【摘要】 Bi-2212(Bi2Sr2CaCu2Ox)线材具有优异的低温高场性能,线材的各向同性为磁体绕制提供方便,使其成为超高磁场磁体内插线圈的首选材料.本研究采用PIT技术与部分熔化工艺相结合的工艺制备Bi-2212/AgMn线材,系统研究熔化温度、降温速率以及低温保温时间后处理气氛等参数对线材相成分、微观结构及超导电性的影响,最终制备出临界电流密度Jc达到14.7kA/cm2(77K,self)的Bi-2212多芯线材.更多还原

【Abstract】 At low temperature and high field,Bi-2212 wires have the highest engineering critical current density(Je) ,and the isotropic round wires are more easily to design solenoid than the tapes. So the Bi-2212 Wires are the preferred conductor for high-field solenoids. The multi-core Bi-2212/Ag wires were fabricated by combination of powder -in-tube and partial melting process. In this study,the melting temperature,the cooling rate and keeping time of Bi-2212 wires for the partial melting heat treatment process were optimized. The effect of post-annealing atmosphere on Jc on Tc was investigated. The final Bi-2212 wires reached the critical current density Jc of 14.7kA/mm2 at the 77K and self-field.更多还原