Abstract
In this study, YBa2Cu3Oy superconducting wires fabricated by cold extrusion. This process is expected to orient the grains and to produce a high JC value of the wires. The wire samples, which were extruded with the ratios of extrusion 75, 92, 140, 234, 500 and 2000, were sintered in flowing O2 gas. As a result, all samples were confirmed to exhibit the Meissner effect and to have TC of 85-93 K. The Jc values were increased with increasing the ratio of extrusion, and the maximum Jc value of 490 A/cm2 was measured in liquid nitrogen. However, many pores remained in the sintered body, and the oriented grains could not be recognized from SEM micrographs since the direction of grain growth was unrestricted for the pores.
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