This study analysed and discussed the friction and wear properties, as well as the interface evolution behaviour of polycrystalline diamond compact (PDC) under various base oils, through conducting friction experiments on PDC/Si₃N₄ with different base oils. The friction and lubrication mechanism of PDC under different base oils were examined using scanning electron microscopy (SEM), x-ray energy dispersive spectrometry (EDS), three-dimensional white light interferometry, and Raman spectroscopy. The results of the study demonstrated that PDC exhibited the best friction and wear performance when lubricated with synthetic oil PAO, followed by castor oil. The inferior performance of paraffin oil can be attributed to its low viscosity, resulting in a lower presence of ions capable of passivating the carbon dangling bond. Consequently, paraffin oil displayed inadequate oxidation stability and increased susceptibility to oil film destruction, ultimately leading to suboptimal friction and wear characteristics. Overall, this study provides valuable insights for industrial applications, aiding in the selection of appropriate base oils as cutting fluids for PDC cutting tools and enhancing the friction and wear properties of PDC.

中文翻译：

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不同基础油对聚晶金刚石复合片摩擦行为的影响

_{本研究通过对PDC/Si 3} N ₄与不同基础油的摩擦实验，分析讨论了聚晶金刚石复合片（PDC）在不同基础油下的摩擦磨损性能以及界面演化行为。利用扫描电子显微镜（SEM）、X射线能谱仪（EDS）、三维白光干涉仪和拉曼光谱研究了PDC在不同基础油下的摩擦和润滑机理。研究结果表明，使用合成油 PAO 润滑时，PDC 表现出最佳的摩擦磨损性能，其次是蓖麻油。石蜡油的较差性能可归因于其低粘度，导致能够钝化碳悬键的离子较少。因此，石蜡油的氧化稳定性不足，并且对油膜破坏的敏感性增加，最终导致摩擦和磨损特性不理想。总体而言，这项研究为工业应用提供了宝贵的见解，有助于选择合适的基础油作为 PDC 切削刀具的切削液，并增强 PDC 的摩擦和磨损性能。