Comparison of High-Temperature Wear Resistance of Gas-Flame and Ion-Plasma Sealing Coatings with 0.1% Yttrium

Wear-resistant sealing coatings of KNA-82 system with 0.1% yttrium addition for hot parts of gas-turbine engines, applied by gas-flame and ion-plasma methods, are considered. The introduction of yttrium increases the operating temperature from 900°C to 1100°C. The methodology of modeling of processes of contact interaction of engine parts under operating conditions has been developed. Tribotechnical tests modeling the contact of the coating surface with the rotor ridge tops and blade feathers have been carried out, after which linear wear has been measured and the results have been statistically processed. The gas-flame coatings show slower wear reduction at temperatures up to 800°C, while both coatings show similar properties at 1100°C. The improved properties are attributed to the formation of phase-like Ni3Y compound in the grain boundaries.