Comparison of ceramic waste forms produced by hot uniaxial pressing and by cold pressing and sintering

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Synroc C waste form specimens prepared using the Australian-developed technology are uniaxially pressed in stainless steel bellows at 1200{degrees}C and 20MPa. This produces a material with high chemical and physical durability and with the radioactivity enclosed inside both the waste form and the bellows. An alternative method of producing the ceramic product is to use cold pressing of pellets followed by reactive sintering to provide densification and mineralization. Depending on the scale of waste form preparation required and on the activity level and nature of the waste streams, the cold press and sinter method may have advantages. To evaluate the ... continued below

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11 p.

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Oversby, V.M. & Vance, E.R. September 1, 1994.

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  • Oversby, V.M. Lawrence Livermore National Lab., CA (United States)
  • Vance, E.R. Australian Nuclear Science and Technology Organization, Lucas Heights (Australia)

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Synroc C waste form specimens prepared using the Australian-developed technology are uniaxially pressed in stainless steel bellows at 1200{degrees}C and 20MPa. This produces a material with high chemical and physical durability and with the radioactivity enclosed inside both the waste form and the bellows. An alternative method of producing the ceramic product is to use cold pressing of pellets followed by reactive sintering to provide densification and mineralization. Depending on the scale of waste form preparation required and on the activity level and nature of the waste streams, the cold press and sinter method may have advantages. To evaluate the effects of production method on waste form characteristics, especially resistance to dissolution or leaching of waste elements, we have prepared two simulated waste samples for evaluation. Both samples were prepared from liquid precursor materials (alkoxides, nitrates, and colloidal silica) and then doped with waste elements. The precursor material in each case corresponded to a basic phase assemblage of 60% zirconolite, 15% nepheline, 10% spinel, 10% perovskite, and 5% rutile. One sample was doped with 25% by weight of U; the other with 10% by weight each of U and Gd. Each sample was calcined at 750{degrees}C for 1 hr. in a 3.5% H{sub 2} in N{sub 2} atmosphere. Then one portion of each sample was hot pressed at temperatures ranging from 1120 to 1250{degrees}C and 20MPa pressure in steel bellows. A separate portion of each sample was formed into pellets, cold pressed, and sintered in various atmospheres at 1200{degrees}C to produce final products about 2/3 cm in diameter. Samples were then examined to determine density of the product, grain sizes of the phases, phase assemblage, and the location of the U and Gd in the final phases. Density data indicate that sintering gives good results provided that the samples are held at 200{degrees}C for long enough to allow trapped gases to escape.

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11 p.

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OSTI as DE95015893

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  • 18. international symposium on the scientific basis for nuclear waste management, Kyoto (Japan), 23-27 Oct 1994

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  • Other: DE95015893
  • Report No.: UCRL-JC--117039
  • Report No.: CONF-941075--8
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 104458
  • Archival Resource Key: ark:/67531/metadc620607

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  • September 1, 1994

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  • June 16, 2015, 7:43 a.m.

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  • Feb. 16, 2016, 3:19 p.m.

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Oversby, V.M. & Vance, E.R. Comparison of ceramic waste forms produced by hot uniaxial pressing and by cold pressing and sintering, article, September 1, 1994; California. (digital.library.unt.edu/ark:/67531/metadc620607/: accessed August 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.