Patent ID: 7181915

Claim:
A component having a specular reflective surface for use in a core hot flow path of a high temperature device in which hot gaseous fluids traverse the device in a core hot flow path, the component comprising: a substrate: a specular reflective coating having a predetermined thickness overlying the substrate, the specular reflective coating having a surface forming a core hot fluid boundary, the specular reflective material having an applied roughness sufficiently smooth, and having a high temperature capability to survive temperatures in the core hot flow path so that the surface of the specular reflective material reflecis a least about 80% of incident radiation away from its surface to the fluids in the core hot flow path and wherein the coating is not subject to oxidation due to contact with the core hot gaseous fluids; and a ceramic material between the substrate material and the specular reflective coating, the ceramic material forming a thermal barrier overlying the substrate material, a surface of the ceramic material opposite the substrate and adjacent the specular reflective coating having a surface roughness about 50 micro inches and smoother.