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• W3136239551 abstract "An intrinsic powder-in-tube technique is used to fabricate Cu-sheathed MgB <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>2</sub> with and without a Ti barrier. The effect of heat treatment on reaction layers between the Cu sheath, Ti barrier, magnesium and boron is evaluated by scanning electron microscopy, energy dispersive X-ray spectroscopy and X-ray powder diffraction. Annealing the Cu (sheath)/Ti (barrier) prior to in situ heat treatment of the Mg + 2B reaction improves formation of a pure MgB <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>2</sub> core and eliminates subsequent reactions between B powder and the Ti barrier. Microstructural study of the interface between pure MgB <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>2</sub> and annealed Ti/Cu sheath does not show any evidence of reaction and diffusion between B and Ti which is beneficial for superconducting properties. Magnetization measurements of MgB <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>2</sub> superconducting wires have shown that the critical current density, J <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>c</sub> , of a Cu-sheathed wire combined with a Ti barrier can significantly enhance performance compared with a Cu-sheathed MgB <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>2</sub> wire without a Ti barrier. This enhancement is due to elimination of a MgCu <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>2</sub> interface layer between the copper sheath and magnesium powder for wires when a Ti barrier is involved. Pre-annealing of the Cu (sheath)/Ti (barrier) does not affect the J <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>c</sub> of MgB <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>2</sub> wires. This could make a positive effect on the J <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>c</sub> of the wires with finer filaments." @default.
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• W3136239551 date "2021-08-01" @default.
• W3136239551 modified "2023-10-13" @default.
• W3136239551 title "Microstructure and Superconducting Properties of Copper Sheathed MgB2 Wires With Ti Barrier Fabricated by in Situ Powder-in-Tube Method" @default.
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• W3136239551 doi "https://doi.org/10.1109/tasc.2021.3065634" @default.
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