Composite-processed Nb3Sn with titanium addition to the matrix

Abstract

The effects of a titanium addition to the matrix on the superconducting properties and the metallurgical aspects of the composite‐processed Nb₃Sn have been studied. The titanium added to the matrix is found to diffuse readily into the Nb₃Sn layer. The small amount of the titanium addition to the matrix significantly increases the growth rate and the critical current density J_c in high magnetic fields of the Nb₃Sn layer. A J_c(Nb₃Sn layer) of over 1×10⁵ A/cm² has been obtained at 16 T for the Nb/Cu‐7 at. % Sn‐0.35 at. % Ti composite wire reacted at 750 °C for 100 h. The titanium addition to the matrix may be practically more promising than the titanium addition to the core.