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Article Dans Une Revue Journal of Superconductivity and Novel Magnetism Année : 2012

Investigation of Nb-B Diffusion and the Superconducting Properties of MgB2/Nb/Cu Tapes

Résumé

The Nb-B diffusion behaviors and their effects on the superconducting properties of MgB2/Nb/Cu tapes were investigated. Two relevant samples of the Nb-B diffusion couples and monocore MgB2/Nb/Cu tapes were prepared with the same standard in situ PIT method, respectively. And both the samples were sintered at 650, 750, 850, and 950°C for 2 hours, respectively. It has been found that Nb-B interface is invisible in the diffusion couples sintered at low temperatures as 650°C, correspondingly the superconducting properties of MgB2 tapes are superior to those of the ones sintered at the other three temperatures. With the heating temperature increasing, Nb-B interface, mainly NbB2 with a little NbB, appears and becomes thicker gradually in the Nb-B diffusion couples. The corresponding superconducting properties of MgB2 tapes follow the similar patterns: within the range from 650°C to 950°C, the higher the sintering temperature, the poorer the superconducting performances, because the Nb-B diffusion in MgB2 tapes could cause the property degradations of MgB2/Nb tape. As extended to the actual fabrications of Nb sheathed MgB2 tapes or wires, suitable sintering temperature range should be from 650°C to 750°C for the desired performances.

Dates et versions

hal-00985480 , version 1 (29-04-2014)

Identifiants

Citer

Gaofeng Jiao, Guoqing Liu, Ming Qi, André Sulpice, Yuyan Sun, et al.. Investigation of Nb-B Diffusion and the Superconducting Properties of MgB2/Nb/Cu Tapes. Journal of Superconductivity and Novel Magnetism, 2012, 25 (4), pp.943-950. ⟨10.1007/s10948-011-1395-y⟩. ⟨hal-00985480⟩

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