METHOD OF LASER OVERLAYING OF METAL COATINGS Russian patent published in 2020 - IPC B23K26/352 B23K35/36 C23C24/08 B82Y40/00 B82B3/00 

FIELD: technological processes.

SUBSTANCE: invention relates to a method of laser deposition of metal coatings and can be used in formation of protective slurry coatings on structural materials. Prepreg based on a polyamide fabric impregnated with a caking polymer composition is applied on the metal surface. Tissue is decomposed to form active nitrogen and is converted into a single macromolecule containing simultaneously boron, titanium and nitrogen atoms in stoichiometric ratio and a catalyst when forming nitrides – a carbon atom. Prepreg under decomposition of temperature generated by laser beam destructs, releasing highly active atoms of boron, titanium, nitrogen and carbon, which react in a medium of porous coke, forming a mixture of titanium and boron nitride with impurities of heat-resistant carbides similar in melting point. Temperature is then increased to 16,000÷1,800 °C. At that, coke and impurities are destructed, and on surface of iron-carbon alloy there is a lighter layer of solid particles, melting point of which is close to 3,000 °C. Thickness of the protective layer is adjusted by the number of prepreg layers. Application of the composition onto the polyamide fabric is controlled by the viscosity of its solution and the speed of drawing the fabric on the impregnating machine.

EFFECT: technical result of the invention consists in improvement of antifriction properties of iron-carbon alloys under conditions of action of high and ultrahigh temperatures due to formation on the surface of alloys of a layer from a mixture of nitrides of boron and titanium of the specified adjustable thickness.

1 cl, 3 ex