Abstract
The purpose of this program was to demonstrate the feasibility of modifying an existing mid-size conventional extrusion press to permit, with a simple tooling change, hydrostatic extrusion of superconducting materials. Hydrostatic extrusion is considered by many the ideal method for low-temperature processing of superconductors in order to (a) maximize current densities and (b) successfully coextrude widely dissimilar materials that are typically within multifilament superconductor billets. Successful conversion of a midsize press could then ultimately lead to a similar modification of a much larger existing production extrusion press. This would provide the U.S. with a production capability at a much lower cost than would otherwise be possible. Battelle Columbus Division (BCD), as a sub-contractor to Supercon Inc., undertook the task of converting a 11 MN press located at Battelle’s Pacific Northwest Division (BPND). The converted press was designed to accommodate billets up to 94 mm in diameter x 559 mm long. Also, the converted tooling was designed to operate at extrusion pressures up to 1517 MPa. Feasibility of the converted press was demonstrated by successfully extruding Cu/NbTi, AI/NbTi, and Cu/Nb/Sn billets under conditions comparable to those used for hydrostatic extrusion of the same materials in a 39.1 MN production hydrostatic extrusion press. In addition, enhanced critical current densities in Cu/NbTi composites are shown for hydrostatically extruded materials.
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© 1990 Plenum Press, New York
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Kreilick, T.S., Fiorentino, R.J., Smith, E.G., Sunderland, W.W. (1990). Conversion of a 11 MN Extrusion Press for Hydrostatic Extrusion of Superconducting Materials. In: Reed, R.P., Fickett, F.R. (eds) Advances in Cryogenic Engineering Materials . An International Cryogenic Materials Conference Publication, vol 36. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-9880-6_7
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DOI: https://doi.org/10.1007/978-1-4613-9880-6_7
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