Production of High-purity Thermal Control Coatings PDF Download
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Author: Air Force. Materials Laboratory
Publisher:
ISBN:
Category :
Languages : en
Pages : 81
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Book Description
The development of pigments for high-purity thermal control coatings is continuing. Results from the first Van de Graaff proton-ultraviolet tests were obtained, and are interpreted. The second combined environmental test was an electron-ultraviolet exposure. Results are reported and interpreted where possible; conclusions derived from the separate ultraviolet environment were not unequivocal because scattered electrons were found to be present in that section of the test chamber. Three separate UV exposures were also carried out. Based on these tests, a reactor grade zirconia, and a high-purity optical grade silica were selected for further development and testing. In addition to the impurity effect on initial solar absorptance, alpha-s, the effects of calcination temperature, and rate of cooling have been found to be most important.
Author: Air Force. Materials Laboratory
Publisher:
ISBN:
Category :
Languages : en
Pages : 81
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Book Description
The development of pigments for high-purity thermal control coatings is continuing. Results from the first Van de Graaff proton-ultraviolet tests were obtained, and are interpreted. The second combined environmental test was an electron-ultraviolet exposure. Results are reported and interpreted where possible; conclusions derived from the separate ultraviolet environment were not unequivocal because scattered electrons were found to be present in that section of the test chamber. Three separate UV exposures were also carried out. Based on these tests, a reactor grade zirconia, and a high-purity optical grade silica were selected for further development and testing. In addition to the impurity effect on initial solar absorptance, alpha-s, the effects of calcination temperature, and rate of cooling have been found to be most important.
Author: Defense Documentation Center (U.S.)
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 784
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Book Description
Author: Permanent Court of Arbitration
Publisher:
ISBN:
Category :
Languages : en
Pages : 52
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Book Description
Author: D. M. J. Compton
Publisher:
ISBN:
Category :
Languages : en
Pages : 99
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Book Description
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.
Author: Air Force Materials Laboratory (U.S.)
Publisher:
ISBN:
Category : Materials
Languages : en
Pages : 186
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Book Description
Technical reports published by the Air Force Materials Laboratory during the period 1 January 1968-31 December 1968 are abstracted herein and indexed by branches of the laboratory, technical subject matter, investigator, project monitor and contractor. Reports on research conducted by the Air Force Materials Laboratory personnel as well as that conducted on contract are included.
Author: J. R. Crosby
Publisher:
ISBN:
Category : Coatings
Languages : en
Pages : 78
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Book Description
Author:
Publisher:
ISBN:
Category : Defense contracts
Languages : en
Pages : 366
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Book Description
Abstracts of Air Force Materials Laboratory contracts that were active on 15 August 1966 are reported. The abstracts are ordered by Divisions of laboratory and are indexed by contract number. Each abstract entry provides the title of the contract, contractor, duration, project engineer, objective and progress.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 20
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Book Description
Author: Ernie W. Spisz
Publisher:
ISBN:
Category : Coatings
Languages : en
Pages : 28
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Book Description
Author: National Research Council
Publisher: National Academies Press
ISBN: 0309176026
Category : Technology & Engineering
Languages : en
Pages : 102
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Book Description
This book assesses the state of the art of coatings materials and processes for gas-turbine blades and vanes, determines potential applications of coatings in high-temperature environments, identifies needs for improved coatings in terms of performance enhancements, design considerations, and fabrication processes, assesses durability of advanced coating systems in expected service environments, and discusses the required inspection, repair, and maintenance methods. The promising areas for research and development of materials and processes for improved coating systems and the approaches to increased coating standardization are identified, with an emphasis on materials and processes with the potential for improved performance, quality, reproducibility, or manufacturing cost reduction.
