Since 2001, MgB₂ samples both in mono- and polycrystalline states were prepared [1]. However, from the application point of view, one of the most promising method of obtaining MgB₂ superconducting tapes and wires is the Powder-In-Tube (PIT) technique [2].

In our work superconducting Cu/Fe/MgB₂ and Steel/Cu/MgB₂ rods have been prepared using the modified PIT technique with explosive consolidation method. In this experiment the ex-situ process was used. Initial MgB₂ powder in Fe and Cu tubes was placed. In the next steps the inner tubes with initial materials were placed in additional tubes. After packing process two double arrangements of tubes with initial material were consolidated using the explosive process.

Metallographic observations, X-ray phase analysis and superconducting properties were investigated. The metallographic observations disclosed rigid and well consolidated MgB₂ rods. X-ray phase analysis appeared that this type of consolidation permits to obtain MgB₂ cores free from any voids and new phases. The transition temperature (T_C) for a cores samples determined by the ac susceptibility measurements indicates that T_C (~39 K) is almost the same as that earlier reported. Measurements of the magnetization-magnetic field were also carried out. From these analyses we can conclude that this method permits to obtain good quality MgB₂ rods.

References:

[1] Z. Wokulski and N. Orlińska, Materiały ceramiczne, LVIII, 1/(2006), p. 21.

[2] B. A. Glowacki, M. Majors, M. Vickers, J E. Evetts, Y. Shi, I. McDougall, Supercond. Sci. Technol., 14, 193 (2001).

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