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以廉价的B4C粉和Mg粉为原料,用真空固相反应法成功制备了复相MgB2-B4C超导材料,通过X-射线和扫描电子显微镜分析了样品的成相和织构,除MgB2、B4C和MgB2C2外样品中未明显检测到其它杂相,其中MgB2相含量高达87.7%.电阻—温度特性测量表明,所制备的样品零电阻温度Tc(0)=31.5K,转变宽度(Tc=1.5K.零场10K下临界电流密度Jc>0.5×106A/cm2,在10K-5T下,Jc也可达到104A/cm2.实验表明较高含量的B4C不会严重削弱MgB2的超导电性,临界温度和载流能力仍然很高预示复相MgB2-B4C材料可作为一种廉价的实用超导材料.
The low-cost B4C powder and Mg powder were used as raw materials to prepare the complex MgB2-B4C superconducting material by vacuum solid-phase reaction. The phase and texture of MgB2-B4C were analyzed by X-ray diffraction and scanning electron microscopy. B4C and MgB2C2, the content of MgB2 phase was as high as 87.7%. The measurement of resistance-temperature characteristics showed that the zero resistance temperature Tc (0) = 31.5K and the transition width (Tc = 1.5 K. The critical current density Jc at 0.5 K at 10K is 0.5 × 106 A / cm2, and Jc can reach 104 A / cm2 at 10K-5 T. Experiments show that the higher content of B4C will not seriously impair the superconductivity of MgB2 and the critical temperature And the current carrying capacity is still high, indicating that the complex phase MgB2-B4C material can be used as a cheap practical superconducting material.