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THE SPECTRAL EMISSIVITY AND TOTAL NORMAL EMISSIVITY OF COMMERCIAL GRAPHITES AT ELEVATED TEMPERATURES
WATERTOWN ARSENAL LABS MASS
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The spectral emissivities, at an effective wavelength of 0.65 microns, and total normal emissivities, were determined for machined and polished surfaces of the graphites Great Lakes Carbon H1LM and H3LM, and Speer 7100. The spectral emissivities were investigated within 1000 to 3000 C. For machined surfaces, the spectral emissivity decreased with increasing temperature from 0.87 to 0.81 for H1LM from 0.87 to 0.83 for H3LM and from 0.87 to 0.78 for Speer. For polished surfaces, the spectral emissivity remained constant with increasing temperature and the mean value was 0.855 for H1LM 0.777 for H3LM and 0.820 for Speer 7100. The total normal emissivities were investigated from 1600 to 3000 C. For machined surfaces, the mean value of the total normal emissivity was 0.852 for H1LM 0.852 for H3LM and 0.847 for Speer 7100. For polished surfaces, the mean value of the total normal emissivity was 0.802 for H1LM 0.808 for H3LM and 0.800 for Speer 7100. Author
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