METHOD OF ALUMINIDE COATING RECEIVING AT SURFACE OF PRODUCT MADE OF HEAT-RESISTANCE ALLOY Russian patent published in 2009 - IPC C23C14/38 C22C21/04 C22C21/00 

FIELD: metallurgy.

SUBSTANCE: invention concerns metallurgy and can be used in aircraft and power turbine construction for protection of turbine blades against high-temperature oxidation and sulphide corrosion. Product and alloy on the basis of aluminium are located in treatment area. In the treatment area it is created vacuum, it is supplied negative potential to product and separately to alloy on the basis of aluminium. It is implemented forced cooling of alloy. It is strike on it vacuum arc, burning in steams of this alloy with formation of plasma alloy on the basis of aluminium. It is implemented bombardment of product surface by plasma ions of alloy on the basis of aluminium for cleaning and heating of product surface. Diffusion and collection of this alloy on the surface of product is implemented with specific additional weight (20-140) g/m² at negative potential on product, chosen in limits from floating potential till - 50 V. Then it is implemented cooling of product in vacuum. Product heating in vacuum for forming of diffusion aluminide coating is implemented out of its treatment area. Then it is implemented final polishing of product surface of diffusion aluminide coating. In the capacity of alloy on the basis of aluminium it is used alloy containing two or more alloying elements from row: silicon, yttrium, boron, nickel, cobalt, chrome. Alloy on the basis of aluminium before location into treatment area is soldered to water-cooled mandrel.

EFFECT: increasing of quality of aluminide coating at the expense of reduction of micro-dripping phase part in plasma stream of alloy on the basis of aluminium and at the expense of increasing of cyclical high-temperature strength, heat resistance and durability of coating.

11 cl, 1 tbl, 6 ex