Abstract
This chapter deals with the mechanisms of high-temperature oxidation and sulfur oxide corrosion of vacuum plasma coating of Me–Cr–Al–Y type on heat-resistant nickel-based alloys. The increase of both power and efficiency of gas turbines is closely related to the increase of operating temperatures and aggressiveness of the environment, which results in stricter requirements on the high-temperature construction materials. Most modern heat-resistant materials based on iron, nickel, and cobalt have almost exhausted their heat-resisting capabilities. The chapter illustrates that vacuum plasma coatings can be used for the protection of GTE blades, if all procedures for coating deposition are carried out exactly and correct thermal treatment is applied. The optimal structural model for a Co–Cr–A1–Y VPS coating, obtained after thermal treatment, has been proposed. Because diffusion of Co is completely absent in the substrate, vacuum plasma coatings of the Co–Cr–A1–Y type deposited onto heat-resistant Ni-based alloys with well-formed structure do not worsen the mechanical properties of those alloys.
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