GENERAL ELECTRIC COMPANY
NASA in interested in characterizing the ability of a recently developed protective coating for turbine engine components from the environmental damage, which accumulates throughout the life of turbine engines powering commercial aircraft. Higher operating temperatures of the new gas turbine engines coupled with aggressive environments have resulted in a new generation of disk alloys to be more susceptible to both hot corrosion and oxidation than their older, lower temperature counterparts. Hot corrosion is a form of an environmental attack which can occur at high temperatures and can significantly reduce the durability of engine components. A high chromium (Cr) content nickel coating developed by GE shows promise in protecting these critical components from environmental damage. While the initial results are promising, further work is needed to quantify the ability of this coating to protect these types of alloys under long term exposure conditions to which these components are subjected. The objective is to perform mechanical testing to determine the effect of environment and multiple high temperature exposures on the durability of baseline uncoated and coated test specimens. Various types of mechanical testing will be performed on coated and uncoated test specimens to quantify the benefits derived from using the newly developed coating. The anticipated temperature regime of interest is 1300°F (640°C) to 1400°F (704°C).