Sn based alloy containing Sn-Ti compound, method for manufacturing same, and precursor of Nb3Sn superconducting wire

摘要

A method for manufacturing a Sn based alloy containing a finely dispersed Sn-Ti compound by the steps comprising melting Sn by heating at 1300 to 1500° C in vacuum or under an inert gas atmosphere, adding 0.1 to 5% by weight of Ti followed by melting by heating, and casting the molten alloy into a copper mold directly or through a pouring cup. The Sn based alloy obtained by this method contains the Sn-Ti compound having a maximum particle diameter of 30 &mgr;m and mean particle diameter of 5 to 20 &mgr;m. A precursor of a Nb₃Sn wire is also obtained by an inner diffusion method using this Sn based alloy. The Nb₃Sn wire manufactured by using the Sn based alloy of the present invention exhibits excellent superconductive characteristics. The method of the present invention enables the ingot to be free from a shrinkage cavity appearing during the manufacturing process.