镧对Cu/Ti3SiC2/C/MWCNTs/Graphene/La纳米复合材料摩擦学性能的影响

Effect of La content on tribological behaviors of Cu/Ti3SiC2/C/MWCNTs/Graphene/La nanocomposites

摘要:

本研究采用真空热压及热等静压方法制备Cu/Ti3SiC2/C/MWCNTs/Graphene/La纳米复合材料，采用摩擦磨损试验机研究对磨材料为GCr15时，镧含量对Cu/Ti3SiC2/C/MWCNTs/Graphene/La纳米复合材料的摩擦学性能的影响。研究了镧含量、正应力及旋转速度对纳米复合材料摩擦学行为的影响并揭示其相互作用机理，采用正交试验分析、方差分析及极差分析法来分析镧含量、正应力及旋转速度的相互作用。采用扫描电镜和能谱仪观察并分析磨损表面及磨削的形态及成分组分。研究结果表明镧对纳米复合材料的摩擦磨损性能起到首要作用，当镧的质量分数为0.05%时，复合材料的磨损机理为磨粒磨损、剥层磨损和氧化磨损，而当镧的质量分数为0.1%和0.3%时，复合材料的磨损机理为粘着磨损和氧化磨损。

Abstract:

Cu/Ti3SiC2/C/MWCNTs/Graphene/La nanocomposites were fabricated by vacuum hot-pressing sintering and hot isostatic pressing. Effect of lanthanum (La) content on tribological behavior of Cu/Ti3SiC2/C/MWCNTs/Graphene/La nanocomposites against GCr15 was evaluated using a wear and abrasion tester. Effect of La content, normal force and rotational speed on tribological behavior of the nanocomposite was investigated to analyze their interaction mechanism. The mutual influence of La content, normal force and rotational speed was analyzed by orthogonality analysis, variance analysis and range analysis. The morphologies of worn surfaces have been observed and analyzed by means of scanning electron microscope (SEM) and energy dispersive x-ray spectroscopy (EDS). Results demonstrate that La content plays a primary role in the influence of friction and wear performance results. The wear mechanism of nanocomposites with 0.05 wt.% La is abrasive wear, delamination wear and oxidation wear. And wear mechanism of nanocomposites with 0.1 wt.% and 0.3 wt.% La is adhesive wear and oxidation wear.