制备YBa_2Cu_3O_(7-δ)/Ag自润滑复合材料及性能  

Preparation and Properties of YBa_2Cu_3O_(7-δ)/Ag Self-Lubricating Composite

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

机构地区：[1]江苏大学材料摩擦学省重点实验室,江苏镇江212013

出　　处：《稀有金属材料与工程》2008年第A01期240-243,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金资助(50372026)

摘　　要：为制备出从低温到高温宽范围内使用的固体润滑材料,分别以纯Ag和AgNO_3的方式向高温超导材料YBa_2Cu_3O_(7-δ)中掺杂金属银,制备出了具有超导性能、一定的机械性能和摩擦学性能的氧化物基复合材料,对其组织和性能进行了研究,重点分析了其增韧机理和减摩耐磨机理。研究发现,分布于晶粒间的Ag微粒有效抑制裂纹的萌生和扩展,从而改善了氧化物陶瓷YBa_Cu_3O_(7-δ)的脆性;常温和高温下,复合材料都表现出低而稳定的摩擦因数,软金属膜+硬基体是其减摩耐磨机理;由AgNO_3制备出的复合材料基体内Ag微粒的粒径更小,分布更加均匀,团聚少,表现出更好的综合性能。YBa2Cu3O7-δ/Ag self-lubricating composite was prepared by doping Ag using the metallic Ag powder or AgNO3 crystal. The composite exhibited excellent superconductivity, mechanical properties and tribological properties. The tribological properties of the composite were investigated on UMT-2 multi-function friction and wear tester from ambient temperature to 500℃ in air. The composite of mass content of 5% Ag exhibited better tribological properties. The Ag-films provided antifriction by generating a contact zone in the composite. The composites of the finer and dispersive Ag particles in matrix was obtained from the AgNO3 crystal and showed better overall properties.

关 键 词：YBA2CU3O7-Δ AG AGNO3 自润滑 掺杂 

分 类 号：TB33[一般工业技术—材料科学与工程]