Patent ID: 7208230

Claim:
A component having a specular reflective system for use in a hot flow path of a high temperature device exposed to radiative energy in which hot gaseous fluids traverse the device in a hot flow path, the component comprising: a substrate material having a surface that forms a fluid boundary for hot gaseous fluids of combustion; and a specular optical reflective coating system comprising three layers, each layer having a preselected thickness, overlying the substrate surface forming the hot fluid boundary, the coating system having a reflective metal layer positioned between a first refractory layer and a second refractory layer, said first refractory layer positioned between the reflective metal layer and the substrate surface, said reflective metal layer having an applied roughness sufficiently smooth to reflect at least about 80% of incident radiation and at least about 75% of hot part radiation, said coating system having a high temperature capability to survive temperatures in the hot flow path so that the coating system reflects at least about 80% of incident radiation away from its surface to the fluids transversing the hot flow path, and wherein the coating system is not subject to oxidation due to contact with the hot gaseous fluids.