2024铝合金微弧氧化/TiC复合膜的制备及耐磨性能

在含有TiC微粒的硅酸盐体系电解液中对2024铝合金进行微弧氧化处理,制备含有TiC成分的复合陶瓷膜。利用SEM、EDS、XRD观察分析复合陶瓷膜的微观形貌、膜层中主要成分沿截面方向的分布及膜层的相结构,用纳米压痕硬度仪、激光共聚焦显微镜、摩擦磨损试验机测量复合陶瓷膜的硬度、表面粗糙度及摩擦系数。观察磨痕形貌,采用激光共聚焦显微镜测量磨痕体积,评估磨损率。结果表明:与不含TiC微粒的电解液中制备的微弧氧化膜相比,复合陶瓷膜的硬度更高、摩擦系数更小、磨损率更低,复合陶瓷膜的磨损率仅为微弧氧化膜的1/12,耐磨性更好。

Preparation and Wear Resistance of Microarc Oxidation Composite Coatings Containing TiC Particles on 2024 Aluminum Alloy

2024 aluminum alloy was treated by micro-arc oxidation in the silicate system electrolyte with TiC microparticles and composite ceramic coatings with TiC composition were prepared. The surface morphology and the cross-section morphology of composite ceramic coatings were observed by SEM and the distribution of main components along with the cross-section direction was analyzed by EDS. The phase structure of composite ceramic coatings was analyzed by XRD. The hardness of composite ceramic coatings was measured by nano indentation hardness tester. The surface roughness of composite ceramic coatings was measured by laser confocal microscope. The friction coefficient of composite ceramic coatings was measured by friction and wear tester. The morphology of wear tracks was observed by SEM. The wear volume of ceramic coatings was measured by laser confocal microscope and the wear rate was evaluated. The results showed that compared with the ceramic coatings prepared in the silicate system electrolyte without TiC microparticles ,the hardness of composite ceramic coatings is higher,the friction coefficient of composite ceramic coatings is smaller,the wear rate of composite ceramic coatings is lower and is only 1/12 of ceramic coatings prepared in the silicate system electrolyte without TiC micro-particles and wear resistance is better.