Pressure-induced property improvement of magnesium diboride wire
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Publisher:IOP Publishing Ltd
Citation:F. Wan et. al. 2017 IOP Conf. Ser.: Mater. Sci. Eng. 279 012024. https://doi.org/10.1088/1757-899X/279/1/012024
The 4.2 K non-barrier transport Jc values of the powder-in-tube (PIT) in-situ MgB2 wires have been enhanced by cold high pressure densification (CHPD). With respect to the control wire, the 1.5 GPa pressure induced the Jc improvement of the wire at 4.2 K and 10 T by 25 %. The Jc enhancement induced by the CHPD may result from two aspects. First, the CHPD resulted in the reduction of the transverse MgB2 core area. Second, the grain connectivity of the PIT in-situ MgB2 wire was improved by the CHPD, which is reflected by the reduced porosity.
Cold high pressure densification can improve the 4.2 K non-barrier transport Jc of the PIT in-situ MgB2 wire in present paper. The best 4.2 K non-barrier transport Jc performance was obtained by W15 at all applied magnetic fields. The n-values of all cold-densified wires are above 30 when the applied magnetic field is below 9 T. The pressure dependence of the porosity of the PIT in-situ MgB2 wire was discussed. The reduced porosity of the MgB2 wire processed by the CHPD reflects that the Jc enhancement induced by the CHPD might result from the improved grain connectivity of the PIT insitu MgB2 wires.