원문정보
Characteristics of Bi2212 Round-wire Depending on Heat Treatment Condition
초록
영어
The characteristics of Bi2212 round wire was systematically studied depending on different heat treatment conditions. Initial wire was drawn after routine PIT (Powder In Tube) process. The wire was divided into 3 pieces with 10 cm in length and 2.5 mm in diameter, 3 wires were pre-heat treated separately by different heat treatment schedules, heated in air and nitrogen atmosphere and centrifugally melted. Pre-heated wires were annealed at 845 "C for 40 hours in oxygen atmosphere. SEM results indicate that all pre-heated wires showed highly oriented microstructure. However the wire by centrifugally melted process showed higher density and better electric properties as compared with 2 other wires pre-heated in air and nitrogen atmosphere. The critical current of a centrifugally melted wire was about 18 A in 77 K.
목차
1. 서론
2. 실험 방법
2.1 분말의 특성 분석
2.2 Round wire 제작
2.3 분위기에 따른 사전 열처리
2.4 특성 분석
3. 결과 및 고찰
3.1 미세 구조
3.2 은 피복과 초전도체와의 결합
3.3 XRD 결과
3.4 I-V 특성
4. 결론
참고문헌
저자소개