PHASE-EQUILIBRIA IN THE Y-BA-CU-O SYSTEM AND MELT PROCESSING OF AG CLAD Y1BA2CU3O7-X TAPES AT REDUCED OXYGEN PARTIAL PRESSURES
PHASE-EQUILIBRIA IN THE Y-BA-CU-O SYSTEM AND MELT PROCESSING OF AG CLAD Y1BA2CU3O7-X TAPES AT REDUCED OXYGEN PARTIAL PRESSURES
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DOI：
10.1016/0921-4534(94)02369-7
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发表时间：
1995-01-15
期刊：
影响因子：
1.7
通讯作者：
BEYERS, RB
中科院分区：
文献类型：
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作者：
MACMANUSDRISCOLL, JL;BRAVMAN, JC;BEYERS, RB
我们对 Y1Ba2Cu3O7-x (+ Ag) 和 BaCu2O2 (+ Ag) 在 780°C-950°C 的温度范围和 1.0 X 10(-6) -2.0 X 10(-1) atm 的氧分压范围内进行了相稳定性研究。发现 Ag 对任一相的热力学稳定性没有影响。在低至 800 摄氏度 +/- 10 摄氏度的温度下发现 YBCO 部分熔化，在低至 900 摄氏度 +/- 10 摄氏度的温度下发现显着的包晶熔化。这些热化学研究使我们能够确定银包 Y1Ba2Cu3O7-x 颗粒和带材的低温减压 (RTP) 加工的最佳条件。通过在固定温度下控制氧分压进行熔体加工，产生了在短长度上具有强纹理的经典域结构。 RTP法的优点是可以控制第二相Y2BaCuO5的粒径。此外，该技术有望生产出具有高载流能力的长长度柔性Y1Ba2Cu3O7-x带。
We have undertaken phase-stability studies of Y1Ba2Cu3O7-x (+ Ag) and BaCu2O2 (+ Ag) over the temperature range 780 degrees C-950 degrees C and oxygen partial pressure range 1.0 X 10(-6) -2.0 X 10(-1) atm. Ag was found to have no effect on the thermodynamic stability of either phase. Partial melting of YBCO was found at temperatures as low as 800 degrees C +/- 10 degrees C, with significant peritectic melting at temperatures as low as 900 degrees C +/- 10 degrees C. These thermochemical studies have enabled us to determine the optimum conditions for reduced temperature and pressure (RTP) processing of Ag clad Y1Ba2Cu3O7-x pellets and tapes. The classic domain structure with strong texturing over short lengths was produced in samples melt processed by controlling oxygen partial pressure at a fixed temperature. The RTP method has the advantage that the second phase Y2BaCuO5 particle size can be controlled. Moreover, the technique offers the promise of long lengths of flexible Y1Ba2Cu3O7-x tapes with high current carrying capability.