Multifilamentary V3Ga wires and tapes with composite cores

✍ Scribed by R.G. Sharma; Y. Tanaka; K. Tachikawa

• Book ID: 103050482
• Publisher: Elsevier Science
• Year: 1985
• Tongue: English
• Weight: 809 KB
• Volume: 25
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/0011-2275(85)90005-0

✦ Synopsis

Results on the critical current behaviour of 19 core composite superconducting wires and tapes in magnetic fields up to 9 T are reported. The composite cores used in the present studies are vanadium tubes filled with Cu--Ga matrix. Two V3Ga layers are formed on either side of the tubular vanadium. For a given matrix volume to vanadium surface area ratio, the inner V3Ga layer has much faster growth rate and consequently finer grains than the corresponding outer layer. An increase of about 50% in overall critical current density compared to the 19 core wires using the same starting materials but prepared with conventional geometry has been obtained. The critical current density of V3Ga (Jc) as well as the overall critical current density (Jc) of the tape specimens with composite cores is significantly higher than the corresponding wires. Enhanced surface flux pinning seems to be responsible for the higher current density in the tapes. Addition of 6 at% gallium to vanadium and 0.5 at% Mg to Cu-Ga (19 at%) matrix leads to enhanced critical current densities in these specimens in conformity with our earlier studies.