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|Type:||Artigo de periódico|
|Title:||Liquid Phase Sintering And The Use Of Nb-h Powder For Preparing Cu-nb//3sn Wires.|
|Author:||de Lima O.F.|
de Razende A.T.
|Abstract:||Cu-Nb//3Sn wires were prepared by the liquid phase sintering method. An Nb-H powder was used instead of the conventional and more expensive pure Nb powder. A pressed ingot of Cu-30-wt%-(Nb-H)-0. 3-wt%-Al was degassed and heat treated under vacuum in the region of the Cu liquid phase (T equals 1200 degree C). The hydrogen released during the process acted as a reducing atmosphere and also as an activation agent, promoting the wetting of niobium by liquid copper, leading to soft, high-density Cu-Nb sintered samples. Tin diffusion and reaction took place by means of external and internal processes. In the latter case cores of tin-rich alloy were used, and the occurrence of hard eta -phase precipitates was identified. The critical temperature is in the range of 16. 0 16. 8 K, and the critical current density is around 10**5A/cm**2 at H equals 7 T.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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