METHOD FOR PRODUCING HEAT-RESISTANT COATING ON SURFACE OF HEAT-RESISTANT STEEL PLATE Russian patent published in 2023 - IPC B23K20/08 B32B15/01 

FIELD: metal coating.

SUBSTANCE: method for producing coatings on metals using the energy of explosives. A method for producing a heat-resistant coating on the surface of a heat-resistant steel plate includes making a package of metal plates, placing a protective layer with an explosive charge over it, performing explosion welding, rolling the welded plates, explosion welding of the rolled workpiece with a heat-resistant steel plate and heat treatment. Make up a three-layer package 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 2-3 mm thick, the plates of the package are welded by explosion at a detonation speed of the explosive charge of 1850-2540 m/s. 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 plates being welded 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 workpiece is cold rolled, ensuring compression of the nichrome layer to a thickness of 0.4-0.5 mm. A package for explosion welding is made from a rolled three-layer workpiece and a plate of heat-resistant steel with a thickness of at least 2 mm, and they are welded by explosion at a detonation speed of the explosive charge of 2320-2730 m/s. The height of the explosive charge, the material and thickness of the protective layer on the surface of the nichrome layer of the metal rolled three-layer workpiece, as well as the welding gap between the welded layers are selected from the condition of obtaining a speed of their collision of 510-575 m/s, then the nichrome layer of the resulting four-layer workpiece is aluminized in a molten aluminum at a temperature of 720-760°C for 1.2-6 minutes. Heat treatment of the resulting workpiece is carried out at a temperature of 850-900°C for 15-20 hours.

EFFECT: coating is characterized by increased heat resistance in oxidizing gas environments and increased resistance to brittle fracture under thermal cycling and dynamic loads.

6 cl, 1 tbl, 3 ex