INVESTIGATION OF THE EFFECT OF SURFACE CONDITIONS ON THE RADIANT PROPERTIES OF METALS. PART 2. MEASUREMENTS ON ROUGHENED PLATINUM AND OXIDIZED STAINLESS STEEL
Technical rept. 1 Jan 1965-15 Sep 1966
LOCKHEED MISSILES AND SPACE CO INC PALO ALTO CA PALO ALTO RESEARCH LAB
Pagination or Media Count:
Experimental results are presented to show the effect of surface roughness and of surface oxidation on the radiant properties of platinum and of 304 stainless steel. The radiant properties investigated include total and spectral normal, hemispherical, and directional emittance as a function of emission angle, polarization, temperature, and surface roughness or oxide film thickness. Emittance data are presented for five platinum samples with surface roughness values between 0.20 and 2.50 microns, rms, at five temperatures between 865 and 1645 K, and at selected wavelengths between 1 and 12 microns. Similar data are presented for nine stainless steel samples with surface oxide film-thickness values between 0 and 1.5 microns, at five temperatures between 535 and 1090 K. Variations in the radiant properties of each material are explained in terms of the differences in surface characteristics of the samples, or of changes in their surface characteristics as the result of annealing, recrystallization, and oxidation during the high temperature emittance tests. Methods used to evaluate the physical, chemical, and geometrical characteristics of the sample surface include profilometry, optical and electron microscopy, x- ray and electron diffraction, and arc spectroscopy. The advantage and shortcomings of these methods are discussed and typical results are presented.
- Metallurgy and Metallography