عنوان مقاله [English]
Nowadays, engine oils have various functions, which one of the most important of them is the lubrication of different parts in the engine, for reducing the rate of the friction and the wear. Oil properties are mainly a result of additives, which are added to the oil to improve requirement properties. Recently, nano-particles are also appeared as a new kind of additives, due to their special properties.The purpose of the present research is surveying the amount of the ability of nano-particles and it is a kind of the functionality to improve anti-wear properties and the heat-conduction ability and controlling developed variations of the engine oil, on its properties including: the viscosity, the pour point and the flash point. For this purpose, carbon nano ball particles, by using the planetary ball mill, were dispersed inside the Behran Pishtaz engine oil, SAE 20W50. Then, tests were done for investigating mentioned properties. Obtained results showed that the thermal conductivity coefficient of the oil containing carbon nano ball particles with 0.1wt%, increased about 18 percent with respect to the base oil. Also, upon results of the four ball test, the amount of the wear, in the oil contains nano-particles reduced 5 percent with respect to the oil without nano-particles.