Development of Low Thermal Expansion Tungsten UO 2 Cermet Fuel

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An attempt was made to develop a tungsten-uranium dioxide cermet of high fue 1 loading with thermal expans ion approaching that of tungsten and with good dimensional stability on thermal cycling. These goals were sought through the use of tungsten-coated uranium dioxide particles with sufficient locally available void vo lume to accommodate the difference in thermal expansion between the uranium dioxide and the tungsten matrix and through limitation of plastic deformation in the particles during fabrication to avoid mechanical keying of the particles and the matrix. The particles were vibratorily compacted prior to hot pressing. The thermal expansion of the ... continued below

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Marlowe, M.O. & Kaznoff, A.I. March 31, 1970.

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An attempt was made to develop a tungsten-uranium dioxide cermet of high fue 1 loading with thermal expans ion approaching that of tungsten and with good dimensional stability on thermal cycling. These goals were sought through the use of tungsten-coated uranium dioxide particles with sufficient locally available void vo lume to accommodate the difference in thermal expansion between the uranium dioxide and the tungsten matrix and through limitation of plastic deformation in the particles during fabrication to avoid mechanical keying of the particles and the matrix. The particles were vibratorily compacted prior to hot pressing. The thermal expansion of the cermets was determined and they were thermal cycle tested. The thermal expansion of the cermets was considerably closer to that of tungsten than was observed with previously reported spec imens of similar composition. However, the thermal cycling of the cermets resulted in intolerable growth. This growth could be accounted for by the agglomeration of gases trapped in the uranium dioxide particles during deposition of the tungsten coating.

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  • Report No.: NASA CR-72711
  • Grant Number: NAS 3-10614
  • DOI: 10.2172/972758 | External Link
  • Office of Scientific & Technical Information Report Number: 972758
  • Archival Resource Key: ark:/67531/metadc929303

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Office of Scientific & Technical Information Technical Reports

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  • March 31, 1970

Added to The UNT Digital Library

  • Nov. 13, 2016, 7:26 p.m.

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  • Dec. 8, 2016, 3:37 p.m.

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Marlowe, M.O. & Kaznoff, A.I. Development of Low Thermal Expansion Tungsten UO 2 Cermet Fuel, report, March 31, 1970; United States. (digital.library.unt.edu/ark:/67531/metadc929303/: accessed December 13, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.