高温超导Ag基带的织构研究  

Texture control of silver substrates for high temperature superconductor

作　　者：刘丹敏[1] 周美玲[1] 郭汉生[1] 胡延槽[1] 左铁镛[1] 

机构地区：[1]北京工业大学材料科学与工程学院,北京100022

出　　处：《中国有色金属学报》2000年第1期5-11,共7页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金! 59771 0 1 0

摘　　要：通过温轧及退火制备了强立方织构的Ag基带 ,通过冷轧及退火制备了强 {1 1 0 }双轴织构的Ag基带 ,为高温涂层超导提供了很好的基带材料。探讨了Ag基带中立方织构和 {1 1 0 }双轴织构的形成机理。得到立方织构的关键是轧制时尽量使形变过程以滑移为主 ,从而有较高的C取向 ,通过动态再结晶首先出现立方织构晶核。得到{1 1 0 }双轴织构的关键是利用Ag冷轧时黄铜取向易以孪晶方式形变的特点 ,保持B取向的稳定 ;再结晶退火时 ,利用其首先形成退火孪晶的特性 ,随后的扩散长大即以此为核心形成较强的 {1 1 0 }双轴织构。在所制备的强 {1 1 0 }〈1 1 2〉双轴织构的银带上 ,用PLD方法直接沉积的YBCO超导薄膜 ,Jc 值达到 ( 2～ 6)× 1 0 5A/cm2 ( 77K ,0T)。The silver tape with ｛100｝〈100〉 texture was obtained by hot rolling and subsequent annealing. A ｛110｝ biaxially textured silver tape was obtained by cold rolling and subsequent annealing. The formation regulations of the cube texture and the ｛110｝ biaxially texture in the silver tape were investigated. Cube texture can be obtained by hot rolling. In the process of rolling, twin must be avoided in order to increase the strength of the C orientation. The crystals in C orientation turn into cube orientation by dynamic recrystallization. A strong single orientation ｛110｝ texture can be formed by cold rolling and recrystallizing annealing. In the process of cold rolling, dynamic recrystallization must be avoided in order to maintain the stability of the B orientation. When cold rolled Ag tapes were recrystallizing annealed in high temperature, a strong single orientation ｛110｝ texture can be formed. YBCO was deposited by pulsed laser deposition (PLD) on the silver foil with texture ｛110｝〈211〉. The transport currents measured for the films were (2～6)×10 5?A/cm 2 at 77 K, 0T.

关 键 词：高温超导薄膜 立方织构 双轴织构 孪晶 超导带 

分 类 号：TM261.103[一般工业技术—材料科学与工程]