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 three-layer heat-resistant coating on the surface of an austenite steel plate using the energy of explosives used in the manufacture of parts for power and chemical plants. Make up a three-layer package of metal plates with a copper plate 1-2 mm thick placed between the upper nichrome plate 0.8-1 mm thick and the lower plate made of austenitic steel 2-6 mm thick. 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 1850-2540 m/s to obtain a bimetallic workpiece. The height of the explosive charge, the material and thickness of the protective layer on the surface of the nichrome plate, as well as the welding gaps between the welded plates are selected from the condition of obtaining the collision speed of the nichrome plate with copper 390-450 m/s, copper with steel plate 350-415 m/s. The resulting three-layer billet is cold rolled, ensuring compression of the nichrome layer to a thickness of 0.4-0.5 mm. The nichrome layer of the rolled three-layer workpiece is aluminized in molten aluminum at a temperature of 720-760°C for 1.2-6 minutes, and then heat treated 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.

5 cl, 1 tbl