Study on the transport current of FeSe0.5Te0.5 coated conductor with different stabilizing layers and solders

Abstract

The analysis of the influence of different stabilizing layers and solders on the transport current is very necessary for the engineering application of FeSe0.5Te0.5 coated conductors. The soldering temperature and thermal stress caused by cooling from room temperature to liquid helium can affect the critical current values of the superconducting tapes. For this, FeSe0.5Te0.5 coated conductors with four types of stabilizing layers and three types of solders were prepared. The stabilizing layer includes the copper layer with a thickness of 0.02 mm, 0.05 mm, 0.1 mm, and the silver layer with a thickness of 0.1 mm. The solders are respectively Bi50Pb25Sn12.5Cd12.5, Bi51.2Pb30.6Cd18.2, and Sn63Pb37. The experimental results show that the critical current of the tape encapsulated by the 0.02 mm thick copper layer and Bi50Pb25Sn12.5Cd12.5 is about 400 A at self-field and about 25 A at 10 T, which is superior to other samples. The details of the fabrication process and performance test results were presented in this paper.