METHOD FOR PRODUCING HEAT-RESISTANT COATING ON TITANIUM PLATE SURFACES 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 used in the manufacture of parts for energy and chemical plants that have increased heat resistance. A method for obtaining a heat-resistant coating on the surfaces of a titanium plate includes preparing a three-layer package with a symmetrical arrangement of the clad titanium plate relative to identical cladding metal layers in the form of plates 0.8-1 mm thick, placing protective layers on the surfaces of the cladding plates with identical explosive charges, and performing explosion welding the resulting assembly by simultaneous detonation of explosive charges, hot rolling of the welded workpiece and heat treatment. A three-layer package is made up of clad nichrome plates and a clad titanium plate 4-8 mm thick, explosion welding of the resulting assembly is carried out at a detonation speed of explosive charges of 2190-3060 m/s, while the height of the explosive charge, the material and thickness of the protective metal layers on the surfaces of clad nichrome plates, as well as welding gaps between the welded layers are selected from the condition of obtaining the collision speed of nichrome plates with a clad titanium plate in the range of 490-570 m/s, hot rolling of the resulting three-layer workpiece is carried out at a temperature of 590-610°C with compression to a thickness of each nichrome layer equal to 0.4-0.5 mm. Then the nichrome layers of the rolled three-layer workpiece are aluminized in molten aluminum at a temperature of 720-760°C for 1.2-6 minutes, after which the resulting workpiece is heat treated 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.

4 cl, 2 tbl, 3 ex