烧结工艺对MgB_2/Nb/Cu超导带材力学性能及微观结构的影响  

INFLUENCE OF SINTER PROCESS ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF MgB_2/Nb/Cu TAPES

作　　者：熊晓梅[1] 闫果[1] 王庆阳[1] 杨芳[1] 刘国庆[1] 焦高峰[1] 贾佳林[1] 冯建情[1] 李成山[1] 

机构地区：[1]西北有色金属研究院,西安710016

出　　处：《低温物理学报》2013年第5期370-375,共6页Low Temperature Physical Letters

基　　金：国家"973"计划(批注号:2011CBA00104)资助的课题~~

摘　　要：采用原位法PIT技术制备了TiC掺杂的6芯MgB2/Nb/Cu超导带材,通过真空和高纯氩气两种烧结工艺进行了热处理.带材的室温拉伸性能显示,未热处理时的非比例延伸强度Rp0.2和抗拉强度Rm较大,断后伸长率A100小于5%;经过两种气氛热处理后的带材塑性有了较大改变,断后伸长率均大于5%,其中真空条件下热处理的带材应变大于高纯氩处理的带材.实验对两种带材的微观形貌及超导电性进行了对比观察和测试,结果显示在同样的烧结温度下,高纯氩烧结的带材超导层体积收缩较真空烧结的严重.在0T,35K下进行超导电性测试,结果发现真空烧结样品具有较高的临界电流密度.6-filamentary Mg2/Nb/Cu superconducting tapes doped with TiC were fabricated by in situ powder- in-tube method （PIT） and heat-treated in two different atmospheres of vacuum and high purity Ar. The tensile properties at room temperature show that the as rolled tapes before heat treatment possess a high disproportion ex- tension strength Rp0. 2 and tensile strength Rm, and the elongation percentage A100 is lower than 5 %. The plasticity has an evident improvement for the heat-treated tapes, and the elongation percentage A100 is higher than 5%. The plasticity of the tape heat treated in vacuum is better than that in high purity Ar. The microstructure and supercon- ductivity of the two tapes are also analyzed, the results show the volume shrink of the superconducting layer of the sample in high purity Ar is greater than that in vacuum. The tape heat-treated in vacuum showed a comparatively higher critical current density at 0T and 35K.

关 键 词：烧结工艺 MGB2 抗拉强度 超导电性 

分 类 号：O511[理学—低温物理]