THE SPECTRAL EMISSIVITY AND TOTAL NORMAL EMISSIVITY OF COMMERCIAL GRAPHITES AT ELEVATED TEMPERATURES
The spectral emissivities, at an effective wavelength of 0.65 microns, and total normal emissivities, were determined for both machined and polished surfaces of the graphites Great Lakes Carbon H1LM, Great Lakes Carbon H3LM, and Speer 7100. The spectral emissivities were investigated from 1000 to 3000 deg C. For machined surfaces, the spectral emissivity decreased with increasing temperature from 0.87 to 0.81 for H1LM; 0.87 to 0.83 for H3LM; and 0.87 to 0.78 for Speer. For polished surfaces, the spectral emissivity appeared to remain constant with increasing temperature and the mean value was found to be 0.855 for H1LM; 0.777 for H3LM; and 0.820 for Speer 7100. The total normal emissivities were investigated from 1600 to 3000 deg C. For machined surfaces, the mean value of the total normal emissivity was found to be 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 found to be 0.802 for H1LM; 0.808 for H3LM; and 0.800 for Speer 7100. (auth)
- Research Organization:
- Watertown Arsenal Labs., Mass.
- NSA Number:
- NSA-16-021042
- OSTI ID:
- 4816095
- Report Number(s):
- WAL-TR-851.2/1
- Resource Relation:
- Other Information: Orig. Receipt Date: 31-DEC-62
- Country of Publication:
- United States
- Language:
- English
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