| 摘要 |
PURPOSE:To improve critical current density by the application of compression stress to an oxide superconductor utilizing the shape memory property of a pipe as well as reduce invasion heat from the outside transmitting through the metal pipe by employing a shape-memory alloy as a metal pipe material with which an oxide superconductor is yielded. CONSTITUTION:A shape-storage alloy made pipe 1 of a predetermined diameter is expanded at a low temperature and is filled with oxide superconductor powder 2. Since the pipe 1 is to return to its diameter before its expansion as it is heated to the martensite transformation point or more of the shape memory alloy, compression stress is applied to the oxide superconductor powder 2 and hence is pressurized into high density, Sintering is performed in this situation to manufacture a current lead. Hereby,fragile peculiar to oxide superconductor ceramics is overcome and heat invasion from the outside is reduced, and hence a critical current density can be improved by making the powder high density. |
