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Proceedings Paper

TixAlyN coatings for temperature control of spacecraft
Author(s): Maria Brogren; Geoffrey L. Harding; Richard Karmhag; Gunnar A. Niklasson; Carl-Gustaf Ribbing; Lars Stenmark
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Paper Abstract

Thermal control is an important issue in small-scale satellite design, and thin film coatings suit the limited mass and volume constraints. Group IVB transition metal nitride films meet the criteria that the satellite surface must be mechanically and chemically stable, and electrically conducting. Thin film TixAlyNz coatings have been investigated and tailored for temperature control. The films were deposited by reactive sputtering on aluminum substrates in N2/Ar-atmosphere. The solar absorptance, (alpha) , and thermal emittance, (epsilon) , were calculated from spectral reflectance measurements. It was found that an optimization of film composition leads to a reduced equilibrium temperature. The composition temperature. The composition Ti0.16Al0.41N0.43 has a flatter reflectance curve than TiN, and was found to be close to optimal. By varying the film thickness, interference effects could further reduce the equilibrium temperature. A 650 nm Ti0.16Al0.41N0.43 film showed a reflectance interference minimum positioned at the maximum of the blackbody spectrum, resulting in an increased emittance. Neglecting internal heat contributions, the lowest calculated equilibrium temperature was 34.6 degrees C for this film.

Paper Details

Date Published: 7 September 1999
PDF: 9 pages
Proc. SPIE 3738, Advances in Optical Interference Coatings, (7 September 1999); doi: 10.1117/12.360120
Show Author Affiliations
Maria Brogren, Uppsala Univ. (Sweden)
Geoffrey L. Harding, Uppsala Univ. (Germany)
Richard Karmhag, Uppsala Univ. (Sweden)
Gunnar A. Niklasson, Uppsala Univ. (Sweden)
Carl-Gustaf Ribbing, Uppsala Univ. (Sweden)
Lars Stenmark, Uppsala Univ. (Sweden)

Published in SPIE Proceedings Vol. 3738:
Advances in Optical Interference Coatings
Claude Amra; H. Angus Macleod, Editor(s)

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