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为适应20℃~-200℃温度的适用范围,采用固相法制备了Bi1.6Pb0.4Sr2Ca2Cu3O10-x超导材料,用摩擦磨损试验机测试了Bi1.6Pb0.4Sr2Ca2Cu3O10-x从液氮温度至室温的摩擦学性能。结果表明:在室温20℃下,Bi1.6Pb0.4Sr2Ca2Cu3O10-x与对偶件轴承钢盘对摩时,摩擦系数约为0.35,当温度降到超导转变温度以下时(液氮温度-170℃)摩擦系数大幅度降低,Bi1.6Pb0.4Sr2Ca2Cu3O10-x超导态摩擦系数为正常态值的一半,实验证明了电子激励对摩擦能量耗散的作用。为改善室温下Bi1.6Pb0.4Sr2Ca2Cu3O10-x摩擦学性能,掺杂不同质量分数Ag作为润滑组元,制备了Ag/Bi1.6Pb0.4Sr2Ca2Cu3O10-x超导固体润滑复合材料,取得良好耐磨减摩效果。Ag掺杂不影响Ag/Bi1.6Pb0.4Sr2Ca2Cu3O10-x复合材料的超导性,在正常载荷和滑动速度下10 wt%Ag/Bi1.6Pb0.4Sr2Ca2Cu3O10-x复合材料摩擦系数为0.20.3,磨损率为4.57×10-4mm3.(N.m)-1。
In order to meet the applicable range of temperature from 20 ℃ to -200 ℃, Bi1.6Pb0.4Sr2Ca2Cu3O10-x superconductors were prepared by solid-state method. The friction coefficient of Bi1.6Pb0.4Sr2Ca2Cu3O10-x from liquid nitrogen to room temperature Tribological properties. The results show that the coefficient of friction of Bi 1.6Pb 0.4Sr 2Ca 2 Cu 3 O 10-x is about 0.35 with the counter bearing steel plate at room temperature 20 ℃. When the temperature is below the superconducting transition temperature (liquid nitrogen temperature -170 ℃) The coefficient of friction is greatly reduced, the friction coefficient of Bi1.6Pb0.4Sr2Ca2Cu3O10-x superconducting state is half of the normal value, and the effect of electron excitation on the frictional energy dissipation is proved experimentally. In order to improve the tribological properties of Bi1.6Pb0.4Sr2Ca2Cu3O10-x at room temperature and doped with different mass fractions of Ag as lubricating components, a Ag / Bi1.6Pb0.4Sr2Ca2Cu3O10-x superconducting solid lubricant composite was prepared and a good wear-resistant and friction-reducing effect. Ag doping did not affect the superconductivity of Ag / Bi1.6Pb0.4Sr2Ca2Cu3O10-x composites. The friction coefficient of 10wt% Ag / Bi1.6Pb0.4Sr2Ca2Cu3O10-x composites at normal load and sliding speed was 0.20.3, wear The rate was 4.57 × 10 -4 mm 3. (Nm) -1.