Patent ID: 8708659

Claim:
A turbine engine apparatus comprising: a rotor disk made of a superalloy material; and a protective coating disposed on the rotor disk, the protective coating having a composition in accordance with the composition of the superalloy material of the rotor disk such that fatigue of the rotor disk is not debited, the composition of the protective coating consisting essentially of up to 30 wt % cobalt, 5-40 wt % chromium, 4.0-35 wt % aluminum, up to 6 wt % tantalum, up to 1.7 wt % molybdenum, up to 3 wt % rhenium, up to 5 wt % tungsten, up to 2 wt % yttrium, up to 2 wt % hafnium, 0.05-7 wt % silicon, 0.01-0.2 wt % zirconium, and a balance of nickel.