Understanding Routes for Dense MgB2 Wires by Pressureless Process

2013 Fiscal Year Final Research Report

• Project/Area Number: 24656368
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Single-year Grants
• Research Field: Physical properties of metals
• Research Institution: The University of Tokyo
• Principal Investigator: YAMAMOTO Akiyasu 東京大学, 工学(系)研究科(研究院), 助教 (20581995)
• Co-Investigator(Kenkyū-buntansha): SHIMOYAMA Junichi 東京大学, 大学院工学系研究科, 准教授 (20251366)
• Co-Investigator(Renkei-kenkyūsha): KISHIO Kohji 東京大学, 大学院工学系研究科, 教授 (50143392)
• Project Period (FY): 2012-04-01 – 2014-03-31
• Keywords: 超伝導材料

Outline of Final Research Achievements

MgB2 has the highest critical temperature Tc (~40 K) among conventional metallic superconductors and is expected to be applied at 5-30 K using a compact cryocooler, which enables cooling without liquid helium. In this study, pressureless densification of superconducting core in MgB2 wires was investigated. (1) Modified in-situ process using MgB4 as precursor was developed. The packing factor of MgB2 was improved 30% compared to the conventional in-situ process owing to the reduction of Mg amount in starting powder mixture. (2) Promotion of self-sintering of MgB2 under ambient pressure was succeeded. Record high connectivity was achieved owing to dense and well-connected grain-boundaries.

Free Research Field

工学