Liquid-Phase Shock-Assisted Consolidation of Superconducting MgB2 Composites

Significant Statement

The liquid-phase HEC of Mg-B precursors above 900 ˚C provides formation of the MgB2 phase in the whole volume of billets with maximal Tc=38.5 K [1].

The type of applied B powder has influence on the final result of superconductive characteristics of MgB2 (Fig.1). In the case of amorphous 10B precursors: better results are fixed (38.5 K against 37.5) than in the case of crystalline 10B powder.

The purity of precursors is an important factor, and existing of oxygen in the form of oxidized phases precursor leads to reduced Tc and uniformity of the HEC billets.

The hot shock-wave consolidation procedure [1] increases dramatically the solid-state reaction rate similar to the photostimulation [2], but in difference to it allows one to produce bulk samples of different geometry important for practical applications due to the high penetration ability of shock waves. The Fig.2 presents new type containers for radioactive waste produced by this technology. The HEC technology allows one also to produce multilayer cylindrical tubes (pipes) with the Cu/MgB2/Cu structure which could find important applications for production of superconducting cables for simultaneous transport of hydrogen and electrical power in hybrid MgB2-based electric power transmission lines filled with liquid hydrogen [3].

Figure Legend

Fig.1. Temperature dependences of the zero-field-cooled (ZFC) and field-cooled (FC) magnetic moment for HEC MgB2 composites at 1000°C with intensity of loading 10 GPa in magnetic field 20 Oe.

•-Effects of inhibitory compounds in lignocellulosic hydrolysates on Mortierella isabellina growth and carbonutilization. Advances In Engineering

 

 

 

 

 

Fig.2. The pilot sample of developed multilayer container Al=(B4C+Pb)-steel.

  1. a) General view; b) Separated cover and body of container.

•-Effects of inhibitory compounds in lignocellulosic hydrolysates on Mortierella isabellina growth and carbonutilization . Advances In Engineering

 

 

 

 

 

[1]. Маmniashvili G., Daraselia D., Japaridze D., Peikrishvili A., Godibadze B. “Liquid-phase shock-assisted consolidation of superconducting MgB2 composites“, J. Supercond. Nov. Magn. 28 1925-1929 (2015).

[2]. Daraselia D., Japaridze D., Jibuti A., Shengelaya A., Müller K.A. “Rapid solid-state synthesis of oxides by means of irradiation with light”, J. Supercond. Nov. Magn. 26 2987-2991 (2013).

[3]. Kostyuk V.V., Antyukhov I.V., Blagov E.V., Vysotsky V.S., Katorgin B.I., Nosov A.A., Fetisov S.S., Firsov V.P, “Experimental hybrid power transmission line with liquid hydrogen and MgB2 based superconducting cable”, Technical Physics Letters. 38 279-282 (2012).

 

Journal Reference

Journal of Superconductivity and Novel Magnetism, , Volume 28, Issue 7, pp 1925-1929. 

Маmniashvili1, D. Daraselia2, D. Japaridze2, A. Peikrishvili3, B. Godibadze3 

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1Andronikashvili Institute of Physics Ivane Javakhishvili, Tbilisi State University, 6, Tamarashvili St., 0177, Tbilisi, Georgia

2Ivane Javakhishvili Tbilisi State University, 3, Chavchavadze Av., 0128, Tbilisi, Georgia

3G.Tsulukidze Mining Institute, 7, Mindeli St., 0186, Tbilisi, Georgia,

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Abstract

An original two-stage liquid phase hot explosive compaction (HEC) procedure of Mg-B precursors above 900o C provides the formation of superconductivity MgB phase in the whole volume of billets with maximal Tc= 38.5 K without any further sintering.

The liquid-phase HEC strongly solid-state reaction rate is similar to photostimulation, but in this case due to the high penetrating capability of shock-waves in a whole volume of cylindrical billets and consolidation of MgB2 precursors near to theoretical density allows one to produce bulk, long-body cylindrical samples important for a number practical applications.

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