IMD-MgB_(2)超导线材的研究进展

中心镁扩散技术(IMD)自2003年被Giunchi等人首创以来,国内外学者系统地揭示了Mg与B反应机制,MgB_(2)烧结成相过程及掺杂物的影响;IMD-MgB_(2)线材具有致密的MgB_(2)层,J_(e)远高于同等条件下传统PIT法制备的线材.目前IMD-MgB_(2)百米级线材已被成功制备,为IMD-MgB_(2)超导线材的生产应用奠定了基础.本文首先简要介绍了IMD-MgB_(2)超导线材的发展历程,其次讨论了对线材超导性能影响的相关因素,包括B粉和C掺杂、有效的MgB_(2)层密度、晶粒尺寸、粉末填充系数、线材直径、热处理条件及线材的交流损耗,最后简述了IMD-MgB_(2)超导线材目前存在的技术难题及未来的工作重心.

Research Progress of MgB2 Wires Prepared by IMD

Since the internal magnesium diffusion (IMD) technology was initiated in 2003 by Giunchi, the reaction mechanism between Mg and B, the phase formation process and mechanism of MgB2, and the influence of dopants have been systematically revealed by researchers; IMD-MgB2 wires have dense MgB2 layer, and Je is higher than those prepared by traditional PIT method under the same conditions. Now IMD-MgB2 100 m-class wire has been successfully prepared, which will lay the foundations on practical applications of MgB2 superconducting wires. In this article, firstly, the development history of IMD-MgB2 superconducting wires is briefly introduced. Furthermore? the influence mechanisms of relevant factors on superconducting properties are discussed, including B powder and C doping, effective MgB2 density, grain size, powder filling coefficient, wire diameter, heat treatment conditions and AC loss of wire. Finally? the existing technical problems and future work focusing on IMD-MgB2 superconducting wire are briefly described.