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Fabrication of Yb123 Tapes.

DE2001768587

Publication Date	2000
Personal Author	Athur, S.; Balachandran, U.; Salama, K.
Page Count	6
Abstract	While Bi-2223 tapes have been the workhorses of the superconductor industry, their poor performance in applied magnetic fields restrict their use to below 30 K. Meltprocessing of Ag-clad Yb-123 PIT tapes offers a simple and scalable technique for fabricating long-length HTS conductors capable of being used at 77 K. Under reduced oxygen partial pressure, the peritectic temperature of Yb-123 is below the melting point of Ag, and this facilitates the adaptation of melt-texturing methods for fabricating these tapes. The effect of melt-processing temperature on current density was also explored; a temperature of 965 degrees C yielded optimal critical current values. The critical current density achieved at 4.2 K was 20,000 Alcm2, corresponding to a critical current of 52 A. Based on the above results, an optimal processing zone for melt-processing of Ag-clad Yb-123 tapes was determined. These results hold promise for melt-processing of Ag-clad Yb-123 tapes as an alternative to Bi-2223 PIT technology.
Keywords	High growth rates Melt-texturing Superconductors Temperatures Fabrication Tube powder YB-123 Current density Melt-processing temperature
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Argonne National Lab., IL. Energy Technology Div.; Texas Center for Superconductivity, Houston.; Department of Energy, Washington, DC. Office of Energy Efficiency and
Supplemental Notes	Prepared in cooperation with Texas Center for Superconductivity, Houston. Sponsored by Department of Energy, Washington, DC. Office of Energy Efficiency and Renewable Energy.
Document Type	Technical Report
NTIS Issue Number	200122
Contract Number	DE-W-31-109-ENG-38

Fabrication of Yb123 Tapes.

Fabrication of Yb123 Tapes.
DE2001768587

Publication Date	2000
Personal Author	Athur, S.; Balachandran, U.; Salama, K.
Page Count	6
Abstract	While Bi-2223 tapes have been the workhorses of the superconductor industry, their poor performance in applied magnetic fields restrict their use to below 30 K. Meltprocessing of Ag-clad Yb-123 PIT tapes offers a simple and scalable technique for fabricating long-length HTS conductors capable of being used at 77 K. Under reduced oxygen partial pressure, the peritectic temperature of Yb-123 is below the melting point of Ag, and this facilitates the adaptation of melt-texturing methods for fabricating these tapes. The effect of melt-processing temperature on current density was also explored; a temperature of 965 degrees C yielded optimal critical current values. The critical current density achieved at 4.2 K was 20,000 Alcm2, corresponding to a critical current of 52 A. Based on the above results, an optimal processing zone for melt-processing of Ag-clad Yb-123 tapes was determined. These results hold promise for melt-processing of Ag-clad Yb-123 tapes as an alternative to Bi-2223 PIT technology.
Keywords	High growth rates Melt-texturing Superconductors Temperatures Fabrication Tube powder YB-123 Current density Melt-processing temperature
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Argonne National Lab., IL. Energy Technology Div.; Texas Center for Superconductivity, Houston.; Department of Energy, Washington, DC. Office of Energy Efficiency and
Supplemental Notes	Prepared in cooperation with Texas Center for Superconductivity, Houston. Sponsored by Department of Energy, Washington, DC. Office of Energy Efficiency and Renewable Energy.
Document Type	Technical Report
NTIS Issue Number	200122
Contract Number	DE-W-31-109-ENG-38