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  • 1
    facet.materialart.
    Unknown
    X-ray transmission microscope development (1995)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: This report covers the third 6 month period, from February 28, 1995 to August 31, 1995, under this contract. The main efforts during this period were the construction of the X-ray furnace, evaluation and selection of the CCD technology for the X-ray camera, solidification experiments with Al alloys and Al-zirconia composites in the prototype furnace, evaluation of specimens for the particle pushing flight experiment - PEPSI, measurements of emitted spectra from X-ray source, testing of the high resolution X-ray test targets, and the establishment of criteria for and selection of peripheral equipment. In addition to these tasks, two presentations were prepared in this period; one for the AIAA Microgravity Symposium and another for the Gordon Conference on Gravitational Effects in Pyisico-Chemical Systems.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-CR-199441 , NAS 1.26:199441
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Unknown
    X-ray transmission microscope development (1995)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: We are developing a hard x-ray microscope for direct observation of solidification dynamics in metal alloys and metal matrix composites. The Fein-Focus Inc. x-ray source was delivered in September and found to perform better than expected. Confirmed resolution of better than 2 micrometers was obtained and magnifications up to 800X were measured. Nickel beads of 30 micrometer diameter were easily detected through 6mm of aluminum. X-ray metallography was performed on several specimens showing high resolution and clear definition of 3-dimensional structures. Prototype furnace installed and tested.
    Keywords: OPTICS
    Type: NASA-CR-197884 , NAS 1.26:197884
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    The growth of zinc selenide single crystals by physical vapor transport in microgravity (1990)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Growth and characterization studies will be performed on zinc selenide single crystals. The high temperature outgassing behavior of the silica ampoule material will be studied in order to develop a cleaning and bake-out procedure that will minimize the amount of impurities introduced into the vapor from the ampoule materials and in particular during the seal-off procedure. The outgassing behavior of the ZnSe starting material will be studied during high vacuum refinement at elevated temperatures in order to develop a temperature pressure program that will optimize the removal of impurities while minimizing a shift in stoichiometry due to preferred evaporation of the higher fugacity component. The mass spectrometer system was completed, and after calibration, will be used to perform the above tasks. The system and its operation is described in detail.
    Keywords: SOLID-STATE PHYSICS
    Type: NASA-CR-180428 , NAS 1.26:180428
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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