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Development of MgB 2 Wires H. Fang and K. Salama Texas Center for Superconductivity and Advanced Materials University of Houston, Houston, TX 77204-5002.

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Presentation on theme: "Development of MgB 2 Wires H. Fang and K. Salama Texas Center for Superconductivity and Advanced Materials University of Houston, Houston, TX 77204-5002."— Presentation transcript:

1 Development of MgB 2 Wires H. Fang and K. Salama Texas Center for Superconductivity and Advanced Materials University of Houston, Houston, TX Texas Center for Superconductivity and Advanced Materials University of Houston NASA Commercial Space Center C SAMT

2 Fabrication Process (Powder-In-Tube) Mg and B raw powder High-energy ball milling Ultra-fine Mg and B mixture precursor Filling precursor into 1020 iron tube Groove-rolling the powder-filled tube Square wire 1mm by 1mm Flat-rolling the square wire Tape 2.5 mm wide and 0.2 mm thick Annealing at 800 ~950 o C Texas Center for Superconductivity and Advanced Materials University of Houston NASA Commercial Space Center C SAMT

3 Tape Morphology Cross-sectional Longitudinal Texas Center for Superconductivity and Advanced Materials University of Houston NASA Commercial Space Center C SAMT

4 Critical Current Density ~ Field T = 20 K T = 25 K T = 30 K Texas Center for Superconductivity and Advanced Materials University of Houston NASA Commercial Space Center C SAMT

5 10-Meter Long Square Wire Texas Center for Superconductivity and Advanced Materials University of Houston NASA Commercial Space Center C SAMT

6 Superconducting Coil The coil has an outer diameter of 12 mm and 12 turns. Texas Center for Superconductivity and Advanced Materials University of Houston NASA Commercial Space Center C SAMT

7 Critical Current ~ Field of Coil Texas Center for Superconductivity and Advanced Materials University of Houston NASA Commercial Space Center C SAMT

8 Conclusions Iron-clad MgB 2 superconducting tapes and wires were fabricated using the standard powder-in-tube method. Nano-sized Mg and B mixture powder was used as starting precursor. Measurements on short length tape shows a J c of 1.2 X 10 5 A/cm 2 at 20 K and 1.5 Tesla. 10 meter long square wire with outer cross-section area 1 mm by 1 mm was manufactured. A coil wound from this wire shows a I c of 160 A at 20 K and 1 Tesla. Texas Center for Superconductivity and Advanced Materials University of Houston NASA Commercial Space Center C SAMT


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