CATALYTICALLY ACTIVE THERMAL BARRIER CERAMIC MODIFICATION LAYER ON THE SURFACE OF THE BOTTOM OF THE PISTON, AND/OR SPHERE, AND/OR EXHAUST CHANNELS OF THE INTERNAL COMBUSTION ENGINE HEAD AND THE METHOD FOR ITS FORMATION Russian patent published in 2021 - IPC B01J21/04 B01J23/10 C25D11/06 F02B77/02 F02B77/11 

FIELD: protective coatings.

SUBSTANCE: invention relates to catalytically active ceramic coatings that can be used in internal combustion engines (ICE). The essence of the invention consists in the formation, by microarc oxidation (MAO), of a catalytically active thermal barrier ceramic modification amorphous layer, which includes an oxide catalyst, namely cerium oxide, 100-200 microns thick, which consists of an oxide part of a layer 20-40 microns thick, on the surface of which the outer part of a layer 80-160 microns thick with an amorphous structure is formed. The method for forming a catalytically active thermal barrier ceramic modification layer is carried out by the MAO method in the cathode-anode mode on a sinusoidal current, consisting in the formation of a high-temperature phase with high hardness of the oxide part of the layer with a thickness of 20-40 microns, which grows inside an aluminum alloy, on the surface of which the outer part of the layer with a thickness of 80-160 microns with an amorphous structure is formed. As an electrolyte, a solution of liquid glass and alkali is used with the addition of a suspension of dispersed cerium oxide. The oxide catalyst is included in the electrolyte and is used as an element of the microarc oxidation process.

EFFECT: catalytically active layer has a high adhesive strength, resistance to thermal shock and thermal cycling, a higher thermal barrier and catalytic effect and a thermal conductivity coefficient of 1-3 W/m∙K not only on the bottom of the piston and the sphere of the head, but also the exhaust ducts of the cylinder head.

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