Researches on the Optimization of Cold Pressing of Ag-clad Bi-2223 Superconducting Tapes
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摘要: 采用套管法(PET)制備Bi系高溫超導帶材,進行了冷壓工藝的優化研究。試驗結果表明,Bi系帶材所能承受的壓力有一個限值,若超過這個限值后,密度雖可提高,但晶粒破碎嚴重Jc值反而降低。帶材優化的冷壓工藝參數是838℃/60h+冷壓+838℃/60h冷壓+838℃/60h.第1次壓力為2GPa,第2次2.5GPa;冷壓壓下速率為1.5×10-4mm/s.同時研究還表明冷壓的主要作用是提高帶材的致密度和晶粒取向度,最終改善了帶材的超導性能。Abstract: Optimum researches of cold pressing of Ag-clad Bi-2223 superconducting tapes fabricated by Powder-in-tube method were carried out. Cold pressing was necessary to produce tapes with good texture and high Jc values. The optimum technical parameters are sintering three times at 838℃ for 60h and pressing twice with pressure 2.0GPa and 2.5GPa for the first and second compaction respectively. Reduction rate of cold pressing is 1.5×10-4mm/s. Meanwhile, experimental results exhibited that high density and degree of grain alignment of the tapes are mainly attributed to cold perssing.
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Key words:
- Bi-based superconducting tapes /
- cold pressing /
- critical current density
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