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Proceedings Paper

Development of molecular adsorber coatings
Author(s): Sharon Straka; Wanda Peters; Mark Hasegawa; Kevin Novo-Gradac; Alfred Wong
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Paper Abstract

As mission, satellite, and instrument performance requirements become more advanced, the need to control adverse onorbit molecular contamination is more critical. Outgassed materials within the spacecraft have the potential to degrade performance of optical surfaces, thermal control surfaces, solar arrays, electronics, and detectors. One method for addressing the outgassing of materials is the use of molecular adsorbers. On Goddard Space Flight Center missions such as Hubble Space Telescope (HST), Tropical Rainfall Measuring Mission (TRMM), and SWIFT, Zeolite-coated cordierite molecular adsorbers were successfully used to collect and retain outgassed molecular effluent emanating from spacecraft materials, protecting critical contamination sensitive surfaces. However, the major drawbacks of these puck type adsorbers are weight, size, and mounting hardware requirements, making them difficult to incorporate into spacecraft designs. To address these concerns, a novel molecular adsorber coating was developed to alleviate the size and weight issues while providing a configuration that more projects can utilize, particularly contamination sensitive instruments. This successful sprayable molecular adsorber coating system demonstrated five times the adsorption capacity of previously developed adsorber coating slurries. The molecular adsorber formulation was refined and a procedure for spray application was developed. Samples were spray coated and tested for capacity, thermal optical/radiative properties, coating adhesion, and thermal cycling. The tested formulation passes coating adhesion and vacuum thermal cycling tests between +140 and -115C. Thermal radiative properties are very promising. Work performed during this study indicates that the molecular adsorber formulation can be applied to aluminum, stainless steel, or other metal substrates that can accept silicate coatings.

Paper Details

Date Published: 7 September 2010
PDF: 8 pages
Proc. SPIE 7794, Optical System Contamination: Effects, Measurements, and Control 2010, 77940C (7 September 2010); doi: 10.1117/12.864483
Show Author Affiliations
Sharon Straka, NASA Goddard Space Flight Ctr. (United States)
Wanda Peters, NASA Goddard Space Flight Ctr. (United States)
Mark Hasegawa, NASA Goddard Space Flight Ctr. (United States)
Kevin Novo-Gradac, Stinger Ghaffarian Technologies, Inc. (United States)
Alfred Wong, Stinger Ghaffarian Technologies, Inc. (United States)

Published in SPIE Proceedings Vol. 7794:
Optical System Contamination: Effects, Measurements, and Control 2010
Sharon A. Straka; Nancy Carosso, Editor(s)

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