We applied the addition of both SiC and liquid aromatic hydrocarbon to the internal Mg diffusion (IMD) processed MgB2 wires. The liquid aromatic hydrocarbons used in this work are toluene, p-ethyltoluene and p-dimethylbenzene. The engineering critical current density (Je) and the critical current density (Jc) calculated for the cross-sectional areas of the reacted layer are compared to those of the IMD processed wires without aromatic hydrocarbon addition. All wires with co-addition of aromatic hydrocarbon and SiC show much smaller field dependence of Je (J c)-B curve similarly to the wires with only SiC addition and, hence, larger Je (Jc) in high magnetic fields compared to the wires processed from pure B. Furthermore, the SiC + toluene co-added wires show larger Je and Jc values in entire magnetic fields which is independent of the heat treatment temperature while that of the other co-added wires is depending on the heat treatment temperature. The highest Je and Jc at 4.2 K and 10 T obtained in this work are 3700 A/cm 2 and 48,000 A/cm2, which were achieved for the SiC + dimethylbenzene co-added wires heat treated at 670 °C and the SiC + toluene co-added wires heat treated at 640 °C. Those results indicate that the co-addition of SiC and liquid aromatic hydrocarbon is one of the promising methods to improve the Jc as well as Je of the IMD processed MgB2 wires.
- Critical current density
- IMD process
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering