Abstract
The original hot shock wave assisted consolidation method combining high temperature was applied with the two-stage explosive process without any further sintering to produce superconducting materials with high density and integrity. The consolidation of MgB2 billets was performed at temperatures above the Mg melting point and up to 1000oC in partially liquid condition of Mg-2B blend powders. The influence of the type of boron (B) isotope in the composition on critical temperature and superconductive properties was evaluated. An example of a hybrid Cu-MgB2–Cu superconducting tube is demonstrated and conclusions are discussed.
Highlights
The superconductive properties of MgB2 with C32 structure and critical transformation temperature of Tc=39K was discovered in 2001 [1]
Additional sintering processes after the shock wave compression are highly recommended for providing full transformation of consolidating blend phases into the MgB2 composites
Cylindrical tubes from steel and copper were used in order to consolidate high dense superconductive MgB2 billets
Summary
The superconductive properties of MgB2 with C32 structure and critical transformation temperature of Tc=39K was discovered in 2001 [1]. The technology of developing superconductive materials belongs to traditional powder metallurgy: preparing and densification of Mg and B powder blends in static conditions with their further sintering processes [6, 7]. The observation of clear correlation between the synthesis condition and crystal structure of the formed two phases MgB2-MgO composites as well as between their superconductive properties allowed the conclusion that redistribution of oxygen in the MgB2 matrix structure and formation of MgO phase may be considered as positive effects. Existing data of the application of shock wave consolidation technology for the fabrication of high dense MgB2 billets with higher Tc temperature practically gave the same results and the limit of Tc=40K is still considered maximal. Additional sintering processes after the shock wave compression are highly recommended for providing full transformation of consolidating blend phases into the MgB2 composites.
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