| 热处理对Bi超导带材微结构和J_C值的影响 |
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| 引用本文： | 刘军华.热处理对Bi超导带材微结构和J_C值的影响[J].航空学报,1994,15(4):458-461. |
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| 作者姓名： | 刘军华 |
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| 作者单位： | 北京航空航天大学制造工程系,北京,100083 |
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| 摘 要： | 采用粉末装管加工技术（Ｐｏｗｄｅｒ－ｉｎ－ｔｕｂｅｔｅｃｈｎｉｑｕｅ）制备出了ＢｉＰｂＳｒＣａＣｕＯ／Ａｇ复合超导带材。研究了热处理对带材微观结构和临界电流密度（Ｊ＿ｃ）的影响。试验表明,合理的热处理温度范围为８４０～８５０℃,冷却速率为５０～１００℃／ｈ。
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| 关 键 词： | 高温超导体 热处理 微观结构 电流密度 |
| 收稿时间： | 1992-05-03 |
| 修稿时间： | 1992-10-28 |
EFFECTS OF TREATMENT ON MICROSTRUCTURE AND CRITICAL CURRENT DENSITY OF Bi SERIES SUPERCONDUCTING TAPES |
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| Liu Junhua.EFFECTS OF TREATMENT ON MICROSTRUCTURE AND CRITICAL CURRENT DENSITY OF Bi SERIES SUPERCONDUCTING TAPES[J].Acta Aeronautica et Astronautica Sinica,1994,15(4):458-461. |
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| Authors: | Liu Junhua |
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| Institution: | Dept.of Manufacturing Engineering Beijing University of Aeronautics and Astronautics,Beijing,100083 |
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| Abstract: | The effects of heat treatment on the microstructure and the critical current density J_C of Ag-sheathed BiPbSrCaCuO(2223) superconducting tapes prepared by the powder-in-tube technique are investigated.The microstructure of oxide layer and the J_C values of the tape at 77K are strongly dependent on the heat treatment condition(temperature,time and cooling rate).The experimental results show that the optimum heat treatment temperature and cooling rate to maximize J_C values of the tape are in the range about 840-850℃ and 50-100℃/h respectively, and the J_C values of the tape increase with the prolongation of heat treatment time from 50h to 200h.If the temperature is higher than 850℃, the high Tc phase will partially go to melt.On the other hand, if the temperature is lower than 840℃,the high Tc phase might not completely form. Both of them reduce the J_C values of the tape. If the cooling rate is less than 50℃/h or greater than 100℃/h,the J_C values of the tape will also decrease. |
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| Keywords: | high-temperature superconductors heat treatment microstructure current density |
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