通过添加接近2D极限的石墨烯纳米片制备高耐磨和低摩擦Si3N4复合材料
Highly wear-resistant and low-friction Si3N4 composites by addition of graphene nanoplatelets approaching the 2D limit
摘要：
石墨烯纳米片（GNP）由于其优异的固体润滑性能以及机械和热稳定性而成为改善陶瓷复合材料摩擦学性能的最有前途的填料之一。然而，GNP的添加到目前为止仅提供了陶瓷的摩擦学性能的非常有限的改进，特别是关于它们的摩擦系数的降低。这很可能是由于通过暴露表面的高GNP覆盖率实现润滑和保护摩擦膜的挑战。在这里，我们表明，这可以通过有效地增加GNP的剥离度下降到几层（FL）的范围内实现。采用FL-GNP作为填料，Si_3N_4复合材料的耐磨性可提高约20倍，摩擦系数降低近一半，而其它力学性能也得到保持或提高。使用共焦拉曼显微镜，我们能够证明已经在5重量% FL-GNP含量下形成连续的FL-GNP摩擦膜。
英文摘要：
Graphene nanoplatelets (GNPs) have emerged as one of the most promising filler materials for improving the tribological performance of ceramic composites due to their outstanding solid lubricant properties as well as mechanical and thermal stability. Yet, the addition of GNPs has so far provided only a very limited improvement in the tribological properties of ceramics, particularly concerning the reduction of their friction coefficient. This is most likely due to the challenges of achieving a lubricating and protecting tribo-film through a high GNP coverage of the exposed surfaces. Here we show that this can be achieved by efficiently increasing the exfoliation degree of GNPs down to the few-layer (FL) range. By employing FL-GNPs as filler material, the wear resistance of Si3N4 composites can be increased by about twenty times, the friction coefficient reduced to nearly its half, while the other mechanical properties are also preserved or improved. Using confocal Raman microscopy, we were able to demonstrate the formation of a continuous FL- GNP tribo-film, already at 5wt% FL-GNP content.
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