Download or read book The Effects of Extreme Ultraviolet Radiation on the Optical Properties of Thermal control Coatings written by Donald D. Swofford (CAPT, USAF.) and published by . This book was released on 1967 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effects of Extreme Ulytaviolet i e Ultraviolet on the Optical Properties of Thermal Control Coatings written by D. D. Swofford and published by . This book was released on 1968 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Optical Properties of Thermal Control Coatings After Weathering Simulated Ascent Heating and Simulated Space Radiation Exposure written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2019-01-19 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Spacecraft radiators reject heat to their surroundings and coatings play an important role in this heat rejection. The coatings provide the combined optical properties of low solar absorptance and high infrared emittance. The coatings are applied to the radiator panel in a number of ways, including conventional spraying, plasma spraying, or as an applique. Not designed for a terrestrial weathering environment, the durability of spacecraft paints, coatings, and appliques upon exposure to weathering and subsequent exposure to ascent heating, solar wind, and ultraviolet radiation was studied. In addition to traditional aluminum panels, new isocyanate ester composite panels were exposed for a total of 90 days at the Atmospheric Exposure Site of Kennedy Space Center's (KSC) Beach Corrosion Facility for the purpose of identifying their durability to weathering. Selected panel coupons were subsequently exposed to simulated ascent heating, solar wind, and vacuum ultraviolet (UV) radiation to identify the effect of a simulated space environment on as-weathered surfaces. Optical properties and adhesion testing were used to document the durability of the paints, coatings, and appliques. Jaworske, Donald A. and Tuan, George C. and Westheimer, David T. and Peters, Wanda C. and Kauder, Lonny R. Glenn Research Center; Goddard Space Flight Center; Johnson Space Center NASA/TM-2008-215259, E-16525
Download or read book The Effects of Extreme Ultraviolet Radiation on the Reflectance of Thermal Control Surface Coatings written by James McMahon Cowie and published by . This book was released on 1965 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effects of ultraviolet radiation in the 500A to 2,000A wavelength region on the spectral reflectance and integrated solar absorptance of three thermal control surface coatings were investigated. The coatings investigated were polished 99.99+% aluminum, and silicone alkyd and melamine modified polyvinyl butyral pigmented 60% by volume with titanium dioxide (TiO2). Samples of the coatings were exposed for 96 hours in 0.000001 Torr vacuo to radiation from a capillary discharge of hydrogen gas. The spectral reflectance in the 4,000A to 7,000A and 20,000A to 150,000A regions was determined before and after the 96 hour exposure periods. It was found that the maximum decrease in spectral reflectance occurred between 4,200A and 4,600A and was equal to 0.10 for the silicone alkyd/TiO2, 0.07 for the melamine modified polyvinyl butyral/TiO2, and 0.06 for the polished aluminum. The integrated solar absorptance was calculated before and after the exposure periods. It was found that the integrated solar absorptance changed from 0.196 to 0.219 for the silicone alkyd/TiO2, from 0.232 to 0.248 for the melamine modified polyvinyl butyral/TiO2, and from 0.27 to 0.30 for the polished aluminum. (Author).
Download or read book The Effects of Extreme Ultraviolet Radiation on the Reflectance of Thermal Control Surface Coatings written by James McMahon Cowie (CAPT, USAF.) and published by . This book was released on 1965 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Change of Reflective Properties of Three Selected Thermal Control Coatings Due to Extreme Ultraviolet Radiation and Vacuum written by Donald Eugene Stroud (CAPT, USAF.) and published by . This book was released on 1968 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Technical Note written by and published by . This book was released on 1972 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Vacuum and Ultraviolet radiation Effects on Binders and Pigments for Spacecraft Thermal control Coatings written by Donald J. Progar and published by . This book was released on 1971 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper presents an evaluation of several silicone resin binders and powdered inorganic pigments for potential use in spacecraft thermal-control paint formulations. The pigments were selected on the basis of a hypothesis relating the heat of formation of a compound to the compound's resistance to ultraviolet-radiation-induced degradation. Reflectance measurements were made in situ to determine degradatiorna tes due to ultraviolet radiation. The tested polydimethylsiloxane resins were not significantly affected by long exposures to ultraviolet radiation. All the pigments, which were dispersed in a polydimethylsiloxane resin, were degraded by ultraviolet radiation as determined by an increase of solar absorptance. For the materials evaluated in this study, no evidence was found to indicate that pigments with high heats of formation were resistant to ultraviolet degradation.
Download or read book System Requirements for Thermal Control Coatings written by Eugene N. Borson and published by . This book was released on 1967 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main factors usually considered in the selection of thermal control coatings for spacecraft are as follows: (a) Optical properties and their quantitative uncertainties. (b) Application, ground environment, and cleaning. (c) Atmospheric heating. (d) Particulate and ultraviolet radiation stability. (e) Outgassing, toxicity, and flammability. (f) Mechanical properties, (g) Cost. (h) Availability. These items are discussed and examples are presented. Attention is given to optical property uncertainties, and typically used coatings are used as examples. (Author).
Download or read book Ultraviolet Radiation Effects on the Infrared Damage Rate of a Thermal Control Coating written by James A. Bass and published by . This book was released on 1972 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Thermal Design Principles of Spacecraft and Entry Bodies written by Jerry Bevans and published by Elsevier. This book was released on 2012-12-02 with total page 876 pages. Available in PDF, EPUB and Kindle. Book excerpt: Progress in Astronautics and Aeronautics, Volume 21: Thermal Design Principles of Spacecraft and Entry Bodies is a collection of technical papers drawn mainly from the American Institute of Aeronautics and Astronautics Third Thermophysics Specialist Conference, held in Los Angeles, California on June 24-26, 1968 This volume is divided into three parts. The first part covers some aspects of thermal processes and design, including thermal analysis, convection, radiation, ablation, and space rocket effects. The second part surveys the remote measurements of the thermophysical and thermal radiation properties and joint conductance, which are critical criteria for space thermal design. The third part focuses on the space environmental effects on thermal coatings. This part deals first with the theory of radiative degradation, followed by a presentation of the laboratory measurements. This part also looks into the results of several flight experiments. This book will be of great value to thermophysicists, space engineers, and designers who are working in the space science fields.
Download or read book Mechanisms of Degradation of Polymeric Thermal Control Coatings written by D. M. J. Compton and published by . This book was released on 1969 with total page 99 pages. Available in PDF, EPUB and Kindle. Book excerpt: Progress of an investigation on the mechanisms of degradation of white pigments used in polymeric thermal control coatings by ultraviolet radiation is reported. The materials investigated were rutile (TiO2) with different controlled impurity levels and surface treatments and high-purity strontium titanate (SrTiO3). Apparatus combining a gas chromatograph with means for measuring optical reflectance and electrical conductivity enables samples of pigments to be investigated in a controlled environment. Changes in optical properties, produced by exposure to ultraviolet light, are correlated with gas evolution and adsorption. Some optical changes were correlated with gas evolution and electrical conductivity. The gas evolved in all cases was CO2, with no O2 being observed. Carbonaceous impurities found in these materials are believed to play a role in the damage process. Instrumentation and test techniques were developed, including a recently completed reflectometer of novel design. A comparison was made between chemical reduction of various rutile pigments and the effects of uv light: Chemical reduction produces changes in optical and other properties that correlate with one of the two types of effects produced by uv light (reduction of reflectance near one micron) and the relative susceptibility of different pigments to chemical reductions similar to their relative susceptibility to uv degradation.
Download or read book Effects of Vacuum ultraviolet Environment of the Optical Properties of Bright Anodized Aluminum written by James H. WEAVER and published by . This book was released on 1965 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: The rapid increase in space vehicle design reliability and lifetime requirements has created a serious problem in the selection of materials for passive temperature control. The major difficulty is the prediction of the degradation of the thermal radiation properties of these materials under the space environment. Bright anodized aluminum coatings are known to possess the desired optical properties for passive temperature control and are being considered for space vehicle application. The effects of the vacuum-ultraviolet environment on the optical properties of bright anodized aluminum have been determined. The optical properties of the bright anodized aluminum system are only slightly altered by ultraviolet radiation in air. However, the combined vacuum-ultraviolet radiation is the most detrimental to the reflectance of bright anodized coatings prepared by the sulfuric acid process. The color centers formed during exposure causes a gradual increase in absorption up to 120 hours exposure. This increase in solar absorption causes the alpha sub s/epsilon ration to increase to 0.42 after approximately 120 hours exposure, but after this change, very little further change is noted, unlike most organic and inorganic coatings. (Author).
Download or read book NASA Scientific and Technical Reports written by United States. National Aeronautics and Space Administration Scientific and Technical Information Division and published by . This book was released on 1970 with total page 966 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Vacuum ultraviolet Environment on Optical Properties of Bright Anodized Aluminum Temperature Control Coatings written by James H. Weaver and published by . This book was released on 1968 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Scientific and Technical Reports and Publications for 1969 A Selected Listing written by United States. National Aeronautics and Space Administration. Scientific and Technical Information Division and published by . This book was released on 1970 with total page 956 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evaluation of Thermal Control Coatings and Polymeric Materials Exposed to Ground Simulated Atomic Oxygen and Vacuum Ultraviolet Radiation written by R. R. Kamenetzky and published by . This book was released on 1995 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:
