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브론즈법으로 제작한 V3Ga 초전도체의 결정성장 및 임계전류밀도 특성
오상수,장촌광조 대한금속재료학회(대한금속학회) 1992 대한금속·재료학회지 Vol.30 No.10
The effects of Mg, Zr addition to Cu-Ga allloy on the crystal growth and the critical current density have been investigated for the V₃Ga composite sheet superconductor prepared by bronze method. The crystal growth of V₃Ga compound was found to be enhanced by Mg addition and overall growth of compound layer was confirmed to be controlled by bulk diffusion of Ga in compound layer. Critical current density was improved by Mg addition because of increase in elementary pinning force and upper critical magnetic field(B_(c2)). The degradation ratio of critical current density in high magnetic fields became small for long time annealed specimen. In low magnetic fields, it was confirmed that the global pinning force density increases with decreasing the grain size.
Ag 시스 Bi-Pb-Sr-Ca-Cu-O 세라믹 초전도 테이프의 임계전류밀도에 미치는 가공열처리의 영향
오상수,장촌광조 대한금속재료학회(대한금속학회) 1991 대한금속·재료학회지 Vol.29 No.4
In order to investigate the influence of cold-working degree and thermomechanical treatment cycle on the critical current density(Jc), magnetic field dependence of Jc and microstructure of Ag sheathed Bi-Pb-Sr-Ca-Cu-O ceramic superconducting tapes, various types of specimens were prepared by powder-in-tube method. By means of XRD and EPMA, major 2223 phase, minor 2212phase and impurity phases such as Ca₂PbO₄, CuO and (Sr, Ca)₃Cu_5O_x were confirmed to exist in oxide layer. It was made clear that the critical current density strongly depends on the degree of cold-working and the number of TMT cycle. This is attributed to the refining of microstructure such as densification and preferred orientation of c plane in 2223 superconducting phase. Magnetic field dependence of critical current density could be improved for BPSCCO tapes prepared with the higher degree of cold-working.