Patent ID: 7763356

Claim:
A coated article, comprising: a turbine engine component having at least one surface; said turbine engine component comprised of a molybdenum based refractory metal alloy or a niobium based refractory metal alloy; a bond coat layer disposed upon said at least one surface, said bond coat layer consisting of from 50 to 90 percent by weight of a molybdenum disilicide base compound, from 10 to 50 percent by weight of silicon nitride, and optionally at least one of the following: silicon carbide and tantalum oxide; and a functionally graded material layer disposed upon said bond coat layer, said functionally graded material layer comprising molybdenum disilicide, mullite and at least one of the following: silicon nitride, silicon carbide or tantalum oxide, said functionally graded material layer increasing in mullite composition from an interface with said bond coat layer so that said functionally graded material layer has 100% by weight mullite at an interface with a thermal barrier coating layer.