张胜楠,李成山,冯建情,徐晓燕,郝清滨,张平祥.增强芯丝密度对Bi-2212高温超导带材性能的影响[J].稀有金属材料与工程,2018,47(1):47~51.[ZHANG SHENGNAN,LI Chengshan,FENG Jianqing,XU Xiaoyan,HAO Qingbin,ZHANG Pingxiang.Density enhancement for the fabrication of Bi-2212 superconducting tapes[J].Rare Metal Materials and Engineering,2018,47(1):47~51.]
增强芯丝密度对Bi-2212高温超导带材性能的影响
投稿时间:2016-11-03  修订日期:2016-12-16
中文关键词:  高温超导材料  Bi-2212  装管密度  临界电流密度
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
中文摘要:
      采用共沉淀工艺制备Bi-2212前驱体粉末,并通过粉末装管法(PIT)制备了Bi-2212单芯带材。通过对装管粉末颗粒尺寸的控制,分别获得了具有不同芯丝密度的带材,并对其所引起的超导带材的微结构和超导载流性能的变化进行了系统的分析。SEM照片显示,前驱体粉末是由3~5微米的初级颗粒组成的,但是由于烧结过程中发生硬团聚,有大量的大尺寸团簇颗粒产生,颗粒尺寸由10微米到180微米不等。通过过筛将前驱体粉末按照颗粒尺寸分为四组,分别进行装管。结果表明,随着平均颗粒尺寸的减小,在冷加工和热处理过程中带材的芯丝密度均有明显增加。因此最终带材的晶间连接性较强,从而获得了带材载流性能较高。本研究可以作为装管工艺优化的一个重要理论依据,为Bi-2212超导线材性能的进一步提高奠定基础。
Density enhancement for the fabrication of Bi-2212 superconducting tapes
英文关键词:High temperature superconductor  Bi-2212  filling density  critical current density  
英文摘要:
      Bi2.1Sr1.96CaCu2.0O8+d (Bi-2212) precursor powders were synthesized with co-precipitation process, and Bi-2212 single filament tapes were fabricated with powder-in-tube (PIT) technique. Based on SEM observation, the primary grain size of Bi-2212 precursor powders was 3~5 mm. However, after sintering, Bi-2212 grains clustered together and the particle size distribution became quite wide, from 10 mm to over 180 mm. By dividing the particles into four groups with different average particle size, the influences of average particle size on the filament density, microstructures and current capacity of final Bi-2212 tapes were systematically investigated. It was observed that with the decrease of particle size, the filament density increased over the entire cold-working process and heat treatment process. Therefore, the intergrain connection was enhanced, which lead to the obvious increase of current capacity
作者单位E-mail
张胜楠 西北有色金属研究院 snzhang@c-nin.com 
李成山 西北有色金属研究院  
冯建情 西北有色金属研究院  
徐晓燕 西北有色金属研究院  
郝清滨 西北有色金属研究院  
张平祥 西北有色金属研究院  
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