Study on application of MoDTC in lubricating oil

2019-01-16 10:54:54

It has been reported by research data that in terms of friction loss alone, about 20% ~ 25% of the energy released by fuel combustion is consumed by the friction between parts under the working condition of the engine.Therefore, by improving the lubrication between the friction parts of the engine and reducing the energy loss caused by friction, it has a direct impact on improving the fuel economy of the automobile.In comparison, improving fuel economy by improving lubricating oil formula has more cost advantages.


When the engine is working, the bearing parts are mainly in the state of elastohydrodynamic lubrication, while the valve system, piston and cylinder liner parts are mainly in the state of boundary lubrication and mixed lubrication.For fluid lubrication, low viscosity lubricating oil can reduce friction resistance.For boundary lubrication and mixed lubrication, it is more effective to add effective friction improver in lubricating oil.Therefore, it is necessary to investigate and study the effect of friction modifier on the friction reduction of gasoline engine oil, so as to obtain oil with lower friction coefficient.

Through the actual test of torque test of the generator, the fuel economy of the oil with MoDTC is better than that without MoDTC, and the fuel economy of the oil with high molybdenum content (850ppm) is more advantageous.

 

This work focuses on the tribochemistry of metal dithiocarbamate (MoDTC) oil additive to boost friction behavior of diamond-like-carbon (DLC) coated systems lubricated in boundary regime. Raman research has been accustomed investigate surface tribolayers shaped on coated (hydrogenated a-C:H and non-hydrogenated ta-C) and steel surfaces once lubricated with model lubricants and business engine oils. The result of the additive package and therefore the variety of DLC contend an important role within the development and composition of the tribolayer and therefore the friction performance. The additive package contained within the totally developed (FF) oils restricted the friction reduction capabilities of MoDTC additive for each material try. Accelerated a-C:H coating wear associated with MoDTC tribochemistry was found. For the primary time, it's been shown that a particular MoS2-containing tribolayer will be shaped on the ta-C surface, resulting in a constant of friction less than zero.04. The underlying mechanisms of MoDTC/surface interactions and their result on friction and wear area unit mentioned.


Diamond-Like Carbon (DLC) coatings area unit accepted for giving glorious tribological properties. they need been shown to supply low friction and outstanding wear performance in each dry and lubricated conditions. Application of those coatings for automotive parts is taken into account as a promising strategy to deal with the rising needsconcerning fuel economy and sturdiness. Commercially out there oils area unit usually optimised to figure on standard ferric surfaces and don't seem to be essentially effective in lubricating non-ferrous surfaces. Recently, the adverse result of the metal DialkyldithioCarbamate (MoDTC) friction modifier additive on the damage performance of the alter DLC has been reported . However, the mechanisms by that MoDTC imposes this high wear to DLC don't seem to be nonetheless well understood. higher|a far better|a much better|a higher|a stronger|a more robust|an improved} understanding of DLC wear might doubtless result in better compatibility between DLC surfaces and current additive technology being achieved.






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