超导PbO／YBa2Cu3O7-δ复合氧化物摩擦磨损性能  

Friction and wear behavior of the superconducting compound oxide of PbO/YBa_2Cu_3O_(7-δ)

作　　者：董丽荣[1] 李长生[1] 丁巧党[1] 王旻璐[1] 彭义[1] 

机构地区：[1]江苏大学材料摩擦学省重点实验室

出　　处：《复合材料学报》2008年第4期143-148,共6页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(50372026)

摘　　要：为适应从低温到高温宽温范围的使用条件,用溶胶-凝胶法制备了YBa2Cu3O7-δ超导材料,用摩擦磨损试验机测试了YBa2Cu3O7-δ从室温至液氮温度的摩擦学性能。结果表明:室温20℃下,YBa2Cu3O7-δ与对偶件不锈钢盘对摩时,摩擦因数在0.5左右,当温度降到超导转变温度以下时(液氮温度-196℃)摩擦因数大幅度降低,YBa2Cu3O7-δ超导态摩擦因数是正常态值的一半,实验直接证明了电子激励对摩擦能量耗散的作用。为改善室温下YBa2Cu3O7-δ摩擦学性能,掺杂不同质量分数PbO作为润滑组元,制备了PbO/YBa2Cu3O7-δ超导固体润滑复合材料,取得良好效果。PbO掺杂不影响PbO/YBa2Cu3O7-δ复合材料的超导电性,在正常的载荷和滑行速度下15%PbO/YBa2Cu3O7-δ复合材料摩擦因数为0.2至0.3,磨损率为4.35×10-4mm3.(N.m)-1,分析了PbO/YBa2Cu3O7-δ复合材料减摩耐磨机制。The superconducting material YBa2Cu3O7-δ samples were prepared by the sol-gel method. The tribological properties were measured on a friction and wear tester from ambient temperature to liquid nitrogen temperature. The results indicate that the friction coefficient of YBa2Cu3O7-δ against steeliness is about 0. 5 at ambient temperature and decreases abruptly to half of the normal state value when the temperature is below the superconducting transition temperature of the YBa2Cu3O7-δ. The measurements prove directly the effect of electronic excitation on friction. Moreover, PbO/YBa2Cu3O7-δ composite samples were prepared by sintering YBa2Cu3O7-δ with PbO at different mass fractions to improve the tribological properties of YBa2Cu3O7-δ at room temperature. The experimental results show that the friction coefficient of 15% PbO/YBa2Cu3O7-δ is about 0.2-0.3 and the wear rate is 4.35×10^-4 mm^3· （N ·m）^-1, and the superconductivity of 15% PbO/YBa2Cu3O7-δ is not degenerated. Finally, the anti-friction and anti-wear mechanism of PbO/YBa2Cu3O7-δ is discussed.

关 键 词：YBA2CU3O7-Δ PBO 复合材料 超导转变 摩擦学性能 

分 类 号：TB33[一般工业技术—材料科学与工程]