a substrate selected from the group consisting of metals and ceramics,a diffuse reflective barrier coating on the substrate, the diffuse reflective barrier coating comprising at least 40 percent by weight alumina based on the total solids in the coating, the alumina comprising from 10 to 90 percent by weight first alumina particles having a number average diameter of between 3.0 and 6.0 micrometers, and 10 to 90 percent by weight second alumina particles having a number average diameter of between 0.05 and 0.8 micrometers, anda. The diffuse reflective barrier coating has a surface roughness of less than about 150 microinches RMS. The radiation scattering centers may be voids or second ceramic particles. The diffuse reflective barrier coating includes a transmissive medium having a transmissive-medium index of refraction, and a plurality of radiation-scattering centers distributed in the transmissive medium, the radiation-scattering centers having a scattering-center index of refraction different from the transmissive-medium index of refraction.
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The diffuse reflective barrier coating includes a transmissive medium having a transmissive-medium index of refraction, and a plurality of radiation-scattering centers distributed in the transmissive medium, the radiation-scattering centers having a scattering-center index of refraction different from the.Ī coated article suitable for use at elevated temperature is formed of a substrate made from metal or a ceramic, a diffuse reflective barrier coating overlying the substrate, and a low-emissivity top coat covering the diffuse reflective barrier coating.
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A coated article suitable for use at elevated temperature is formed of a substrate made from metal or a ceramic, a diffuse reflective barrier coating overlying the substrate, and a low-emissivity top coat covering the diffuse reflective barrier coating.