METHOD OF MULTICOMPONENT DIFFUSION SATURATION OF SURFACES OF PARTS FROM REFRACTORY NICKEL ALLOYS Russian patent published in 2019 - IPC C23C10/14 

FIELD: technological processes.

SUBSTANCE: invention relates to a method for multicomponent diffusion saturation of the surface of parts from refractory nickel alloys and can be used in power and / or aircraft engine building or other branches of the national economy. Multicomponent diffusion saturation is carried out in a gas circulation plant containing a reactor consisting of a muffle mounted on a cover frame with a fan and introduced into the said cover of the vacuum pump, and an electric furnace installed on said frame over the reactor. Cassettes with parts, cassettes with sources of diffusing elements and source of source gas halide medium are installed on said cover. Then, muffle is lowered onto said cover and electric furnace is installed on reactor, air is pumped from reactor with provision of vacuum of 10^-2–5×10^-2 mm Hg and electric furnace is heated. At reactor temperature of 600–950 °C vacuum pump is switched off at reactor temperature of 600–900 °C includes a fan, at temperature of 1,000–1,050 °C is held for 2–8 hours, at temperature 800–1,050 °C includes vacuum pump for removal of residual products of chemical reactions, which take place in reactor during diffusion saturation, at temperature 500–700 °C the fan is switched off. At temperature 100–120 °C electric furnace is removed, then muffle, cassettes with parts and cassettes with source of diffusing elements and source of source gas halide medium. Source of the diffusing elements used is chromium granules, chromium alloy alloys with aluminum, nickel and yttrium alloy granules, and anhydrous nickel chloride is used as source of the initial gas halide medium.

EFFECT: improved production of coatings with stable thickness and chemical composition and increased durability, improved properties of parts by heat resistance and heat resistance with such coatings.

1 cl, 12 tbl, 13 dwg