METHOD OF COATING APPLICATION FOR HEAT PROTECTION OF PARTS MADE OF NIOBIUM-BASE ALLOYS Russian patent published in 2017 - IPC C23C10/44 C23C14/16 

FIELD: metallurgy.

SUBSTANCE: invention refers to coatings for metal materials and can be applied for protection of parts made of niobium alloys against high-temperature gas corrosion at high temperatures. Condensed layer of MeCrAlY system alloy is formed on the surface of parts, where Me is iron, nickel, cobalt, and diffusion saturation of the condensed layer surface with silicon is performed. Before obtainment of condensed layer out of the said alloy, the part surface undergoes diffusion saturation with silicon up to specific weight gain of 40-80 g/m², so that specific weight gain ratio after diffusion saturation of the condensed alloy layer with silicon and after diffusion saturation of the part surface with silicon comprises 0.1-1.5 g/g. In particular cases of invention application, diffusion saturation of the part surface and condensed layer of MeCrAlY system alloy with silicon, where Me is iron, nickel, cobalt, is followed by vacuum heat treatment at 1100-1300 °C for 1-5 hours.

EFFECT: improved high-temperature stability of protective silicide coatings of niobium alloy products.

2 cl, 1 tbl, 2 dwg