COMPATIBILITY OF UNSUPPORTED PYROLYTIC-CARBON COATED URANIUM DICARBIDE PARTICLES WITH WATER VAPOR

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Five batches of pyrolytic-carbon-coated uranium carbide particles were exposed to partial pressures of water vapor ranging from 20 to 635 mm Hg at temperatures of 700 to 1100 deg C. All batches of coated particles had laminar type of coating and contained cores consisting principally of uranium dicarbide. The rate of reaction of the pyrolytic-carbon coatings with water vapor was determined from weight losses. The extent of failure of the coatings during exposure was established by microscopic examination and leaching of the particles with 8M HNO/sub 3/. Differences in the protectiveness of coatings present on the various batches of particles ... continued below

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Pages: 31

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Blakely, J.P.; Smith, N.V. & Overholser, L.G. April 1, 1964.

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Description

Five batches of pyrolytic-carbon-coated uranium carbide particles were exposed to partial pressures of water vapor ranging from 20 to 635 mm Hg at temperatures of 700 to 1100 deg C. All batches of coated particles had laminar type of coating and contained cores consisting principally of uranium dicarbide. The rate of reaction of the pyrolytic-carbon coatings with water vapor was determined from weight losses. The extent of failure of the coatings during exposure was established by microscopic examination and leaching of the particles with 8M HNO/sub 3/. Differences in the protectiveness of coatings present on the various batches of particles are attributable, at least in part, to two types of attack by water vapor, a localized or pitting type and a more general type. Rapid failure of the coatings was indicated at 1100 deg C. The coatings on some batches of particles remained protective at temperatures of 800 to 1000 deg C. (auth)

Physical Description

Pages: 31

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  • Other Information: Orig. Receipt Date: 31-DEC-64

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  • Report No.: ORNL-3598
  • Grant Number: W-7405-ENG-26
  • DOI: 10.2172/4052721 | External Link
  • Office of Scientific & Technical Information Report Number: 4052721
  • Archival Resource Key: ark:/67531/metadc870396

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  • April 1, 1964

Added to The UNT Digital Library

  • Sept. 16, 2016, 12:32 a.m.

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  • Nov. 3, 2016, 6:24 p.m.

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Blakely, J.P.; Smith, N.V. & Overholser, L.G. COMPATIBILITY OF UNSUPPORTED PYROLYTIC-CARBON COATED URANIUM DICARBIDE PARTICLES WITH WATER VAPOR, report, April 1, 1964; Tennessee. (digital.library.unt.edu/ark:/67531/metadc870396/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.