Speaker
Description
In order to reduce the long-term annealing process and prevent excessive grain growth, we attempted to fabricate MgB2 superconducting wires by the rapid heating and quenching (RHQ) method.We have successfully synthesized kilometer-length 6+1 filamentary MgB2 wires reinforced and toughened by Nb/Cu composite with in-situ powder-in-tube method, and for the first time applied the rapidly heating and quenching (RHQ) to the treatment of MgB2 wires, directly realizing the superconductivity of quenched MgB2 wires as well as the improvement of workability, thus avoiding the necessary annealing program in the conventional process. The results show that the phase composition of samples is mostly MgB2 after treatment with heating current at 350A, except for a small amount of impurities. Most importantly, at 5T and 20K, the critical current density is still as high as 1.34×103A cm-2, which fully meets the requirements of practical applications.
