Abstract Tribological phenomena of DLC–steel tribo-systems in fully formulated oils were investigated using a Tribo-Raman-spacer layer imaging method (SLIM), which can evaluate the tribological behavior, tribofilm formation process, and tribofilm thickness on the sliding surface. In particular, the effects of the formation process of the tribofilm on the steel surface on the wear phenomena of the DLC were investigated using oil formulations with three different wear levels as test lubricants. The oils were labeled based on the wear results of an engine wear test conducted on the DLC coated-tappet at the DLC coated-tappet/steel-cam contacts. A friction test was conducted at the hydrogenated amorphous carbon DLC (a-C:H DLC) disk/steel ball contacts lubricated with the three formulated oils. The in-situ Raman-SLIM results revealed that thicker phosphate tribofilms with a large number of P–O–P bridges led to lower wear volume of DLC. In other words, the growth of the phosphate tribofilm is a key factor inhibiting the Mo-FMs-induced wear of DLC. Therefore, a booster that can contribute to the growth of the phosphate tribofilms on the steel surface is effective in inhibiting the wear of DLC under the lubrication with fully formulated oils.

中文翻译：

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Tribo-Raman-SLIM 观察用全配方油润滑的类金刚石碳，在 DLC/钢接触处具有不同的磨损水平

摘要 使用摩擦拉曼隔离层成像方法 (SLIM) 研究了全配方油中 DLC-钢摩擦系统的摩擦学现象，该方法可以评估滑动表面的摩擦学行为、摩擦膜形成过程和摩擦膜厚度。特别是，使用具有三种不同磨损水平的油配方作为测试润滑剂，研究了钢表面摩擦膜的形成过程对 DLC 磨损现象的影响。机油根据对 DLC 涂层挺杆在 DLC 涂层挺杆/钢凸轮触点处进行的发动机磨损测试的磨损结果进行标记。在用三种配方油润滑的氢化无定形碳 DLC (aC:H DLC) 圆盘/钢球触点上进行摩擦测试。原位拉曼-SLIM 结果表明，具有大量 P-O-P 桥的较厚磷酸盐摩擦膜导致 DLC 的磨损量较低。换句话说，磷酸盐摩擦膜的生长是抑制 Mo-FMs 诱导的 DLC 磨损的关键因素。因此，可以促进钢表面磷酸盐摩擦膜生长的助推剂可有效抑制全配方油润滑下 DLC 的磨损。