Jointing of Coated Conductors by Using Nano-particle Metal Pastes

Tsuyoshi Nakanishi, Takato Machi, Teruo Izumi, Ryo Teranishi, Tomohiro Kato, Takeharu Kato, Tsukasa Hirayama

Research output: Contribution to journalConference articlepeer-review

4 Citations (Scopus)

Abstract

Development of a jointing technique of coated conductors is important for all applications, such as superconducting magnets, cables, etc. Low resistance jointing techniques by means of silver diffusion [1] and for superconducting joints[2] have been reported so far. Since these processes were carried out at higher temperatures than the O2 annealing temperature for appropriate carrier doping to the REBa2Cu3O7-d (REBCO) crystals and resulted in oxygen deficiency in the REBCO crystals, long time O2 annealing was required for compensation of this oxygen deficiency. Because the long time and high temperature post annealing is an inappropriate process as on-site technology, solder jointing technology has been widely accepted, in general, for practical applications. However, the resistance of the solder joint is 50 - 100 nΩ, and then the Joule heat generation in the joint region is a serious problem and must be solved. Consequently, we have studied a new jointing technique by using the pastes containing of silver or gold nano-particles. Because the Ic value of GdBCO was deteriorated with higher temperature heat treatment, we have tried to develop a jointing technology with the low temperature (below 200°C). We used the nano-particle metal pastes (∼5 nm) which contained dispersants around the chemically active surface of nano-particles and dissociates at low temperatures and achieved the low resistance joint (∼ 3nΩ, 10 x 160 mm2, 77 K) as well as no Ic degradation without O2 post annealing.

Original languageEnglish
Pages (from-to)105-108
Number of pages4
JournalPhysics Procedia
Volume81
DOIs
Publication statusPublished - 2016
Event28th International Symposium on Superconductivity, ISS 2015 - Tokyo, Japan
Duration: Nov 16 2015Nov 18 2015

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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