Accession Number : AD0455068

Title :   HIGH TEMPERATURE SOLAR ABSORBER COATINGS. PART II.

Descriptive Note : Rept. for 1 Jun 63-1 Jul 64,

Corporate Author : HONEYWELL RESEARCH CENTER HOPKINS MN

Personal Author(s) : Schmidt, Roger N. ; Park, K. C. ; Janssen, John E.

Report Date : SEP 1964

Pagination or Media Count : 89

Abstract : The objective of this project was to develop solar absorber coatings stable up to 1000 C in a vacuum of 10 to the minus 6th power torr with solar absorptance of 0.9 and emittance of 0.1 at 1000 C. Significant progress toward achieving these goals was made during the past year. A coating system consisting of multiple layers of Al2O3 and molybdenum on a molybdenum substrate exhibited a solar absorptance of 0.91 with an emittance of 0.16 at 1000 F. It is expected that the solar absorptance of this system will be equally good at higher temperatures but the emittance will increase. Computer programs for a theoretical analysis of interference film systems have been prepared for both normal and oblique incidence of light on multilayer metal and dielectric film systems. Theoretical reflectance data for thin film systems computed for normal incident light were in good qualitative agreement with experiments. (Author)

Descriptors :   (*ABSORPTION, COATINGS), (*COATINGS, SOLAR RADIATION), METAL FILMS, ABSORPTION, ULTRAVIOLET RADIATION, STABILITY, RADIATION EFFECTS, REFLECTION, TEMPERATURE, HIGH TEMPERATURE, ALUMINUM COMPOUNDS, OXIDES, MOLYBDENUM, IRON COMPOUNDS, MAGNESIUM COMPOUNDS, NICKEL COMPOUNDS, TANTALUM COMPOUNDS, GOLD, MEASUREMENT, EXPERIMENTAL DATA, FILMS.

Distribution Statement : APPROVED FOR PUBLIC RELEASE