Systematic changes of the Nb-Sn reaction with time, temperature and alloying in Restacked-Rod-Process (RRP) Nb3Sn strands

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Reaction heat treatments spanning 605 to 750 C and 24 to {approx}400 hours were applied to several sets of RRP strands. Magnetization and transport measurements were used to track the changes of superconducting properties and the amounts of Nb{sub 3}Sn formed. The experiments showed that temperature increases of 15 C produced equivalent properties in half the time within the temperature range 620-680 C. This result was the same whether Ta or Ti was used to alloy the Nb{sub 3}Sn. The bulk pinning force Fp for Ta-alloyed wires displayed a significant drop for temperatures outside the range above, due to tin ... continued below

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4 pages

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Ghosh, A.K.; Sperry, E.A.; D'Ambra, J.; /Brookhaven; Cooley, L.D. & /Fermilab September 1, 2008.

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Reaction heat treatments spanning 605 to 750 C and 24 to {approx}400 hours were applied to several sets of RRP strands. Magnetization and transport measurements were used to track the changes of superconducting properties and the amounts of Nb{sub 3}Sn formed. The experiments showed that temperature increases of 15 C produced equivalent properties in half the time within the temperature range 620-680 C. This result was the same whether Ta or Ti was used to alloy the Nb{sub 3}Sn. The bulk pinning force Fp for Ta-alloyed wires displayed a significant drop for temperatures outside the range above, due to tin gradients at low temperatures and grain growth at high temperatures. The F{sub p} drop at high reaction temperatures prevents wire technology from taking advantage of significantly higher Kramer-plot intercept H{sub K} for high-temperature reactions. On the other hand, Ti alloying provides a quick and potent means to increase H{sub K} at reaction temperatures for which F{sub p} remains high.

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4 pages

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  • Report No.: FERMILAB-PUB-08-304-TD
  • Grant Number: AC02-07CH11359
  • Office of Scientific & Technical Information Report Number: 938458
  • Archival Resource Key: ark:/67531/metadc901549

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  • September 1, 2008

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  • Sept. 27, 2016, 1:39 a.m.

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  • Dec. 8, 2016, 11:24 p.m.

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Ghosh, A.K.; Sperry, E.A.; D'Ambra, J.; /Brookhaven; Cooley, L.D. & /Fermilab. Systematic changes of the Nb-Sn reaction with time, temperature and alloying in Restacked-Rod-Process (RRP) Nb3Sn strands, article, September 1, 2008; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc901549/: accessed October 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.