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김상현,정순용 慶尙大學校 工科大學 自動化및컴퓨터應用技術硏究所 1998 自動化 및 컴퓨터應用技術 Vol.5 No.1
Bi-2223 superconductor is known as one of the candidates for practical superconducting wires. Ag-sheathed Bi-2223 superconducting wires were fabricated using the powder-in-tube(PIT) method. When the 19-filaments, wire was immersed in liquid nitrogen(77K), maximum critical current density J_c of 62 A/㎟ at 0 T was achieved. The critical current density has been shown to depend on the mechanical properties such as tensile stress and bending strain in Ag-sheathed Bi-2223 superconducting wires. The tensile strain for J_c degradation onset was in the range of 0.12∼0.3%. In the case of 19-filaments wire, the bending strain is estimated to be smaller than 0.3% for the reasonable J_c value. The observed degradation of the critical current density due to strain effect is inevitable and can be attributed to the formation of microcracks within the superconduction core.