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采用主相为２２１２＋ＣａＣｕＯ２的所谓双粉作为前驱粉，用标准的粉末套管（ＰＩＴ）工艺制备了３７芯、６１芯和８５芯Ｂｉ－２２２３银包套多芯带材．研究发现：采用双粉装管缩短了２２２３成相时间，仅用４０ｈ即获２２２３纯相．前驱粉中较大尺寸２２１２片状晶的存在有益于Ｃａ，Ｃｕ传质和２２２３织构的提高．通过对加工工艺的精确控制，可有效防止芯丝的不均匀，清除妨碍长带制备的芯丝“香肠”状现象．首次实现了双粉法制备高性能的Ｂｉ－２２２３／Ａｇ长带，长带性能的均匀性和重复性都有较好保证．所制备的０．２４ｍｍ×４ｍｍ尺寸短样在７７Ｋ时Ｉｃ＝５３Ａ（Ｊｃ约为２．７×１０４Ａ／ｃｍ２），达国际先进水平，２０ｍ长样Ｉｃ＝３５Ａ，并实现批量化生产．
Using the so-called twin powder with 2212 + CaCuO2 as the precursor powder, 37 core, 61 core and 85 core Bi-2223 silver coated multi-core tapes were prepared by the standard powder casing (PIT) process. The study found that: the use of dual-powder tube shortening 2223 into phase time, only 40h that was 2223 pure phase. Precursor powder in the presence of large size 2212 lamellar crystals beneficial to Ca, Cu mass transfer and 2223 texture enhancement. Through the precise control of the processing technology, it can effectively prevent the unevenness of the core yarn and eliminate the “sausage” phenomenon of the core yarn which hinders the preparation of the long ribbon. For the first time, the high-performance Bi-2223 / Ag ribbons prepared by the dual-powder method are realized, and the uniformity and repeatability of the ribbons are well guaranteed. The prepared 0.24mm × 4mm size short sample has 77c when Ic = 53A (Jc is about 2.7 × 104A / cm2), reached the international advanced level, 20m long sample Ic = 35A, and achieve batch production.