Nb3Sn粒子分散複合体の超電導特性 : Nb3Sn粒子径の効果

概要

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Superconducting transition temperature (Tc) and critical current density (Jc) of the composite in which Nb3Sn particles with the average size of 0.07-62μm were dispersed in silver were measured. Tc increased as the increase of the volume fraction of Nb3Sn (VNb3Sn) and the diameter of Nb3Sn particle (dNb3sn). Jc increased as the increase of VNb3Sn⋅Jc showed a maximum at around dNb3Sn=0.10μm. The effect of dNb3Sn on Tc and Jc could be explained by the superconducting proximity effect. Tc and Jc of Nb3Sn-Ag composite increased by heat treatment above 962°C (m.p. of Ag) due to the improvement of contact between Nb3Sn particles and Ag matrix, but decreased by the heat treatment at 1100°C and 1200°C in the case of dNb3Sn=0.12μm, and at 1400°C in the case of dNb3Sn=1.0μm owing to the elution of SO from Nb3Sn into Ag matrix.
社団法人粉体粉末冶金協会の論文