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  • FACILITIES, RESEARCH, AND SUPPORT  (1)
  • MATERIALS, METALLIC  (1)
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  • 1
    Publication Date: 2019-05-29
    Description: Potassium corrosion test loop development - helium analysis system to measure impurities in vacuum purged, inert gas welding chamber
    Keywords: FACILITIES, RESEARCH, AND SUPPORT
    Type: NASA-CR-54168
    Format: application/pdf
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  • 2
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    In:  Other Sources
    Publication Date: 2019-06-27
    Description: Resistively heated strip specimens of Cb-1Zr alloy were exposed at 927 C in a vacuum chamber at various levels of total pressure in the 1-microtorr range and at various oxygen partial pressures in the .1-microtorr range. Oxygen reaction rates (sticking probabilities) were found to depend on whether or not the specimens were annealed immediately before the test exposure. It is shown that a normally undetectable oxide film exists on the Cb-1Zr surface as a result of oxidation by ambient air, and this film reduces the sticking probability as compared with a clean metal surface. The alloy is considerably strengthened by addition of oxygen to a level of about 6000 ppm, while still maintaining reasonably good room temperature ductility.
    Keywords: MATERIALS, METALLIC
    Format: text
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