after sintering it at 820 ^oC for 30 min. After annealing in oxygen, the critical current I_c of the tape deposited with YBCO single crystal film is close to that of the original tape, indicating no obvious influence of the growth of superconducting solder on the superconductivity of the tape.

Key words: inorganic non-metallic materials high temperature growth process epitaxial growth YBCO film microstructure critical current

Received: 05 September 2024

ZTFLH:

TB34

Fund: Natural Science Foundation of Sichuan Province(2025ZNSFSC0360);Fundamental Research Funds for the Central Universities(2682022ZTPY086)

Corresponding Authors: WANG Wentao, Tel: (028)87600787, E-mail: wtwang@swjtu.edu.cn

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https://www.cjmr.org/EN/10.11901/1005.3093.2024.381 OR https://www.cjmr.org/EN/Y2025/V39/I6/474

Table 1 Specificationss of YGdBCO tape

Fig.1 Flow chart of YBCO superconducting solder preparation on the surface of superconducting layer of tape. Exposing partial YGdBCO layer by etching silver (a), wet film coating and pyrolysis (b), polycrystalline film growth in O₂ (c) and single crystal film formation in lower p(O₂) (d)

Fig.2 XRD patterns of YBCO polycrystalline films prepared on YGdBCO superconducting layers of the tapes at different temperatures (a), Relative intensity and full width at half maximum of (005) diffraction peak, and I(006)/I(005) (b)

Fig.3 SEM morphology of the original superconducting layer and YBCO polycrystalline films prepared at different temperatures

Fig.4 V-I curves of the original tape and the tape deposited with YBCO polycrystalline film (795 ^oC)

Fig.5 XRD patterns of YBCO single crystal films transformed from polycrystalline films at diff-erent temperatures (a), the relative intensity and full width at half maximum of (005) diffraction peak, and the relative intensity of (103) diff-raction peak (b)

Fig.6 SEM morphology of YBCO single crystal films transformed from polycrystalline films at different temperatures

Fig.7 XRD patterns of single crystal films transformed from polycrystalline films at 820 ^oC with different time (a), the relative intensity and full width at half maximum of (005) diffraction peak, and the relative intensity of (103) diffraction peak (b)

Fig.8 SEM surface morphology of single crystal films transformed from polycrystalline films at 820 ^oC with different growth time

Fig.9 V-I curves of the original tape and the tape with single crystal film prepared by sintering YBCO polycrystalline film at 820 ^oC for 30 min

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