超导线材阻隔层用铌片表面起皮的改进研究

Study on Improvements of Surface Peeling in Niobium Sheet for Barrier of Superconducting Wire

应用扫描电镜和能谱分析等方法对超导线材阻隔层用铌片表面起皮缺陷进行了研究,并对引起表面起皮的过程进行了分析。结果表明:引起超导线材阻隔层用铌片表面起皮的主要原因有W元素的偏析、铸锭熔炼工艺和板坯表面处理工艺等。提出相应的改进措施,提高了铌片的表面质量。

Surface upwarp defects in niobium sheet barrier in superconducting wire were investigated by using scan electron microscope（SEM） and energy spectrum analysis, and the process of surface peeling was analyzed. The results show that W element segregation, the melting process of the ingot and the surface treament process of slab are the main reasons of causing the surface peeling in niobium sheet barrier in superconducting wire. And the corresponding improvement measures were presented. The surface quality of the niobium sheet is improved.