不同合金基体Bi2223带材传输损耗的测量和分析

AC Transport Losses Measurement and Analysis of Bi-2223/Ag Tapes With Different Alloy Matrix

减少交流损耗可以通过带材的扭绞、铠装层采用合金材料或在芯线之间引进一个电阻层来实现。为了研究高阻值基体材料对交流传输损耗的影响,准备了6个具有不同合金基体的Bi2223带材。在77 K下,测量了6个样品基体的电阻率,研究了Ag合金基体对Bi-2223带材交流传输损耗的影响。研究发现,在I0<Ic条件下,Ag合金基体能够减小交流传输损耗。在77 K下,测量了6个样品的n值,研究了各种铠装的BSCCO带的抗拉强度对n值的影响。同时,研究了交流传输损耗对n值的依赖性。

The reduction of AC losses can be achieved by twisting of the tapes, alloying of the sheath or introducing a resistive barrier between the filaments. In order to study the effect of higher-resistivity matrix materials on the AC transport losses, six Bi2223 tapes with different alloy matrix have been prepared. Ag-alloy matrix resistivities of six samples were measured and the effect of Ag-alloy matrix on AC transport loss of Bi2223 tapes was investigated in 77 K. It was found that Ag-alloy matrix could decrease AC transport current losses for Io〈Ic. The n values of six samples were measured and the effect of tensile stress of variably sheathed BSCCO tapes on the n values was investigated in 77 K. Meanwhile, the dependence of AC transport losses on the n values was also investigated.