Properties of Nb3Sn superconductor wires with composite cores
Abstract
In order to increase the pinning forces, Nb3Sn wires with filaments containing normal conducting inclusions were produced. The classical alloyed cores produced by melting were replaced by powder metallurgical ones consisting of mixtures from Nb and X powders (X = Ta, Ti, Ni, NbTi) pressed, extruded, and processed to rods. The further processing for 19 core wires was made by the bronze route. The wires were reacted for 64 to 120 hr at 625 to 750 C. Depending on the reaction temperature, a smaller or larger amount of the addition element dissolves in the superconducting A15 phase. By optimizing the reaction conditions, an envelope above classical binary and ternary Jc vs B curves is achieved, with simultaneously excellent carrying capacity at low and high fields. In the region 11 to 12 T (crossover for classical processed wires) the increase of wires with artificial pinning centers with respect to classical ones is 70%.
- Publication:
-
Unknown
- Pub Date:
- May 1987
- Bibcode:
- 1987pnss.rept.....G
- Keywords:
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- Composite Structures;
- Cores;
- Electric Wire;
- Niobium Stannides;
- Superconductors;
- Powder Metallurgy;
- Production Engineering;
- Superconductivity;
- Temperature Effects;
- Solid-State Physics