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  • 1
    Electronic Resource
    Electronic Resource
    Spiral Crystals of Meconin (1957)
    [s.l.] : Nature Publishing Group
    Nature 180 (1957), S. 1412-1412 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1801412a0
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Spiral Crystals of Meconin (1957)
    Springer Nature
    Details
    Publication Date: 1957-12-01
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Springer Nature
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    PAPER CURRENT
  • 3
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    Creep of plasma-sprayed-ZrO2 thermal-barrier coatings (1982)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Specimens of plasma-sprayed-zirconia thermal-barrier coatings with three different porosities and different initial particle sizes were deformed in compression at initial loads of 6900, 13,800, and 24,100 kPa (1000, 2000, and 3500 psi) and temperatures of 1100, 1250, and 1400 C. The coatings were stabilized with lime, MgO, and two different concentrations of Y2O3. Creep began as soon as the load was applied and continued at a constantly decreasing rate until the load was removed. Temperature and stabilization had a pronounced effect on creep rate while the stress, particle size, and porosity had a lesser effect. Creep deformation was due to cracking and particle sliding.
    Keywords: NONMETALLIC MATERIALS
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Improved uniformity of multiphase ceramic-metal plasma-sprayed coats (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Processing-technology development of a multiphase, self-lubricating, plasma-spray powder resulted in greater uniformity and reproducibility of plasma-sprayed coats. The effect of particle-size variation, binder concentration, and reproducible processing parameters are reported. Greater adhesive strengths of coats to substrates were achieved by particle-size variation, use of an intermediate bond coat such as Ni-Cr, or heat treatment. Quantitative analyses of polished, coated specimens are also given.
    Keywords: CHEMISTRY AND MATERIALS (GENERAL)
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Preparation of zinc orthotitanate (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Use of decomposable precursors to enhance zinc oxide-titanium dioxide reaction and rapid fixing results in rapid preparation of zinc orthotitanate powder pigment. Preparation process allows production under less stringent conditions. Elimination of powder grinding results in purer that is less susceptible to color degradation.
    Keywords: MATERIALS
    Type: MFS-23345 , NASA Tech Briefs (ISSN 0145-319X); 2; 2; P. 3
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Creep of plasma sprayed zirconia (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Specimens of plasma-sprayed zirconia thermal barrier coatings with three different porosities and different initial particle sizes were deformed in compression at initial loads of 1000, 2000, and 3500 psi and temperatures of 1100 C, 1250 C, and 1400 C. The coatings were stabilized with lime, magnesia, and two different concentrations of yttria. Creep began as soon as the load was applied and continued at a constantly decreasing rate until the load was removed. Temperature and stabilization had a pronounced effect on creep rate. The creep rate for 20% Y2O3-80% ZrO2 was 1/3 to 1/2 that of 8% Y2O3-92% ZrO2. Both magnesia and calcia stabilized ZrO2 crept at a rate 5 to 10 times that of the 20% Y2O3 material. A near proportionality between creep rate and applied stress was observed. The rate controlling process appeared to be thermally activated, with an activation energy of approximately 100 cal/gm mole K. Creep deformation was due to cracking and particle sliding.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA-CR-167868 , NAS 1.26:167868 , IITRI-M06071-20
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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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
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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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
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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