Microstructure in High-Density MgB2 Wires Prepared by an Internal Mg Diffusion Method

被引：12

作者：

Shimada, Yusuke ^{[1
]}

Kubota, Yuuki ^{[1
]}

Hata, Satoshi ^{[2
]}

Ikeda, Ken-ichi ^{[2
]}

Nakashima, Hideharu ^{[2
]}

Matsumoto, Akiyoshi ^{[3
]}

Togano, Kazumasa ^{[3
]}

Hur, Jahmahn ^{[3
]}

Kumakura, Hiroaki ^{[3
]}

机构：

[1] Kyushu Univ, Dept Mat & Mol Sci, Kasuga, Fukuoka 8168580, Japan

[2] Kyushu Univ, Fac Engn Sci, Kasuga, Fukuoka 8168580, Japan

[3] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050047, Japan

来源：

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY | 2011年 / 21卷 / 03期

基金：

日本学术振兴会;

关键词：

Heat treatment; MgB2; wire; microstructure; reaction-induced diffusion process; SUPERCONDUCTING MGB2; PERFORMANCE; POWDER; TAPES;

D O I：

10.1109/TASC.2010.2091097

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Several reaction-induced diffusion processes to fabricate high-density MgB2 materials are developed, and the critical current density (J(c)) has been notably enhanced. In this study, microstructure in high-density MgB2 wires fabricated by an internal Mg diffusion (IMD) process has been investigated. The inner reacted region of the wire heat-treated at 640 degrees C for 1 h shows dense polycrystalline MgB2 of 20-200 nm in grain sizes. Fine MgO and Mg2Si particles of 10-30 nm in sizes are dispersed in this region. On the other hand, the outer region near the Ta sheath is composed of unreacted B and SiC powders, fine MgO particles and small voids. Sizes of voids in the IMD MgB2 wire are small compared with the PIT MgB2 wire. Oxidation of Mg in the IMD process forms fine dispersion of MgO which may be effective for flux pinning.

引用

页码：2668 / 2671

页数：4

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