摘要
开发了制备Ｂｉ系高温超导带材的热压新工艺并研究了其变形机理。研究表明：合理的工艺参数为７５０℃／２００ＭＰａ／３０ｍｉｎ。Ｂｉ－２２２３带材经热压处理后能有效地提高粉芯的密度，可在较小的压力下获得较大的变形率，并且晶粒破碎程度较轻。带材经热压处理后的临界电流密度ＪＣ在７７Ｋ和零场下最高达２２５ＭＡ／ｍ２。
Experiments of hot pressing of the tapes are carried out. Parameters of pressure, temperature and time were determined. High J C is achieved at the condition of 750 ℃/200 MPa/30 min. It is found that hot pressing caused the core to be more dense, better texture and could avert the formation of cracks effectively. At 77 K and zero field, the maximum J C value is up to 225 MA/m 2.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
1998年第1期48-52,共5页
Journal of Mechanical Engineering
基金
国家教委博士点基金
关键词
超导带材
热压
变形机理
临界电流密度
BI系
Superconducting tapes Hot pressing Deformation mechanism Critical current density
