Patent ID: 8518144

Claim:
A method for preparing high purity NiTi alloy comprising: melting at least one of titanium particles and titanium sponge with at least one of nickel particles and nickel pellets along with any desired minor elements under vacuum using Vacuum Induction Furnace Melt Vacuum Arc Remelt, Vacuum Arc Remelt Vacuum Arc Remelt or Induction Skull Melting Vacuum Arc Remelt to make NiTi alloy having inclusions; placing the NiTi alloy having inclusions in an eletroslag remelting furnace with a CaF 2 slag forming material which will chemically react with the inclusions when the alloy is melted; melting the NiTi alloy with the slag forming material to form molten NiTi alloy and slag; and separating the slag from the molten NiTi alloy.