| 摘要 |
1110583 Conductors; super-conducting AVCO CORPORATION 25 June 1965 [17 July 1964] 27135/65 Headings H1A and A4D A composite conductor is made by coating an elongated super-conductor member with a first metal, then embedding it in another metal incapable of forming a compound of high thermal or electrical resistance with the first metal, and heating below the melting points of the various metals to interdiffuse the first and second metals. The first and second metals are chosen to be normally conducting at the transition temperature of the super-conductor. Typically, niobiumzirconium alloy wires electro-plated with copper are cleaned and disposed in grooves in the face of a copper or aluminium strip which is then rolled or pressed so as to grip the wires. The assembly is then annealed by heating in vacuum or inert gas for an hour at 560‹C. Alternatively, a composite wire is made by placing the coated wires with copper wires in a copper tube and pressing them together in a die before annealing. Other suitable materials for the wire are molybdenum-rhenium, bismuth-lead, niobium-titanium, niobium-tin and vanadium-gallium alloys and for the coating, which may alternatively be applied by vapour deposition, aluminium, cadmium, gold, silver, platinum and rhodium. |
