Investigation of energy losses of the internal combustion engine taking into account the correlation of the hydrophobic and hydrophilic

Currently, numerous methods are introduced to reduce the loss of mechanical energy of the engine using various materials for anti-wear coatings. The paper presents the results of measurements of the motor torque for 18 multilayer AlN/CrN (20-30N2) and CrN/AlN (20-30N2) coatings. The coatings were applied in an Ar/N2 plasma environment with a variable N2 flow rate by reactive magnetron sputtering. The results were compiled for two oil temperatures, 80 and 100 degrees C, in the engine speed range from 800 to 4000 rpm. The test results show that highly hydrophilic coatings reduce the loss of mechanical energy of the engine in the lower engine speed range and in the oil environment with a high 4% soot content. Highly hydrophobic coatings enable the reduction of torque and resistance to movement of the engine for higher speed ranges, above 2000 rpm. This work is the first work that indicates the need to take into account hydrophilic and hydrophobic properties coatings in determining engine energy losses. The influence of these properties is much greater than the surface texture of the coatings, hardness, Young's modulus and other parameters of the coatings. It is a new look at the issue of reducing friction losses in the engine.

Automated summary

This paper presents the results of measurements of motor torque for 18 multilayer AlN/CrN and CrN/AlN coatings. It shows that highly hydrophilic coatings can reduce the loss of mechanical energy in the lower engine speed range and in the oil environment with a high soot content, while highly hydrophobic coatings enable the reduction of torque and resistance to movement in higher speed ranges. The influence of these properties is more significant than the surface texture, hardness, Young's modulus, and other parameters of the coatings.