Friction and wear behavior of the superconducting compound oxide of Ag/Bi_1.6Pb_0.4Sr₂Ca₂Cu₃O_10-x

The superconducting Bi_1.6Pb_0.4Sr₂Ca₂Cu₃O_10-x samples were prepared by the solid-state synthesis method. The tribological properties were measured on the friction and wear tester from ambient temperature to liquid nitrogen temperature. The results indicate that the friction coefficient of Bi_1.6Pb_0.4Sr₂Ca₂Cu₃O_10-x against stainless steel is about 0.35 at the ambient temperature and decreases abruptly to half of the normal state value when the temperature is below the superconducting transition temperature of Bi_1.6Pb_0.4Sr₂Ca₂Cu₃O_10-x. The measurements prove directly the effect of electronic excitation on friction. Moreover，the Ag/Bi_1.6Pb_0.4Sr₂Ca₂Cu₃O_10-x composite samples were prepared by sintering Bi_1.6Pb_0.4Sr₂Ca₂Cu₃O_10-x with Ag at different mass fractions to improve the tribological properties of Bi_1.6Pb_0.4Sr₂Ca₂Cu₃O_10-x at room temperature. The experimental results show that the friction coefficient of 10 wt%Ag/Bi_1.6Pb_0.4Sr₂Ca₂Cu₃O_10-x is about 0.2~0.3 and the wear rate is 4.57 ×10^-4 mm³·(N·m)^-1，and the superconductivity of 10 wt% Ag/Bi_1.6Pb_0.4Sr₂Ca₂Cu₃O_10-x is not degenerated.