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研究了银包套铋系氧化物超导体带材的两种连接方式:针焊和超导带材芯部氧化物陶瓷烧结焊。钎焊是用铟或锡钎焊接,其接头存在一定的接头电阻;烧结焊是将未经烧结的加工态银包套带材端部剥去一层银层,露出氧化物陶瓷,再将两根露出部分压(轧)接在一起,经与带材相同的烧结工艺进行烧结迟火处理。反复压制、烧结,氧化物陶瓷间发生扩散反应达到连接效果。接头临界电流采用多电位引线法进行测试,接头的临界电流密度达到带材自身的60%。结合对焊接接头的微观结构分析,提出了改进焊接接头性能的方法。 相似文献
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研究了用银包套法制备单芯、加银粉及多芯三种铋系带材的成型工艺、热处理工艺、临界电流密度、微观结构以及J_c-B特性与微观结构的关系。并进一步探讨了三种带材的机械稳定性。 相似文献
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The process to obtain high T(110K)phase quickly,the microstructure and properties of Ag-sheathedBi(Pb)-Sr-Ca-Cu-O superconductor tapes have been studied.It was found that the formation time of the highT_c phase was greatly shortened by the addition of more Ca and Cu to the nominal composition of Bi(Pb):Sr:Ca:Cu=2:2:2:3 and the adoption of appropriate sintering temperature and cooling rate.Superconductor powder with predominant high T,phase was prepared after a 840 C/50 h treatment.The Jof the Ag-sheathed tapes and the magnetic field dependence of Jwere obviously improved by repeatedly pres-sing and sintering.The maximum transport current density at 77K in a zero magnetic field was 12,200 A/cm~2.The magnetic dependence of Jwas summarized as follows:6.450 A/cm~(2)(B⊥1.B∥S.0.1T)1,810 A/cm~2(B⊥1.B∥S,1T),390 A/cm~2(B⊥1.B∥S,2T)(B:magnetic field.1:electric current.S:surface of tapes).Theimprovement of Jwas attributed to the formation of the plate-like structure with homogeneous compositiondistribution and the strong c-axis texture. 相似文献
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