レーザ照射による超電導体の接合II Connecting Superconductors by Laser Irradiation II
A study on connecting superconductors of Y system 123 phase through the laser irradiation treatment has been conducted. Superconductive powder of the identical phase pasted with a mixture of organic binder and solvent were filled as a medium between the two pieces of the superconductive bulk installed on a jig system, and which were set on a X-Y table to be irradiated by CO<SUB>2</SUB> laser accompanied by oxygen gas blow along its contact line under the conditions : laser output power 260-320 W at defocus distance of focal point 120 mm, assist gas pressure 98-294 kPa, beam scan speed 1-8 mm/min, and beam scan times 1-3 strokes.<BR>The results indicated that the electric resistance was almost constant before the laser irradiation but 57.9 K as Tc<SUB>(and)</SUB> was obtained for the certain samples when blown with a great deal of oxygen gas at low speed beam scans at the laser irradiation. SEM image and EPMA mapping after the laser irradiation showed that the superconductive bulk and the paste were connected successfully.
粉体および粉末冶金 44(2), 173-176, 1997-02-15
Japan Society of Powder and Powder Metallurgy