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在MgB2/Fe超导带材中,Fe包套与MgB2超导芯的交界处有很薄的反应层,其主要成分为Fe2B和FeB,其电阻率很高,导致当电流在基材和超导芯间转移时存在一个转移长度,在这一长度上会产生电压分布并伴随有焦耳热产生,从而影响到带材的临界电流测量和热稳定性.本文使用分布电阻模型分析了MgB2/Fe超导带材中的电流转移特点,推导出电流转移长度的公式及由于电流转移产生的焦耳热.并把电流转移产生的焦耳热加入到MgB2/Fe超导带材在绝热条件下失超传播的一维分析当中,推导出失超传播速度的公式,对超导带材失超传播速度的传统计算公式进行了改进.本文对研究MgB2/Fe复合超导带材的热稳定性分析及MgB2超导带材的实用化具有参考价值.
In MgB2 / Fe superconducting tapes, Fe cladding and MgB2 superconducting core at the junction of a very thin reaction layer, the main component of Fe2B and FeB, its high resistivity, resulting in the current in the substrate and super There is a transfer length between the transfer of the core, in this length will produce voltage distribution accompanied by Joule heat, thus affecting the critical current measurement and thermal stability of the strip.In this paper, the distribution of resistance model analysis of MgB2 / Fe Superconducting tape in the current transfer characteristics, derived the current transfer length of the formula and due to the current transfer Joule heat generated. And the current transfer Joule heat added to MgB2 / Fe superconducting tape quenched under adiabatic conditions In the one-dimensional analysis, the formula of quench propagation velocity is deduced and the traditional calculation formula of quench propagation velocity of superconducting tape is improved.In this paper, the thermal stability of MgB2 / Fe composite superconducting tape and the influence of MgB2 The practical application of superconducting tape has a reference value.