加工工艺对Bi-2223超导带材结构及性能影响  

Influences of processing methods on the microstructure and superconducting properties of Bi-2223 superconducting tapes

作　　者：王国迪 崔利军 刘政达[1,2] 岳天峰 闫果 郭强 刘向宏[2] 冯勇[2] Wang Guodi;Cui Lijun;Liu Zhengda;Yue Tianfeng;Yan Guo;Guo Qiang;Liu Xianghong;Feng Yong(State Engineering Laboratory of Superconducting Material Preparation,Xi'an 710018,China;Western Superconducting Technologies Co.Ltd.,Xi'an 710018,China)

机构地区：[1]超导材料制备国家工程实验室,西安710018 [2]西部超导材料科技股份有限公司,西安710018

出　　处：《低温与超导》2024年第12期10-15,共6页Cryogenics and Superconductivity

基　　金：国家自然科学基金(51902267)资助。

摘　　要：Bi-2223(Bi_(2)Sr_(2)Ca_(2)Cu_(3)O_(10))高温超导材料采用粉末装管(PIT)法结合拉拔工艺制备而成。本研究在常规拉拔工艺基础上,采用辊轧工艺替代部分拉拔工艺,系统研究了不同加工工艺对超导线/带材芯丝硬度、均匀性、晶粒织构度及超导性能的影响。结果表明,辊轧工艺可以有效提升Bi-2223超导芯丝的硬度,增幅达25%以上,同时线材芯丝均匀性得到显著改善。由于辊轧工艺线材较高的芯丝致密度,经单道次小变形量轧制后,芯丝间搭接现象较少,热处理后带材中Bi-2223相晶粒的织构度最高,使得辊轧工艺带材的工程电流密度Je达到4.6 kA/cm^(2),相比于常规拉拔工艺,带材Je提高约13%。Bi-2223(Bi_(2)Sr_(2)Ca_(2)Cu_(3)O_(10))high-temperature superconducting materials wre prepared by the powder-in-tube(PIT)method combined with the drawing process.Instead of the conventional drawing process,the roll-rolling process was used to investigate the effects of different processing methods on the hardness,uniformity,grain texture,and superconducting properties of superconducting wires/strips core wire.The results clearly demonstrate that the roll-rolling process is an effective method for improving the hardness of Bi-2223 superconducting core wire,with an increase of more than 25%.Additionally,the uniformity of the wire core is significantly enhanced.Due to the higher core wire densities of the rolled process wires,less overlap between the core wires after rolling with small single pass deformation,and the highest degree of weaving of the Bi-2223 phase grains in the tapes after heat treatment,the engineering current density Je of the rolled process tapes reaches 4.6 kA/cm^(2),which is an increase in Je of the strips by about 13%as compared to the conventional drawing process.

关 键 词：高温超导带材 辊轧工艺 硬度 工程电流密度 

分 类 号：TB34[一般工业技术—材料科学与工程]