Research Status of Synergistic Effect of Metal-doped DLC Film and LubricatingOil Additives
LIU Kang1, KANG Jiajie1,2, YUE Wen1,2, FU Zhiqiang1,2, ZHU Lina1,2,SHE Dingshun1,2
1 School of Engineering and Technology, China University of Geosciences (Beijing),Beijing 100083; 2 National International Joint Research Center of Deep Geodrilling Equipment,Beijing 100083
Abstract: DLC film has a good application prospect in the field of mechanical anti-friction and wear resistance due to its excellent tribological perfor-mance. Deposited on the surface of key components of the automobile engine, DLC film can play a good role in anti-friction and wear resis-tance, thereby improving fuel utilization, saving energy and reducing pollution and protecting the environment. By doping the metal into the DLC film, the friction coefficient under oil lubrication and boundary lubrication conditions can be further reduced and the wear resistance and service stability of the DLC film can be improved, due to the frictional chemical reaction between the metal and the lubricating oil medium. However, due to the different physical and chemical properties of various doped metals, the tribological properties are also different under the same lubrication environment. Different lubricating oil additives have different tribochemical reactions with metal-doped DLC, as well as the friction-reducing mechanism, reaction products and decomposition products, due to the difference of their main components. The two most commonly used lubricating oil additives are the anti-wear antioxidant zinc dialkyl dithiophosphate (ZDDP) and the friction modifier molybdenum dialkyldithiocarbamate (MoDTC). ZDDP is known for its excellent wear resistance, while MoDTC has excellent anti-friction properties. Given the obvious effects and wide range of use of the two additives. The tribological behavior of them with metal-doped DLC film has also become the focus of researches. For doped metal, tungsten can form WS2 compounds with good lubricity. The incorporation of titanium into DLC can comprehensively improve the mechanical tribological properties and surface activity of DLC films, thus engaging attention of the researchers. MoDTC reduces the friction coefficient but shows no improvement in the wear resistance of metal-doped DLC film. This is because MoDTC forms decomposition products MoS2 and MoO3, the former of which forms a friction-reducing reaction film while the latter causes abrasive wear. ZDDP often has no influence on the friction coefficient but reduces the wear rate to some extent, which is related to the formation of a matte phosphate reaction film. In addition, nano-additives are of great significance in the industrial field due to their unique self-repairing properties. Nano-copper particles help to increase the anti-wear properties of metal-doped DLC and achieve a relatively stable friction coefficient. For doped metals, titanium can promote the decomposition of MoDTC, comprehensively improving the anti-friction and wear resistance of the film, while the compounding with the extreme pressure additive will lead to the deterioration of the surface morphology of DLC and increase the friction coefficient. The combination of tungsten and ZDDP may inhibit the formation of phosphoric acid film and reduce the anti-wear effect, while the increase of tungsten content causes MoDTC to generate more MoS2, which helps to improve tribological properties. The researches on the synergistic effect of metal-doped DLC and lubricant additives worldwide were reviewed in this article. The effects of diffe-rent additives and different doping metals on the tribological properties of DLC films were summarized. Problems in existing researches were analyzed and prospects were pointed out. The research was expected to provide a reference for selecting the combination of metal-doped DLC tribo-pair and additive that has great tribilogical properties.
刘康, 康嘉杰, 岳文, 付志强, 朱丽娜, 佘丁顺. 金属掺杂DLC薄膜与润滑油添加剂协同作用的研究现状[J]. 材料导报, 2019, 33(19): 3251-3256.
LIU Kang, KANG Jiajie, YUE Wen, FU Zhiqiang, ZHU Lina,SHE Dingshun. Research Status of Synergistic Effect of Metal-doped DLC Film and LubricatingOil Additives. Materials Reports, 2019, 33(19): 3251-3256.
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2019, Vol. 33 
