Nb3Al superconducting tape prepared by CO2 laser beam irradiation

✍ Scribed by Y. Yamada; S. Murase; M. Sasaki; E. Nakamura; H. Kumakura; K. Togano; K. Tachikawa

• Book ID: 103051207
• Publisher: Elsevier Science
• Year: 1986
• Tongue: English
• Weight: 706 KB
• Volume: 26
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/0011-2275(86)90076-7

✦ Synopsis

A15 Nb3AI tape superconductors have been prepared by high power and continuous wave CO2 laser irradiation onto moving Nb-AI composite tapes made by the powder method. The irradiated area was melted and then immediately resolidified, which resulted in a dendritic microstructure consisting of Nb dendrites embedded in a Nb3AI matrix. Irradiated only specimens showed critical temperatures, Tc, >16.0 K and subsequent heat treatment at 750°C enhanced Tc to 18.6 K. For laser irradiated and then heat treated specimens, critical currents, Ic, were little decreased, even at >20 T, compared with specimens which were only heat treated. A maximum critical current density, Jc, for the reacted area of 4.8 x 104 A cm -2 was obtained at 23 T and 4.2 K.