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  • 1
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    Space stable thermal control coatings (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The MOX method, i.e., the use of zinc and titanium oxalate precursors, has the distinct advantages of simple and rapid processing, and of controlled pigment particle size. The chemical identify of TiOX was determined. The Zn/Ti ratio effect on the reflectance spectra and ultraviolet irradiation stability in vacuum for Zn2TiO4 was examined. Optimized processing parameters are considered for reproducibly obtaining a pigment of the most desirable optical properties and behavior.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA-CR-149978 , IITRI-D6118-4(TAR)
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Method of preparing zinc orthotitanate pigment (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Zinc orthotitanate suitable for use as a pigment for spacecraft thermal control coatings is prepared by heating a slightly zinc deficient reaction mixture of precipitated oxalates of zinc and titanium. The reaction mixture can be formed by coprecipitation of zinc and titanium oxalates from chloride solution or by mixing separately precipitated oxalates. The mixture is first heated to 400 to 600 C to remove volatiles and is then rapidly heated at 900 to 1200 C. Zinc orthotitanate produced by this method exhibits the very fine particle size needed for thermal control coatings as well as stability in a space environment.
    Keywords: NONMETALLIC MATERIALS
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  • 3
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    Space stable thermal control coatings (1977)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Efforts to develop an engineering paint were concentrated on inorganic silicate-bonded systems as opposed to the silicone coatings. The UV-vacuum stability of potassium silicate-Zn2TiO4 paints were shown to be quite good. Reflectance optimization of these systems is being studied by maximizing thickness and pigment to binder ratio.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA-CR-150276 , IITRI-D6118-12
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    NASA TECHNICAL REPORTS
  • 4
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    Development of space stable thermal control coatings for use on large space vehicles (1975)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The development of a large scale manufacturing method for the production of a stable zinc orthotitanate pigment is studied, with emphasis placed on the comprehensive analysis of the properties and environmental stability of oxalate precursor zinc orthotitanate pigments and of the preparative conditions (time and temperature) leading to optimum properties and optical stability.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA-CR-143850 , IITRI-C6233-48
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  • 5
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    Development of space stable thermal control coatings for use on large space vehicles (1975)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Pigment manufacturing development, binder development, environmental effects evaluations, and general coatings investigations are discussed. The relative emphasis on each of these tasks varied according to the urgency of the problems elucidated and the availability of time and funds. Emphasis is placed on the development of a mixed oxalate precursor zinc orthotitanate pigment manufacturing method and related studies and on complementary environmental testing and evaluation activities.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA-CR-143879 , IITRI-C6233-52
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  • 6
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    Plasma-sprayed self-lubricating coatings (1982)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: One of the most important criterion for acceptable commercial application of a multiple phase composition is uniformity and reproducibility. This means that the performance characteristics of the coat - e.g., its lubricating properties, bond strength to the substrate, and thermal properties - can be readily predicted to give a desired performance. The improvement of uniformity and reproducibility of the coats, the oxidation behavior at three temperature ranges, the effect of bond coat and the effect of preheat treatment as measured by adhesive strength tests, coating examination procedures, and physical property measurements were studied. The following modifications improved the uniformity and reproducibility: (1) changes and closer control in the particle size range of the raw materials used, (2) increasing the binder content from 3.2% to 4.1% (dried weight), and (3) analytical processing procedures using step by step checking to assure consistency.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA-CR-3680 , NAS 1.26:3680 , IITRI-M06051-33
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  • 7
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    Space stable thermal control coatings (1982)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A specification quality zinc orthotitanate coating was developed. This silicate-bonded Zn2TiO4 coating is discussed. The effects of precursor chemistry, precursor mixing procedures, stoichiometry variations, and of different heat treatments on the physical and optical properties of Zn2TiO4 are investigated. Inorganic silicates are compared to organic silicone binder systems. The effects of pigment to binder ratio, water content, and of different curing procedures on the optical and physical properties of Zn2TiO4 potassium silicate coatings are also studied. Environmental tests were conducted to determine the UV vacuum stability of coatings for durations up to 5000 equivalent Sun hours.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA-CR-170719 , NAS 1.26:170719 , IITRI-M06020-62
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  • 8
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    Evaluation of the effects of solar radiation on glass (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The degradation of glass used on space structures due to electromagnetic and particulate radiation in a space environment was evaluated. The space environment was defined and a simulated space exposure apparatus was constructed. Four optical materials were exposed to simulated solar and particulate radiation in a space environment. Sapphire and fused silica experienced little change in transmittance, while optical crown glass and ultra low expansion glass darkened appreciably. Specimen selection and preparation, exposure conditions, and the effect of simulated exposure are discussed. A selective bibliography of the effect of radiation on glass is included.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA-CR-161247 , D6139
    Format: application/pdf
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  • 9
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    Evaluation of the effects of solar radiation on glasses (1981)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Four optical materials were exposed to simulated solar and particulate radiation in a space environment. Sapphire and fused silica experienced little change in transmittance while optical crown glass and ultra low expansion glass darkened appreciably. A complete analysis of the 500 hour simulated space exposure test was conducted. Additionally, studies were performed to aid in sample selection for a 100 hour simulated exposure test.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA-CR-161907 , IITRI-M06055-10
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  • 10
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    Inorganic Zn2TiO4 thermal control coatings (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Silicate-bonded zinc orthotitanate thermal control coatings for space applications have been developed. This paper discusses preparation of the pigment, paint formulation and application, and some properties of the coatings. Very high reflectance (low solar absorptance), high emittance, and good stability in an ultraviolet-vacuum environment are indicated for this paint.
    Keywords: NONMETALLIC MATERIALS
    Type: The enigma of the eighties: Environment, economics, energy; Twenty-fourth National Symposium and Exhibition; May 08, 1979 - May 10, 1979; San Francisco, CA
    Format: text
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