Tailored Materials for High-Performance MgB2 Wire (pages 4942–4946)
Jung Ho Kim, Sangjun Oh, Hiroaki Kumakura, Akiyoshi Matsumoto, Yoon-Uk Heo, Kyeong-Se Song, Yong-Mook Kang, Minoru Maeda, Matt Rindfleisch, Mike Tomsic, Seyong Choi and Shi Xue Dou
Article first published online: 28 SEP 2011 | DOI: 10.1002/adma.201101243
Carbon-encapsulated crystalline boron nanopowder and coarse magnesium powder are used as inexpensive tailored starting materials for the fabrication of high-performance MgB2 superconducting wire. A low sintering temperature leads to a high critical current density, as a result of nanometer-sized boron powder, surface oxidation preclusion by carbon encapsulation, and grain alignment by elongated magnesium coarse powder.