Microstructure of the MgB2 Wires Resulting by the Infiltration Process

作者：Saglietti Luca^*; Orecchia Claudio; Albisetti Alessandro Figini; Perini Elena; Giunchi Giovanni

来源：IEEE Transactions on Applied Superconductivity, 2011, 21(3): 2655-2658.

DOI：10.1109/TASC.2010.2092400

• Impurity phases
• infiltration process
• MgB2 wires
• microstructure
• packing density

MgB2 manufacts sintering requires a special attention in order to promote a good grain connectivity. In case of wires production, where application of pressure during sintering is practically unrealistic, the "in-situ" methods give a higher connectivity with respect to the "ex-situ" methods. In order to further improve the in-situ processing technology for the wires, we perform the Mg-RLI process, in which liquid Mg infiltration proceeds from the inner core of the wires to the surrounding B powders. The detailed microstructure analysis on the resulting MgB2 layer of these wires shows the influence of different B powders and different operative conditions of the process, giving explanations about the relationship between powder packing density and impurity phase abundance. In particular we discuss the use, as starting precursor materials, of low-price boron powders.

• 出版日期2011-6