# 열처리조건이 초전도벌크의 임계특성에 미치는 영향

• 임성훈 (전북대학교 전기공학과) ;
• 한태희 (전북대학교 전기공학과) ;
• 박경국 (전북대학교 전기공학과) ;
• 조동언 (전북대학교 전기공학과) ;
• 이중근 (전북대학교 전기공학과) ;
• 한병성 (전북대학교 전기공학과)
• Published : 1997.11.01

#### Abstract

The Effects of different melting temperature and holding time in the melting temperature on J$\sub$c/ of YBa$_2$Cu$_3$O$\sub$x/ based superconducting bulk using MPMG process were investigated. the value of critical current density was the largest at l120$^{\circ}C$, the melting temperature which is appointed to the mid point of (Y$_2$BaCuO$\sub$5/ + Liquid)region. With the melting temperature in which the value of J$\sub$c/ is the largest, J$\sub$c/ was again measured to see whether the holding time at this proper melting temperature has the effect on the critical characteristics. From the result above it was concluded that the melting temperature and holding time were important to improve the J$\sub$c/ and the formation of the Y$_2$BaCuO$\sub$5/. In this paper, the melting temperature obtained was l120$^{\circ}C$ and propel holding time could be obtained as 20 minute and the more holding time was not effective in the J$\sub$c/ improvement as well as the formation of Y$_2$BaCuO$\sub$5/.