摘要
采用低碳钢作为外包套材料,通过原位法粉末装管工艺(in-situ PIT)制备出高密度Ti、Zr掺杂的MgB2/Fe/Cu线材。将线材短样在氩气保护条件下,于650～800℃烧结2～5h。MgB2线材的微结构分析显示,通过该工艺制备的MgB2/Fe/Cu线材比MgB2块材具有更好的晶粒连结性和更高的致密度。采用标准的四引线法,在4.2K,0～8T的磁场下测试线材的临界电流密度。测试结果显示,800℃烧结的Mg0.9Zr0.1B2/Fe/Cu线材获得了最高的临界电流密度。
Ti, Zr-doped dense MgB2/Fe/Cu wires were successfully fabricated adopting the in-situ powder-in-tube （PIT） method using low carbon steel sheath. The short samples wires were sintered at 650-850 ℃ for 2-5 h in argon. Critical current density （Jc） of the wires was measured at 4.2 K in the magnetic field up to 8 T by standard four probe method. High Jc values of 2.1×10^5A/cm2 were obtained in 3 T at 4.2 K for MgB2/Fe/Cu wires. Mg0.9Zr0.iB2/Fe/Cu wires sintered at 800 ℃ heat the highest Jc. The microstructure observation for wires showed that MgB2/Fe/Cu wires have better grain connectivity and higher density compared to MgB2 bulk samples. The Jc can be further improved to meet the requirement for applications by optimizing the process conditions.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2007年第6期977-980,共4页
Rare Metal Materials and Engineering
基金
国家重点基础研究发展计划(2006CB601004)
国家自然科学基金(50472099)资助
