镀钨碳纳米管/铝复合材料的摩擦磨损性能

FRICTION AND WEAR PROPERTIES OF TUNGSTEN-COATED CARBON NANOTUBES/ALUMINUM COMPOSITES

采用球磨混粉和放电等离子体烧结制备了镀钨碳纳米管/铝(W-CNTs/Al)复合材料,对复合材料组织形貌进行了透射电镜和扫描电镜观察,研究了W-CNTs含量和摩擦实验载荷对复合材料摩擦系数、磨损量和表面磨损形貌的影响。结果表明:低含量的W-CNTs可实现在Al基体中的良好分散,但高含量的W-CNTs会形成团聚体。随W-CNTs含量增加,复合材料的摩擦系数和磨损量均先减小后增加,且当W-CNTs含量为0.75%(质量分数)时,复合材料的摩擦系数和磨损量较纯Al分别降低了24.4%和39.1%。随实验载荷增加,复合材料摩擦系数变化不明显,但磨损量增大显著,材料表面磨损粗糙度也增加。

In the present study the tungsten-coated carbon nanotubes(W-CNTs)/aluminum composites were realized by ball milling and spark plasma sintering.The microstructures and morphologies of composites were characterized by transmission electron microscope and scanning electron microscope.The influences of W-CNTs content and applied load on friction coefficient,wear loss and wear morphology were investigated.The results showed that low-content W-CNTs resulted in its good dispersion within Al matrix,while high-content W-CNTs formed clusters in the composites.With an increasing W-CNTs content,the friction coefficient and wear loss of composites decreased first and then increased.Compared with pure Al specimen,the friction coefficient and wear loss of W-CNTs/Al composites(content of W-CNTs corresponding to 0.75 wt.%) decreased by 24.4% and 39.1%,respectively.The friction coefficient did not vary obviously with rising applied load,while the wear loss significantly increased,and the roughness of wear surface increased as well.