实用化Bi系超导带材的制备工艺研究进展

摘要/Abstract

摘要： 超导材料具备优异的电学和磁学性能,具有很大的发展前景。目前应用最多的是NbTi和Nb₃Sn两种低温超导材料,但是其需要在4.2 K超低温下(液氦制冷)使用,成本高昂。Bi-2223的临界超导温度高达110 K,液氮制冷就可以使用,展现出良好的实用价值。Bi-2223是一种层状结构的化合物,常被制备成带材,使层面方向平行于带材表面,以发挥其最佳超导性能。但是将其实用化过程中还存在着Bi-2223相纯度不高、致密度不够、晶粒连接性不佳、抗拉伸强度和延伸率不足等问题。为了能够实用化,必须兼顾电学性能、机械性能、制冷技术等因素。本文综述了实用化Bi系超导带材的制备工艺与研究进展,分别对Bi-2223前驱粉制备工艺、Bi-2223带材的制备工艺及研究进展、Bi-2223超导带材实用化进展等进行介绍,为其制备工艺和实用化的进一步深入研究提供参考。

关键词: 超导带材, Bi-2223, Bi-2212, 高温超导, 超导材料, 高压烧结

Abstract: Superconducting materials have excellent electrical and magnetic properties and have great development prospects. NbTi and Nb₃Sn are currently the two most widely used low-temperature superconducting materials, but they require liquid helium refrigeration to be used at 4.2 K ultra-low temperature, which is costly. The critical superconducting temperature of Bi-2223 is as high as 110 K, and can use liquid nitrogen for cooling, showing good practical value. Bi-2223 is a compound with a layered structure, which is often prepared into tapes, so that the layer direction is parallel to the surface of the tape to exert its best superconductivity. However, on the road to its practical application, there are still problems such as insufficient purity of Bi-2223 phase, insufficient density, poor crystal grain connectivity, insufficient tensile strength and elongation. In order to be practical, factors such as electrical performance, mechanical performance, and refrigeration technology must be both considered. This paper summarizes the preparation technology and research progress of the practical Bi-based superconducting tape. The preparation process of Bi-2223 precursor powder, the preparation process and research progress of Bi-2223 tape, the progress of the practical application of Bi-2223 superconducting tape, etc. are introduced respectively, which provide references for further in-depth research on its preparation process and practical application.

Key words: superconducting tape, Bi-2223, Bi-2212, high-temperature superconductivity, superconducting material, high-pressure sintering

中图分类号:

TM26

郑贝贝, 邵玲, 陈英伟. 实用化Bi系超导带材的制备工艺研究进展[J]. 人工晶体学报, 2021, 50(8): 1583-1592.

ZHENG Beibei, SHAO Ling, CHEN Yingwei. Research Progress on Preparation Technology of Practical Bi-Based Superconducting Tape[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2021, 50(8): 1583-1592.

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