Powder injection moulding and sintering were used to obtain iron-based self-lubricating composites in which SiC particles were used as precursors to generate graphite nodules dispersed in the composite matrix. Using thermodynamic simulations with DICTRA®, it was possible to predict the SiC dissociation in the ferrous matrix studied (Fe+0.6C). The evolution of the dissociation of SiC particles during sintering was investigated by X-ray diffraction (XRD) and dilatometric analysis, whereas the structure and morphology of the graphite nodules were studied by field emission gun-scanning electron microscopy (FEG-SEM), micro-Raman spectroscopy, and transmission electron microscopy (TEM). To compare the characteristics of the graphite nodules, micro-Raman and tribological analyses (friction coefficient and wear rate) were carried out for nodular cast iron and graphite powder. Reductions in the friction coefficient and wear rate of the tribological pair can be associated with the turbostratic characteristics of the graphite nodules.

中文翻译：

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原位生成二维乱层石墨球的结构与性能

采用粉末注射成型和烧结获得铁基自润滑复合材料，其中以 SiC 颗粒为前驱体，生成分散在复合材料基体中的石墨球。使用 DICTRA® 的热力学模拟，可以预测所研究的铁基体 (Fe+0.6C) 中的 SiC 解离。通过 X 射线衍射 (XRD) 和膨胀分析研究了 SiC 颗粒在烧结过程中解离的演变，而通过场发射枪扫描电子显微镜 (FEG-SEM)、显微-拉曼光谱和透射电子显微镜 (TEM)。为了比较石墨球的特性，对球墨铸铁和石墨粉进行了显微拉曼和摩擦学分析（摩擦系数和磨损率）。摩擦副的摩擦系数和磨损率的降低可能与石墨球的湍流特性有关。