METHOD FOR CHEMICAL HEAT TREATMENT OF PARTS MADE FROM COBALT-BASED ALLOY Russian patent published in 2016 - IPC C23C8/02 C23C8/36 C23C14/48 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, in particular, to methods for chemical heat treatment of parts made from cobalt-based alloy, and can be used for production of parts and assemblies of gas turbine hot section of aircraft engines, stationary gas-turbine plants and other articles, operating at high temperatures. Method for chemical heat treatment of parts made from cobalt-based alloy comprises placing a part in a working chamber, activation of surface of part before chemical heat treatment, feed a working saturating medium into chamber, heating to temperature of chemical heat treatment and holding at said temperatures to form required thickness of diffusion layer. Activation of surface of part before chemical heat treatment is carried out by means of ion-implantation treatment of surface of part at ion power from 35 to 50 keV, radiation dose of 1.2·10¹⁷ cm^-2 to 1.6·10¹⁷ cm^-2, radiation dose accumulation speed of 0.6·10¹⁵ s^-1 to 0.9·10¹⁵ s^-1 and when using as implanted ions, ions of following elements: C, N, Cr, Y, Yb or their combination. In particular cases, chemical heat treatment of part is performed by ion-plasma nitriding or ion-plasma cementation or ion-plasma carbonitriding.

EFFECT: higher efficiency and quality of chemical heat treatment, higher wear resistance of parts after chemical-thermal treatment.

3 cl, 1 ex