Fast creation of dense MgB2 phase in wires made by IMD process. (1st September 2016)

• Record Type: Journal Article
• Authors: Kováč, P; Hušek, I; Melišek, T; Kopera, L; Kulich, M
• Is Part Of: Superconductor science & technology. Volume 29:Number 10(2016:Oct.)
• Publication Date: 2016-09-01
• Subjects: reaction between Mg rod and B powder -- Mg infiltration -- Mg diffusion -- fast creation of MgB2 -- MgB2 wire by IMD process -- critical currents; Superconductivity -- Periodicals; Superconductors -- Periodicals; 537.623
• DOI: 10.1088/0953-2048/29/10/10LT01
• Languages: English
• ISSNs: 0953-2048

Abstract

Abstract: Single-core MgB2 wires have been made by internal magnesium diffusion (IMD) into boron process. Heat treatments were performed at variable periods (4–90 min) for two adjusted temperatures 635 °C and 650 °C, with an overshoot of ≈20 °C after 5 min. Critical currents of differently treated MgB2 /Ti/GlidCop wires have been measured and related with the MgB2 layers. The fast creation MgB2 compound has been observed after 8 min annealing at both temperatures and showing the critical current maxima. The less uniform MgB2 containing cracks was created for longer annealing periods (≥10 min), which resulted in lowered critical currents and worsened thermal stability. The fast creation of dense MgB2 allows it to utilize a continual and short heat treatment process for high current density wires made by IMD.