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利用氧分压分析法对(Bi,Pb)2Sr2Ca2Cu3Ox超导前驱粉的放氧量进行了定量计算,并考察了放氧量对Bi-2223带材临界电流密度Jc的影响。结果表明,前驱粉中富Pb相Ca2PbO4(简称CP)和(Pb,Bi)3Sr2Ca2CuOy(简称3221)的总量增加或CP相与3221相含量的比(CP∶3221)下降,都导致放氧量增加。放氧量与Jc之间存在直接对应关系:当放氧量为0.32mL/g时带材的Jc最高,放氧量过高或过低均对Jc不利。相应地,可以通过定量计算前驱粉的放氧量预测带材的Jc,进而鉴定前驱粉性能。
The oxygen partial pressure of (Bi, Pb) 2Sr2Ca2Cu3Ox superconducting precursor powder was quantitatively calculated by oxygen partial pressure analysis, and the effect of oxygen release on the critical current density Jc of Bi-2223 strip was investigated. The results show that the total amount of Pb-rich phase Ca2PbO4 (abbreviated as CP) and (Pb, Bi) 3Sr2Ca2CuOy (referred to as 3221) or the ratio of CP phase to 3221 phase (CP: 3221) . There is a direct correspondence between the amount of oxygen release and Jc: when the oxygen release amount is 0.32mL / g, the highest Jc of the strip, oxygen release is too high or too low are negative Jc. Accordingly, Jc of the strip can be predicted by quantitatively calculating the oxygen release amount of the precursor powder to further identify the precursor powder properties.