In situ nanocompression of carbon black to understand the tribology of contaminated diesel engine oils
In situ nanocompression of carbon black to understand the tribology of contaminated diesel engine oils
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DOI：
10.1016/j.carbon.2023.118170
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发表时间：
2023-06
期刊：
影响因子：
10.9
通讯作者：
A. Al Sheikh Omar;F. Salehi;M. Bai;B. Inkson;A. Morina
中科院分区：
文献类型：
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作者：
A. Al Sheikh Omar;F. Salehi;M. Bai;B. Inkson;A. Morina
该研究评估了炭黑（CB）替代的碳烟在影响发动机油性能方面的作用。众所周知，油中烟灰的存在会在接触表面上产生磨料磨损。其他机制影响油的性能，如添加剂的碳烟吸附和油的降解，由于与碳烟的相互作用。最近的研究表明，存在另一种与碳烟颗粒有关的磨损机制，但对此知之甚少。本研究探讨了碳烟在发动机油中的相互作用对其机械性能的影响。在实验中使用炭黑颗粒（CBPs）来模拟发动机中的真实的碳烟。利用透射电镜（TEM）和X射线衍射（XRD）分析了CBPs的微观结构和晶体结构，并与真实的炭黑进行了对比;利用扫描电镜（SEM）对不同粒径的CBPs进行了原位压缩，以评价其力学性能。结果表明，老化的CBPs比新鲜的CBPs明显更硬，表明在油中老化改变了CBPs的乱层晶体结构，并改变了其机械性能，潜在地影响摩擦学性能。
The study has evaluated the role of soot, surrogated by carbon black (CB) experimentally, in affecting the performance of engine oils. It is very well known that the existence of soot in oil produces abrasive wear on contact surfaces. Other mechanisms influence the oil performance such as additives adsorption on soot and oil degradation due to the interactions with soot. Recent research has suggested the existence of another wear mechanism related to soot particles, which remains poorly understood. This study investigates the effect of soot interactions in engine oil on its mechanical properties. Carbon black particles (CBPs) were used in the experiments to simulate real soot in the engine. The microstructure and crystal structure of CBPs compared to real soot were investigated using transmission electron microscopy (TEM) and X-ray diffraction (XRD).In situcompression of the single particle was conducted in a scanning electron microscope (SEM) to evaluate the mechanical properties of fresh and aged CBPs with different sizes. The results show that aged CBPs are significantly harder than fresh CBPs, indicating that ageing in oil modifies the turbostratic crystal structure of CBPs and alters its mechanical properties, potentially affecting tribological performance.