沟槽轧制提高Bi-2212线材的临界电流密度
Large critical current density improvement in Bi-2212 wires through groove-rolling process
摘要：
近年来，Bi-2212圆丝超导体在高磁场中的应用越来越受到人们的关注，但要使其在高磁场中成功应用，还需要提高临界电流。最近的研究表明，电流流动的主要障碍，特别是在长导线中，是这些粉末管处理的导体内的残余孔隙度，当Bi-2212熔化时，其在气泡聚集中发展。通过这项工作，我们试图克服这个问题的作用，对丝致密化，通过改变变形过程。在这里，我们显示的影响，槽轧制与拉伸过程中的临界电流密度JC和微观结构。特别地，槽乳多相线显示出相对于用相同Bi-2212粉末和结构制备的拉制线增加约3倍的JC。我们认为，这种方法在变形过程中能够产生所需的改进，因为超导性能得到了增强，并且因为它使制造过程更快，更便宜。
英文摘要：
Recently the interest about Bi-2212 round wire superconductor for high magnetic field use has been enhancing despite the fact that an increase of the critical current is still needed to boost its successful use in such applications. Recent studies have demonstrated that the main obstacle to current flow, especially in long wires, is the residual porosity inside these Powder-In-Tube processed conductors which develops in bubbles-agglomeration when the Bi-2212 melts. Through this work we tried to overcome this issue acting on the wire densification by changing the deformation process. Here we show the effects of groove-rolling versus drawing process on the critical current density JC and on the microstructure. In particular, groove-rolled multifilamentary wires show a JC increased by a factor of about 3 with respect to drawn wires prepared with the same Bi-2212 powder and architecture. We think that this approach in the deformation process is able to produce the required improvements both because the superconducting properties are enhanced and because it makes the fabrication process faster and cheaper.
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