LaF_3与MoS_2对镍铬基复合材料摩擦学特性的影响  

Effect of LaF_3 and MoS_2 on Tribological Properties of Ni-Cr Based Composite

作　　者：董丽荣[1] 李长生[1] 丁巧党[1] 姜春华[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：《润滑与密封》2007年第10期55-58,61,共5页Lubrication Engineering

摘　　要：利用粉末冶金方法制备了含不同LaF3和MoS2添加量的Ni-Cr基自润滑复合材料,对其组织和摩擦学性能进行了研究。结果表明,LaF3和MoS2的质量分数分别为5%和20%时,试样的摩擦磨损性能最好,即协同效应最优,从室温至700℃摩擦学测量表明复合材料具有较低摩擦因数;XRD、SEM、XPS、金相分析表明:摩擦作用下,在试样表面形成MoS2膜及在对偶件表面上形成MoS2转移膜是其减摩机制,高温下(400～700℃),MoS2受热氧化分解,Mo元素同基体生成氧化物NiMoO4、S元素与基体生成硫化物共晶体及与LaF3协同作用是复合材料摩擦因数进一步降低的原因。Ni-Cr based self-lubricating composites with various proportions of LaF3 and MoS2 as lubricants were prepared by the metallurgic method. Their triobological properties were measured on CETR UMT-2 Multi-Specimen Test System range from 20℃ to 700 ℃ in air. The results show that the composite has good triobological properties as the mass contents of MoS2 and LaF3 are 20% and 5% respectively,and the friction coefficient of the composite is lower. The structures and morphologies of the composite were studied by XRD, SEM and XPS. The results show that two MoS2-films are formed at room temperature, which are the MoS2 thin film formed on the contact zone of composites and the MoS2 transfer film formed on its counterface, so the composites have good antifriction performance. The oxide NiMoO4 and sulfured eutectic are formed due to reaction between MoS2 and Ni-Cr alloy at high temperature （400 - 700℃）. The synergistic effects of oxide NiMoO4, sulfured eutectic and LaF3 are the reason that the composites have lower friction coefficient.

关 键 词：Ni-Cr基自润滑复合材料 LaF MOS2 摩擦学性能 协同效应 

分 类 号：TB33[一般工业技术—材料科学与工程]