Fabrication Process and Pressure Dependence of Critical Current Density in Ba1-xKxFe2As2 Superconducting HIP Wires
Fabrication Process and Pressure Dependence of Critical Current Density in Ba1-xKxFe2As2 Superconducting HIP Wires
复制标题
DOI：
10.1088/1742-6596/1054/1/012044
复制
发表时间：
2018-07
期刊：
影响因子：
--
通讯作者：
S. Pyon;T. Suwa;T. Tamegai;K. Takano;H. Kajitani;N. Koizumi;S. Awaji
中科院分区：
文献类型：
--
作者：
S. Pyon;T. Suwa;T. Tamegai;K. Takano;H. Kajitani;N. Koizumi;S. Awaji
本文介绍了采用粉末管法（PIT）和热等静压法（HIP）制备（Ba，K）Fe_2As_2超导线材的工艺。研究了几种具有不同烧结压力和时间条件的制造工艺。磁化强度、I-V特性、填充因子和维氏硬度的测量表明，制备工艺和烧结条件的改善对提高热等静压圆丝的临界温度Tc是有效的，从而提高了临界电流密度Jc。在不同工艺中制造的导线显示出显著不同的Tc和Jc。芯部密度可以通过在较高压力下烧结来提高，这是HIP线材中Jc提高的主要关键因素，类似于压制带。改变烧结时间对Jc也有轻微影响。
We demonstrate the fabrication of (Ba,K)Fe2As2 superconducting wires through a powder-in-tube (PIT) method and hot isostatic press (HIP) technique. Several fabrication processes with different sintering conditions of pressure and time were examined. The measurements of magnetization, I-V characteristics, filling factor, and Vickers hardness clarified that the improvement of fabrication process and sintering condition is effective for the enhancement of critical temperature Tc, which leads to the enhancement of critical current density Jc in HIP round wire. Wires which are fabricated in different processes show significantly different Tc and Jc. The core density, which can be enhanced by sintering at higher pressures, is the main key factor for enhancement of Jc in HIP wires, similar to pressed tapes. Changing the sintering time also slightly affect Jc.