Recently, there have been sustained efforts to develop novel epoxy composites including various fillers for improving the physical properties of the epoxy-impregnated superconducting coil. Among the various filler materials, carbon nanotubes (CNTs) have emerged as one of the promising candidates because of the high thermal conductivity as well as the superior mechanical strength. However, achieving the desired thermal and mechanical properties of CNT/epoxy composites is difficult due to poor dispersion of CNT fillers in epoxy resins. Therefore, the uniform dispersion of CNTs should be obtained through surface treatments such as acid treatment and amine treatment, to enhance the physical properties of superconducting coils impregnated with epoxy composites using the CNT fillers. In this study, the thermal and electrical characteristics of GdBCO coils impregnated with epoxy composites containing surface-treated CNT fillers were evaluated through the thermal quench, over-current, and repetitive cooling tests. In addition, the degree of dispersion of the CNT fillers in the epoxy resin was examined through scanning electron microscope (SEM) analysis.
Acknowledgement: This work was supported by the Materials and Components Technology Development Program of KEIT [10053590, Development of MgB2 wire and coil with a high critical current and long length for superconducting medical-electric power equipment] and in part by the Korea Basic Science Institute under Grant D37614.
|Submitters Country||Republic of Korea|