METHOD OF PRODUCING FUNCTIONAL COATING BASED ON ALUMINUM-CARBON NANOFIBRES Russian patent published in 2019 - IPC C23C4/12 C23C24/04 B82B3/00 

FIELD: manufacturing technology.

SUBSTANCE: invention relates to a method of producing composite material for making functional coatings from aluminum alloy and carbon nanofibre and can be used in aircraft, space, shipbuilding and other industries. Method of producing a composite coating based on aluminum and carbon involves feeding powder using two dispensers into a supersonic heated gas stream to form a heterophase stream and applying the powder composition onto the surface of the article. Into said supersonic flow from first dispenser is introduced powder Al₂O₃ for treatment of product to formation of juvenile surface, then powder composition is successively applied by method of cold gas-dynamic sputtering. For application of the first wear-resistant layer in the above supersonic flow from the second dosing unit there introduced is composite powder material containing carbon and aluminum, for application of the second binding layer – aluminum powder PA-4, for application of the third hardening layer – composite powder material containing carbon and aluminum, for application of the fourth binding layer – aluminum powder PA-4 and for application of the fifth wear-resistant layer – composite powder material containing carbon and aluminum. Content of carbon in first layer is 0.4–0.6 wt%, Al and unavoidable impurities – rest, content of carbon in the third layer makes 0.5–1 wt%, Al and inevitable impurities – balance, content of carbon in fifth layer makes 0.6–1.6 wt%, Al and unavoidable impurities – the rest, as carbon in composite powder material carbon nanofibre is used.

EFFECT: obtaining a composite material for a wear-resistant coating having a higher hardness of more than 1,9 GPa, low friction coefficient to 0,4, high resistance to breakage during operation with simultaneous preservation of low wear, required strength and impact viscosity.

5 cl, 7 tbl, 3 ex