Abstract
Several approaches to fabricating Nb3Al superconducting wires have been published in the last decade. These processes include: the Swiss roll, rapid quenching, mechanical alloying and powder metallurgy processing. This paper will address powder metallurgy (P/M) processing of Nb3Al and Nb-Sn. The recent measurements of critical current densities at high field for P/M processed Nb-Al gave Jc >10 A/cm2 at 19T and 4.2K. Good strain tolerance, low reaction temperatures, and low ac losses at high field all indicate that the P/M process for multifilamentary Nb-Al should lead to practical, high performance, superconducting wires for high fields. Significant improvements in powder metallurgy processing of Cu-Nb-Sn conductors have also been attained with low areal reductions, extrusion processing and with internal Sn cores. Increased Nb content increased Jc more than proportionally, and Ti additives yield very high Jc ‘s at high field. Thus, powder metallurgically processed Nb3Al and Nb3Sn are promising for high field applications.
Supported by the Department of Energy
Also the Department of Physics
Supported by the National Science Foundation
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Foner, S., Thieme, C.L.H., Pourrahimi, S., Schwartz, B.B. (1986). Practical Processing of A-15 Multifilamentary Superconducting Wire from Powders: Nb3Al and Nb3Sn. In: Reed, R.P., Clark, A.F. (eds) Advances in Cryogenic Engineering Materials . Advances in Cryogenic Engineering Materials , vol 32. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-9871-4_122
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