METHOD FOR APPLICATION OF WEAR-RESISTANT AND CORROSION-RESISTANT COATING OF POWDERED HARD ALLOYS Russian patent published in 2021 - IPC C23C24/08 B22F7/04 

FIELD: powder metallurgy.

SUBSTANCE: invention relates to powder metallurgy, in particular to the application of wear- and corrosion-resistant functional coatings of powdered hard alloys on the surface of parts. The application of the powder material is carried out in three stages. At the first stage, a corrosion-resistant diffusion nickel-copper coating is applied to the entire surface of the part at a temperature of 950-1050°C from a medium of low-melting liquid metal solutions containing, wt. %: lead 84.2-92.5, lithium 0.5-0.8, nickel 1-3, copper 6-12. At the second stage, a powder binder layer is applied, consisting of a mixture of components, wt. %: titanium carbide 40-60, copper 10-17, nickel 13-20, manganese 16,5-22,2, lithium 0,5-0,8. At the third stage, the main powder carbide layer, which is a chrome carbide hard alloy KHN-15, is applied to the binder layer. Then the layers are simultaneously pressed at a pressure of 20-30 MPa and heated in an inert medium, after which isothermal exposure is carried out at a temperature of 0.75-0.95 of the melting point of nickel until the powder carbide layer is completely sintered.

EFFECT: exclusion of porosity and cracking of the coating during mechanical operation and thermal cycling is ensured.

1 cl, 1 tbl, 4 ex