METHOD FOR PRODUCING HEAT-RESISTANT COATING Russian patent published in 2023 - IPC C23C26/02 C23C28/02 B23K20/08 B32B15/01 

FIELD: metal coating.

SUBSTANCE: method for producing a two-layer heat-resistant coating on the surface of a copper plate using the energy of explosives used in the manufacture of parts for power and chemical plants. A package of metal plates is made using a clad copper plate with a thickness of 4-8 mm and a clad nichrome plate with a thickness of 0.8-1 mm. A protective layer with an explosive charge is placed over the package and explosion welding is carried out at a detonation speed of the explosive charge of 1900-2930 m/s to obtain a bimetallic workpiece. The height of the explosive charge, the material and thickness of the protective layer, as well as the welding gap between the welded plates are selected from the condition of obtaining a collision speed of 320-430 m/s. The resulting bimetallic workpiece is cold rolled, ensuring compression of the nichrome layer to a thickness of 0.4-0.5 mm. The surface of the nichrome layer is aluminized in molten aluminum at a temperature of 720-760°C for 1.2-6 minutes, and then heat treatment of the resulting workpiece is carried out at a temperature of 850-900° C for 15-20 hours.

EFFECT: obtaining a coating with increased heat resistance in oxidizing gas environments and increased resistance to brittle fracture under thermal cycling and dynamic loads, capable of long-term resistance to gas corrosion even in the event of damage to the outer layer of the coating.

4 cl, 2 tbl, 3 ex