New applications in ceramic superconductor technology require long superconducting bars that carry large currents. Electrical contacts to the bars can be made by sintering silver to the ceramic. Contact resistance arises from the silver and the interfacial zone. A large resistance coupled with high currents could result in power losses that would reduce the benefits of the superconductor. To determine the resistance between the silver and ceramic, 0.5 cm2 lap-joint connections were subjected to four-point electrical tests with pulsed currents greater than 100 A. Results show that the interfacial resistivity between the silver and ceramic at liquid nitrogen temperature was less than 10-7 Ωcm2.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)