Afterburner seals with heat rejection coats
A method for applying a coating system that is applied to a surface of a component for preventing or at least substantially preventing interdiffision between the component surface and a protective thermal layer applied to the component surface when the thermal layer is exposed to elevated temperatures. The method includes applying a carrier layer containing aluminum to the component surface. Next, the layer is heated to a first predetermined temperature for a first predetermined period of time in the substantial absence of oxygen to bond the aluminum with the component surface, the heat dissolving the carrier portion of the aluminum layer. The remaining portion of the aluminum layer is then heated to a second predetermined temperature for a second predetermined period of time to form an oxidized aluminum layer. Finally, at least one protective thermal layer is applied over the oxidized aluminum layer.
1. A superalloy afterburner seal having high temperature capability comprising:
an additive layer of alumina applied to an exposed surface of the superalloy seal; and
a noble metal layer applied over the alumina providing a highly reflective layer, the seal further characterized by a substantial absence of a subsequent ceramic layer.
2. The afterburner seal of claim 1 , wherein the noble metal layer is selected from a group consisting of platinum, palladium and rhodium.