Kostecki Marek, Woźniak Jarosław, Cygan Tomasz, Petrus Mateusz, Olszyna Andrzej
Faculty of Materials Science and Engineering, Warsaw University of Technology, Wołoska St. 141, 02-507 Warsaw, Poland.
Materials (Basel). 2017 Aug 10;10(8):928. doi: 10.3390/ma10080928.
Self-lubricating composites are designed to obtain materials that reduce energy consumption, improve heat dissipation between moving bodies, and eliminate the need for external lubricants. The use of a solid lubricant in bulk composite material always involves a significant reduction in its mechanical properties, which is usually not an optimal solution. The growing interest in multilayer graphene (MLG), characterised by interesting properties as a component of composites, encouraged the authors to use it as an alternative solid lubricant in aluminium matrix composites instead of graphite. Aluminium alloy 6061 matrix composite reinforced with 2-15 vol % of MLG were synthesised by the spark plasma sintering process (SPS) and its modification, spark plasma texturing (SPT), involving deformation of the pre-sintered body in a larger diameter matrix. It was found that the application of the SPT method improves the density and hardness of the composites, resulting in improved tribological properties, particularly in the higher load regime.
自润滑复合材料旨在获得能降低能耗、改善运动部件间散热并消除对外部润滑剂需求的材料。在块状复合材料中使用固体润滑剂总会使其机械性能大幅降低，这通常并非最佳解决方案。多层石墨烯（MLG）作为复合材料的一种成分具有有趣的特性，人们对其兴趣日增，这促使作者用它替代石墨作为铝基复合材料中的固体润滑剂。通过放电等离子烧结工艺（SPS）及其改进工艺——放电等离子织构化（SPT）（该工艺涉及在较大直径基体中对预烧结体进行变形），合成了含有2 - 15体积% MLG增强的6061铝合金基复合材料。研究发现，SPT方法的应用提高了复合材料的密度和硬度，从而改善了摩擦学性能，尤其是在高负荷工况下。
