热处理气氛对(Bi,Pb)2Sr2Ca2Cu3Oy超导带材晶粒尺寸及相组成的影响

材料热处理学报, 2009, 30(4): 39-43.

热处理气氛对(Bi,Pb)2Sr2Ca2Cu3Oy超导带材晶粒尺寸及相组成的影响

郝清滨 ^1, , 李成山 ^2, , 郑会玲 ^3, , 熊晓梅 ^4, , 刘国庆 ^5, , 胡锐 ^6,

1.西北有色金属研究院,陕西,西安,710016;西北工业大学凝固技术国家重点实验室,陕西,西安,710072

2.西北有色金属研究院,陕西,西安,710016

3.西北有色金属研究院,陕西,西安,710016

4.西北有色金属研究院,陕西,西安,710016

5.西北有色金属研究院,陕西,西安,710016

6.西北工业大学凝固技术国家重点实验室,陕西,西安,710072

基金项目: 国家自然科学基金(50872114) 陕西省13115科技创新工程重大科技专项项目(2007ZDKG-45)

关键词： Bi-2223带材 , 晶粒大小 , AEC相 , 热处理气氛

Effect of heat treatment atmosphere on grain size and phase composition of (Bi, Pb)2Sr2Ca2Cu3Oy superconducting tapes

采用粉末装管法(PIT)制备(Bi,Pb)2Sr2Ca2Cu3Oy(Bi-2223)超导带材,通过X射线衍射仪、扫描电镜研究热处理气氛对Bi-2223晶粒尺寸、结晶度及相组成的影响.研究结果表明:采用空气热处理有利于Bi-2223晶粒的长大;采用7.5%O2-Ar气氛热处理带材中存在较少的非超导相,且Bi-2223的结晶度较高;通过一种复合气氛热处理(热处理过程中使用两种气氛),带材Bi-2223晶粒尺寸较大且非超导相较少.工艺优化后最终带材的临界电流密度超过20000A/cm2(自场,77K).

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