Preparation and low-temperature experimental testing of low-resistance joints in Bi-2212
The preparation and application of low-resistance joints are beneficial for enhancing the stability and magnetic field quality of superconducting magnets.Bi-2212 low-resistance joints were prepared using the high-temperature silver wire sintering method.Low-temperature experimental testing was conducted to measure the critical current of different compressed flat Bi-2212 samples and the high-temperature silver wire sintered joints.The effects of key factors such as magnetic field strength,contact length,and overlap area on joint resistance were analyzed.Experimental results indicate that Bi-2212 joints prepared using the novel joint preparation technique can achieve a resistance of 4.5 × 10-8 Ω when the length reaches 30 mm and the overlap area reaches 32.7 mm2 under a 4.2 K,5 T background magnetic field environment,and tend to stabilize,with negli-gible influence from the magnetic field.
NETL
NSTL
万方数据
