FABRICATION OF REFRACTORY NANOCOMPOSITE COATING OF SURFACE OF REFRACTORY NICKEL ALLOYS Russian patent published in 2015 - IPC C23C14/06 B82B3/00 C23C14/02 C23C14/48 C23C14/35 

FIELD: process engineering.

SUBSTANCE: invention relates to machine building, particularly, to making of protective coating on parts subjected to high temperatures and mechanical stresses. Proposed method comprises cleaning of parts and vacuum chamber in glow discharge in inert gas atmosphere, ionic etching and coat application by deposition from vapour phase. Note here that prior to coat application the ion-plasma cementation is executed along with ionic etching. This is performed by feed of carbon-containing gas into the chamber and part heating with the help of two magnetrons operated in dual mode. Cementation is alternated with ionic etching in N steps, where N ≥ 1, while application of coating is executed by sequential forming of consecutive alternating plies of at least one micro ply consisting of chromium and the alloy of aluminium with silicon of total depth of 1.9-2.8 mcm and at least one micro ply consisting of chromium, aluminium and silicon oxides of total depth of 0.4-1.6 mcm produced at oxygen feed into said chamber. Note here that said micro plies consist of nano plies of said materials of 1-100 nm depth composed at part feed by magnetrons with targets of chromium and alloy of aluminium with silicon.

EFFECT: longer life, higher heat resistance at high-temperature oxidation and erosion.

1 ex, 1 tbl