A. A. Kopylov

Multicomponent Heat-Resistant Coatings for Blades Produced Using Ion-Plasma Method

It is shown that the ion-plasma method can be combined with the diffusion methods for the formation of complex heat- and corrosion-resistant coatings on blades of ЖC6У alloy. The complex method enables one to apply metal layers, for example, Ni–Cr–Zr, and to produce surface ceramic film based on fcc ZrO2. A version of the coating satisfied the imitative tests and, as a part of an article, the pilot-industrial tests.

Use of Low-Active Circulating-Gas Aluminizing for Repairing the Nozzle-Set Containers of a Turbine

The cause of damage in internal and external containers of the nozzle set of the first stage of the TV3-117 engine is shown to be the intercrystallite gas corrosion of the materials of which they are produced (alloy KhN38VT and steel 12Kh18N10T, respectively). It is shown that low-active circulating-gas aluminizing can be used for repairing the parts, increasing their high-temperature strength, and “curing” micro- and macrocracks.

Ti-N vacuum-plasma coatings for turbine compressor blades

Ti-N three-layer vacuum-plasma coatings 50–60-μm thick deposited on VT3- and OT4-alloy turbine compressor blades by a high-energy technology were studied. The gas-abrasive wear resistance of the coatings on VT3 alloy was superior to those on OT4 alloy at 20°C, but inferior at 250°C. The coatings were not susceptible to climatic corrosion. Their cycle-temperature stability were higher on OT4 alloy.

Vibration-gas-abrasive wear resistance of turbine compressor blades

The scheme of gas-abrasive wear test of turbine compressor blades under free vibration of blades, including at high temperatures, is proposed. The amplitude- and time-dependences of the wear rate of εν961-steel and BT8-alloy blades, having either with or without a (Ti,Zr)N coating, were compared. The coatings effectiveness is almost the same for both cases at 20°C, but at 150°C, it is lower for steel blades because of spalling the coating due to its deficient adhesion.

Certain peculiarities of Zr−Cr−N coatings on steel blades of a gas-turbine engine compressor

The properties of compressor blades of a helicopter gas-turbine engine with an experimental ionplasma coating Zr−Cr−N, are compared to those with Ti−Zr−N basic composition. It is shown that, due to the structural properties, the experimental coatings make the blades more corrosion-resistant, and mitigate the dependence of their residual properties on the amplitude and the temperature of the preliminary vibrotempering.

Properties of diffusion alumino-zirconium coatings with microadditions

In the development of materials resistant to gas corrosion at high temperatures interest has been traditionally directed towards aluminum-containing coatings on a metallic substrate, with inert oxide films on the surface. Oxide layers based on cubic, tetragonal, or mono-clinic ZrO{sub 2} are examples of the latter. The methods of production include various processes for saturating the surface of a part with aluminum and zirconium (and possibly other elements) deposited simultaneously, or in sequence. In this work, specimens of nickel base coatings were used as substrates on which layers of diffusion coatings were deposited. 6 refs., 3 figs.