METHOD OF SURFACE CALORISING OF INTERNAL CAVITY OF TURBINE BLADE FROM HEAT-RESISTANT ALLOY Russian patent published in 2010 - IPC C23C10/48 B05D7/22 

FIELD: metallurgy.

SUBSTANCE: invention relates to method of receiving of aluminide coatings and can be used in aviation and energy turbine manufacture. Method of surface calorising of internal cavity of turbine blade from heat-resistant alloy, containing entrance channels, output slit and/or punched hole, includes preparation of powder mixture, filling of internal cavity of blade by powder mixture through entrance channels, heating of blade with powder mixture, saturation of surface of internal cavity of blade by aluminium and removing of powder mixture from internal cavity of blade. Before filling of internal cavity of blade by powder mixture output slit and/or punched hole, and entrance channels after filling by powder mixture is closed by plastic metal foil. Saturation of surface of internal cavity of blade is implemented at temperature 560-640°C no longer than 8 h. After removing of powder mixture from internal cavity of blade it is implemented heat treatment of blade in vacuum. Powder mixture contains components in a following ratio, wt %: aluminium 10-30, aluminium oxide 67-89 and activating agent NH₄CI 1-3. Maximum lateral dimension of particles in powder mixture d_p is selected from condition d_p≤d_mh/3, where d_mh minimal lateral dimension of output slit on blade and/or punched holes, and in the capacity of plastic metal foil it is used foil from aluminium or nickel.

EFFECT: receiving of coating, providing overall protection of surfaces of internal cavities of blades from heat-resistant alloys.

5 cl, 1 tbl, 1 ex