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- W240152318 abstract "A wide variety of iron-base, nickel-base, and copper-base alloys were subjected to oxidation, sulfidation, and oxidation-sulfidation treatments to form thin surface films with selective optical properties. Films were analyzed by X-ray diffraction, scanning electron microscopy, metallography, and X-ray dispersive energy analysis. Absorptances were determined in both the solar and infrared regions. Oxide films formed on iron alloys had high absorptances, but the emittances were too high to be of practical interest. Both nickel-base and copper-base alloys formed films which gave interesting combinations of absorptance and emittance. Nickel alloys formed films which had much lower emittances than films on pure nickel for any thickness, although emittance increased with film thickness. Copper alloys formed films having very low emittances and which gave high values (13-16) for the ratio of absorptance to emittance. Sulfidation of the alloys showed that Ni/sub 3/S/sub 2/ was a poor selective absorber, but Cu/sub 2/S had excellent properties. Films containing both sulfides and oxides had excellent selective solar properties, depending upon the phases formed and their relative amounts. The good properties were attributed to either the composite or layer effects. Interpretation of the properties on the basis of band-gap energies was unsuccessful, although the defect structures of themore » various oxides suggest that oxidation of alloys, allowing incorporation of impurities into the oxide, increased the vacancy concentration and introduced new energy levels.« less" @default.
- W240152318 created "2016-06-24" @default.
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- W240152318 date "1982-09-01" @default.
- W240152318 modified "2023-09-27" @default.
- W240152318 title "Selective solar absorptance of some oxide and sulfide films grown in-situ on binary metal alloys. Final report" @default.
- W240152318 hasPublicationYear "1982" @default.
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