High transport currents in mechanically reinforced MgB2 wires

Abstract

We prepared and characterized monofilamentary MgB2 wires with a mechanically reinforced composite sheath of Ta(Nb)/Cu/steel, which leads to dense filaments and correspondingly high transport currents up to Jc = 10^5 A/cm^2 at 4.2 K, self field. The reproducibility of the measured transport currents was excellent and not depending on the wire diameter. Using different precursors, commercial reacted powder or an unreacted Mg/B powder mixture, a strong influence on the pinning behaviour and the irreversibility field was observed. The critical transport current density showed a nearly linear temperature dependency for all wires being still 52 kA/cm^2 at 20 K and 23 kA/cm^2 at 30 K. Detailed data for Jc(B,T) and Tc(B) were measured.

21 pages, 13 figures, revised version, to be published in Supercond. Sci. Technol

References in corpus (8)

• Strongly linked current flow in polycrystalline forms of the new superconductor MgB2
• Boron Isotope Effect in Superconducting MgB${}_2$
• Superconductivity in Dense $Mg{B}_2$ Wires
• Thin Film Magnesium Boride Superconductor with Very High Critical Current Density and Enhanced Irreversibility Field
• Thermodynamic and Transport Properties of Superconducting $M{g}^{10}{B}_2$
• MgB2 superconducting thin films with a transition temperature of 39 Kelvin
• Large transport critical currents in unsintered MgB2 superconducting tapes
• Electronic anisotropy, magnetic field-temperature phase diagram and their dependence on resistivity in c-axis oriented MgB2 thin films

Cited by in corpus (14)

• High performance new MgB2 superconducting hollow wires
• Superconductivity, critical current density, and flux pinning in MgB_{2-x}(SiC)_{x/2} superconductor after SiC nanoparticle doping
• Transport critical current density in Fe-sheathed nano-SiC doped MgB2 wires
• Microstructure and high critical current of powder in tube MgB2
• Drawing induced texture and the evolution of superconductive properties with heat treatment time in powder-in-tube in-situ processed MgB2 strands
• Fabrication and transport critical currents of multifilamentary MgB2/Fe wires and tapes
• Influence of mechanical reinforcement of MgB2 wires on the superconducting properties
• Study of Ag and Cu / MgB2 powder-in-tube composite wires fabricated by in-situ reaction at low temperature
• Transport critical current of Solenoidal MgB2/Cu Coils Fabricated Using a Wind-Reaction In-situ Technique
• Transport critical current densities and n factors in mono- and multifilamentary MgB2/Fe tapes and wires using fine powders
• Influence of the Preparation Process on Microstructure, Critical Current Density and Tc of MgB2 Powder-In-Tube Wires
• Mechanical properties of reinforced MgB2 wires
• High temperature heat treatment of B precursor and P.I.T. process optimization to increase Jc performances of MgB2-based conductor
• Mechanically reinforced MgB2 wires and tapes with high transport currents