Study of composite fabrication process of new Nb3Sn superconducting wire and its performance improvement

研究了青铜、内锡和管内粉末混合结构的杂化镀铜工艺。在这个新工艺中，脆性Ti2Sn3粉末被用作α青铜基体的额外锡源。反应后形成较厚的Nb3Sn层，且Sn和Ti没有浓度梯度。定量分析表明，Nb3Sn厚层中Ti的浓度约为1.7 ~ 2.0。他们的Tc大约是17.5 K。混合青铜加工线材的Nb3Sn层Jc是普通青铜加工Nb3Sn线材的2倍。

The Hybrid Bronzed Process, which was having the hybrid configuration of the bronze, the internal-Sn and the powder-in-tube processes was studied. In this new process, the brittle Ti2Sn3 powders are used as an additional tin source for the alpha bronze matrix. After the reaction, significantly thick Nb3Sn layers were formed, and they showed no concentration gradient of Sn and Ti. The quantitative analysis revealed that the concentration of Ti in the thick Nb3Sn layer was approximately 1.7-2.0 at%. And their Tc was approximately 17.5 K. Nb3Sn layer Jc of the hybrid bronze processed wire was 2 times greater than that of commercial bronze processed Nb3Sn wires.