【摘要】 采用粉末套管法制备了单芯,7芯,49芯和343芯Bi_1.8Pb_0.4Sr₂Ca_2.2Cu₃,O_x/Ag 复合带材,并研究了热处理条件,加工方式和弯曲应变对带材超导性能和组织结构的影响.研究表明,带材 J_c 对烧结温度十分敏感,在845℃附近作200h 烧结热处理,其 J_c 都有最大值.采用反复压制和烧结的工艺,可有效地改善带材的 J_c,其中49芯带材 J_c（77K,0T）=1.5×10⁴A/Cm²和 J_c（77K,1T）=1.20×10³A/cm².在弯曲应变状态下,带材的 J_c 与其芯数密切相关,随着芯数增加,带材抗应变性能改善,其中343芯带材,当弯曲应变为～1%时,J_c 仍达无弯曲应变时的～70%,为单芯带材的5倍多.更多还原

【Abstract】 Single core, 7 core, 49 core and 343 core multi-filamentary Bi(2223)/Ag tapes were fabricated by powder in tube method. The effects of heat treatment, cold working and bending strain on superconducting properties and microstructure were also investigated. It was shown that the sintering temperature was very sensitive to Jc of the tapes. The most effective sintering temperature was near 845℃. The intermediate pressing and sintering process was beneficial for improvement of Jc. The best Jc value has reached 1.5×104 A/cm2 (77K, OT), 1.2X 103 A/cm2 (77K, 1T) respectively for 49 core tape. When the core number increased, the strain resistant property of tapes was also improved. The Jc of 343 core tape after a strain up to 1% proved to sustain about 70% of Jc with zero strain, which is five times as that of single core tape.更多还原