METHOD FOR PRODUCING HEAT-RESISTANT COATING ON THE 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 surfaces 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 metal plate and heat treatment. They make up two three-layer packages with a copper plate 1-2 mm thick placed in each of them between the top nichrome plate 0.8-1 mm thick and the bottom plate of austenitic steel 2-3 mm thick, the plates of each package are welded by explosion at the detonation speed of the explosive charge substances 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 and the welding gaps between the welded plates in each package are selected from the condition of obtaining the collision speed of the nichrome plate with the copper plate 390-450 m/s, the copper plate with the steel plate 350-415 m/s . Then the resulting three-layer workpieces are cold rolled, ensuring that the nichrome layer in each of them is compressed to a thickness of 0.4-0.5 mm. Next, they make up a package for explosion welding from two identical rolled three-layer workpieces with a symmetrical arrangement between them of a clad plate of heat-resistant steel with a thickness of at least 2 mm, explosion weld of the steel layers of three-layer workpieces with a plate of heat-resistant steel at a detonation speed of two identical explosive charges of 2320-2730 m/s. The height of each explosive charge, the material and thickness of the protective layers on the surfaces of the nichrome layers of the rolled three-layer workpieces, as well as the welding gaps between the welded layers are selected from the condition of obtaining the collision speed with a heat-resistant steel plate equal to 510-575 m/s. Then the nichrome layers are aluminized in molten aluminum at a temperature of 720-760°C for 1.2-6 minutes. Heat treatment is carried out at a temperature of 850-900°C for 15-20 hours.

EFFECT: coatings have 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