초록 ▼

본 연구에서는 고온초전도 선재 제조를 위하여 Ag 및 Ag-합금 피복재를 개발하고, 선재시의 중요공정변수인 전조분말과 기계적 가공공정, 열·기계적 처리공정에 따른 특성변화를 고찰하여 고성능 고온초전도 선재를 개발한 후 이를 사용하여 고온초전도자석을 설계 ·제작한 후 그 운전특성을 평가하였는데 연구 연차가 증가할수록 더욱 고성능이면서 더욱 긴 고온초전도 선재를 제조하여 이를 이용하여 더욱 더 높은 자장을 탄생할 수 있는 자석을 제작하였으나, 너무나 부족한 연구비의 지원으로 인하여 27 K에서 2 T의 자장을 발생하는 실용화급의 자석이

본 연구에서는 고온초전도 선재 제조를 위하여 Ag 및 Ag-합금 피복재를 개발하고, 선재시의 중요공정변수인 전조분말과 기계적 가공공정, 열·기계적 처리공정에 따른 특성변화를 고찰하여 고성능 고온초전도 선재를 개발한 후 이를 사용하여 고온초전도자석을 설계 ·제작한 후 그 운전특성을 평가하였는데 연구 연차가 증가할수록 더욱 고성능이면서 더욱 긴 고온초전도 선재를 제조하여 이를 이용하여 더욱 더 높은 자장을 탄생할 수 있는 자석을 제작하였으나, 너무나 부족한 연구비의 지원으로 인하여 27 K에서 2 T의 자장을 발생하는 실용화급의 자석이 아닌, 4.2 K에서 1 T의 자장을 발생하는 자석밖에 연구할 수 없어 4.2 K-운전 고온초전도 자석 기술만으로 그 연구가 제한되었음.

Abstract ▼

Up to now, equipments measuring physical propel·ties of materials in high magnetic fields such as physical property measurement systems (PPMS), ac susceptometers, superconducting quantum interference devices (SQUID) . vibrating sample magnetometers (VSM), nuclear magnetic resonance spectrometers (NM

Up to now, equipments measuring physical propel·ties of materials in high magnetic fields such as physical property measurement systems (PPMS), ac susceptometers, superconducting quantum interference devices (SQUID) . vibrating sample magnetometers (VSM), nuclear magnetic resonance spectrometers (NMR), torque meter and so on. have operated by paying high operational and maintenance cost due to using expensive liquid helium as a coolant leer maintaining low-Tc superconducting magnet at 4.2 K, which is a main component of the equipment and generates high fields. The present study was performed in order to lower the operational and maintenance cost by developing high-Tc superconducting. (HTS) magnets which operate at 27 K and then replacing the existing low-Tc superconducting magnets by them. The original purpose of the present study was the development of HTS magnet generating 2 T at 27 K, but reduced to HTS magnet generating 1 Tat 4.2 K due to tremendous budget cut, so that operational characteristics of HTS magnet at medium temperatures near 27 K had not been studied.
The present study for the development of the HTS magnet can be divided into two kinds, One is the studios to prepare HTS tapes with high current-carrying capacity by establishing optimum preparation process. It includes studies on preparation of Ag or Ag-alloy tube to be used for sheathing materials of the tapes. effects of precursor powders on current-carrying capacity of the tape. effects of reduction rates during mechanical working on uniformity of mono- and multi-filamentary tapes and effects of heat-treatment temperature and duration time and reduction rate during thermo-mechanical treatment on uniformity and current-carrying capacity of the tape. As results of those studies, long 19- and 39-filamentary tapes over 100 m with Jc′s of 10,000∼20.000 A/cm²at 77 K and in self-fields wet·e developed.
Another is the design and fabrication of HTS magnet using the HTS tapes and studios of operational characteristics and stability of the magnet. As the length and current-carrying capacity of HTS tapes prepared in each year in the present research project was restricted by the budget, the size and the generating field of the magnet was also restricted. However, magnets of which the size and the generating field increased with increasing the fiscal year, were fabricated and tested. The distribution of each component of the field was stimulated using FLUX-2D or OPERA-2D software. The operational characteristics and the stability of the magnet generating 0.6 T at 4.2 K were successfully investigated in the third fiscal year. Finally a magnet generating 1 T at 4.2 K was successfully fabricated in the last fiscal year, and identified that it generated a central field of 0.98 T and a maximum field of 1.18 Tat Ic of 82.88 A at 4.2 K.

목차 Contents

• 표지 ...1
• 제출문 ...2
• 요약문 ...4
• SUMMARY ...6
• CONTENTS ...8
• 목차 ...10
• 제1장 서 론...12
• 1-1절 연구개발의 목적...12
• 1-2절 연구개발의 필요성...13
• 1-3절 연구개발 범위...15
• 제2장 국내외 기술개발 현황...16
• 제3장 연구개발수행 내용 및 결과...19
• 3-1절 고온초전도 선재의 피복재 개발 연구...19
• 3-2절 Precursor powder 연구...22
• 3-3절 단척 단심선재 제조공정 연구...26
• 3-4절 장척선재 제조 연구...33
• 3-5절 자석 설계와 제작, 운전특성 평가 연구...71
• 3-6절 고온초전도 선재의 자기적 특성 평가...100
• 제4장 연구개발목표 달성도 및 대외기여도...123
• 4-1절 연구개발목표 달성도...123
• 4-2절 관련분야의 기술발전에의 기여도...124
• 4-3절 특허와 발표 논문목록...125
• 제5장 연구개발결과의 활용계획...131
• 제6장 참고문헌...132