Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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Fabrication of silver stabilizer layer by coating process using nano silver paste on coated conductor

나노실버페이스트를 사용하는 코팅공정에 의한 coated conductor의 은 안정화층 제조

  • 이종범 (한국산업기술대학교 에너지대학원) ;
  • 김병주 (한국산업기술대학교 에너지대학원) ;
  • 김혜진 (한국산업기술대학교 에너지대학원) ;
  • 유용수 (한국산업기술대학교 에너지대학원) ;
  • 이희균 (한국산업기술대학교 신소재공학과) ;
  • 홍계원 (한국산업기술대학교 신소재공학과)
  • Published : 2009.03.31
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Abstract

Mechanical and electrical properties of silver stabilizer layer of coated conductor, which as prepared with nano silver paste as starting materials, have been investigated, Nano silver paste was coated on a YBCO film by dip coating process at a diping speed of 20m/min. Coated film was dried in air and heat treated at $400{\sim}700^{\circ}C$ in an oxygen atmosphere. Adhesion strength between YBCO and silver layer was measured by a tape est(ASTM D 3359). Hardness and electrical conductivity of the samples were measured by pencil hardness test (ASTM D 3363) and volume resistance test by LORESTA-GP (MITSHUBISHD, respectively. The sample heat-treated at $500^{\circ}C$ showed poor adhesion 1B, but samples heat treated at higher than $600^{\circ}C$ showed enhanced adhesion of 5B. The silver layer heat-treated at $700^{\circ}C$ showed the high hardness value larger than 9 H, low volume resistance, surface resistance value as well as superior current carrying capacity compared to sputtered silver. SEM observations showed that a dense silver layer was formed with a thickness of about $2{\mu}m$. Dip coated silver layer prepared by using nano silver paste showed superior electrical and mechanical characteristics.

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References

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