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Title: A Hydrostatic Processing Facility for Superconducting Wire

Publication Date:
Research Org.:
Alabama Cryogenic Engineering, Inc.
Sponsoring Org.:
USDOE - Office of Energy Research (ER)
OSTI Identifier:
Report Number(s):
DOE Contract Number:
Type / Phase:
Resource Type:
Technical Report
Country of Publication:
United States
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Niobium Tin; Superconducting Wire; Hydrostatic Processing

Citation Formats

John B. Hendricks, and William K. McDonald. A Hydrostatic Processing Facility for Superconducting Wire. United States: N. p., 2007. Web.
John B. Hendricks, & William K. McDonald. A Hydrostatic Processing Facility for Superconducting Wire. United States.
John B. Hendricks, and William K. McDonald. Mon . "A Hydrostatic Processing Facility for Superconducting Wire". United States. doi:.
title = {A Hydrostatic Processing Facility for Superconducting Wire},
author = {John B. Hendricks and William K. McDonald},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon May 07 00:00:00 EDT 2007},
month = {Mon May 07 00:00:00 EDT 2007}

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  • The conventional manufacturing process for Nb/sub 3/Sn multifilamentary superconducting wire is a combination of hot extrusion and wire drawing. An alternative process, cold hydrostatic extrusion, was developed in our laboratories. All experimental data pertaining to the hydrostatic extrusion process are presented, and a comparison is made between the two manufacturing methods. The results show that monofilamentary Nb/sub 3/Sn wire produced by hydrostatic extrusion not only has good superconducting properties, but also that larger reductions are achieved per pass, and fewer and shorter intermediate anneals are required in its manufacture.
  • Results indicate that the superconducting properties of Nb/sub 3/Sn wires could be improved by the use of hydrostatic extrusion. Billets with varying ratio of core to sleeve radius are being hydrostatically extruded and will be tested. The measured data will be compared with conventionally drawn wires.
  • The first objective was to assess the merits of cold hydrostatic extrusion as an alternative metal forming process and to compare it with conventional wire drawing. A series of Nb/sub 3/Sn monofilamentary wires was prepared by cold hydrostatic extrusion. Another series of conductors was prepared by wire drawing. These wires had identical materials, dimensions, bronze-to-niobium ratios and diffusion treatment as the extruded wires. A direct comparison showed that cold hydrostatic extrusion can serve as a good alternative to the wire drawing technique of manufacturing Nb/sub 3/Sn wires because cold hydrostatic extrusion reduces the number of processing steps, i.e., fewer passesmore » and fewer intermediate anneals. The second objective was to evaluate important superconducting properties of the hydrostatically extruded samples. The effect of strain on critical current density, J/sub c/ at 4.2K and 8T was examined.« less
  • The application of hydrostatic extrusion processing to composite wire fabrication offers several advantages over conventional reduction techniques. These include enhanced uniformity, increased reduction capability, and successful extrusion of normally brittle materials. Specifically, this work involved an experiment to screen the effects of seven extrusion process parameters on the uniformity and density of as-extruded BSCCO-core wire, and the required extrusion pressure. Results suggest the following factors to be potentially significant: (1) back pressure, extrusion ratio, and die angle on core uniformity, (2) packing method, extrusion ratio, silver powder additions, and temperature on density, and (3) extrusion ratio and temperature on extrusionmore » pressure.« less