A technology is proposed for creating heat-protective wear-resistant coatings on the sur-face of CPG parts made of AK12MMgN alloy using galvanoplasma modification of microarc oxidation. For this purpose, a complete three-factor experiment of type 23 was carried out in the form of semi-replicas of coating deposition. The dependences of the thickness, microhardness, wear resistance and porosity of the galvanoplasma coating on the technological parameters of the process have been established. This technology appears to be effective as it reduces fuel consumption by 5-7 % and increases engine power by 8 % while ensuring optimal properties of the heat-shielding layer.
The task of increasing in the efficiency (lowering of fuel consumption) of diesel engines is considered.
The distribution of temperatures and stresses on the surface of oxide-coated piston coated by galvanic plasma
modification is analized. The basic equations are obtained using the finite element method and solved using the
ANSYS Workbench 18.1 and Solidworks 17. It is found thatthe surface temperature increases with increasing
of coating thickness due to decrease in thermal outflow. The increase in maximum temperature relative to
the uncoated piston is 64.3 % for 0.13 mm thickness coating. The temperature curves obtained for different
thicknesses of the bottom are similar to each other and approximately equidistant.
The numerical modeling showed that higher temperature in the combustion chamber is provided by thermal
barrier coatings, which increases the efficiency of the engine. Lowering the surface temperature of the piston
(substrate) creates favorable conditions for the piston to work.
The effect of the sandblasting pressure and the volume of alumina on the roughness of the substrate made of the AK12MMgN alloy, on the roughness of the deposited galvanic-plasma modification (GPM) coatings after blast cleaning, and on the adhesion strength of these coatings is investigate. It has been established that the proposed technology of surface treatment of cylinder-piston group (CPG) parts made of AK12MMgN alloy both before the application of GMG coatings and after their application to the above alloy makes it possible to obtain a heat-shielding layer, leading to significant fuel savings in diesel internal combustion engines. This method of treating the surfaces of the parts of a diesel engine CPG before and after applying heat-protective and wear-resistant coatings, confirmed by full-scale and bench tests, seems to be effective.
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