Abstract
In order to develop joining methods maintaining mechanical strength and superconducting property, YBCO bulk superconductors were joined using YbBCO, which had lower peritectic temperature than YBCO, added Ag_2O as interlayer. As results of joining tests under such conditions that Ag_2O content added to YbBCO was 0〜44mass% and that joining temperature was 940℃〜1020℃, the joint strength increased in accordance with the joining temperature increase. Critical current density showed maximum value in case using the YbBCO interlayer added 10〜30mass%. Because of the boids made at the joint, strength of joint was inferior to that of matrix, however, it was suggested that joint properties could be improved by selecting the joining time and pressure properly.
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