Abstract
The normal spectral emittance of Inconel and type 321 stainless steel specimens with six different surface treatments, including application of National Bureau of Standards ceramic coatings A418 and N‐143, was determined at 900°, 1200°, 1500°, and 1800°F. over the wave‐length range 1.5 to 15 μ. The specimens with different surface treatments had markedly different spectral emittance curves. The bare polished specimens had the lowest spectral emittarce at all wave lengths, and the specimens coated with A–418 had the highest spectral emittarce over most of the range 5 to 15 μ. The spectral emittance of all specimens increased with temperature at all wave lengths.
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