Characterization of low density carbon foams by x-ray computed tomography (CT) and ion microtomography (IMT)

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Two NDT techniques were used to characterize low-density, microcellular, carbon foams fabricated from a salt replica process. The two techniques are x-ray computed tomography (CT) and ion microtomography (IMT); data are presented on carbon foams that contain high-density regions. The data show that densities which differ by <10% are easily observable for these low density (<100 mg/cm{sup 3}) materials. The data reveal that the carbon foams produced by this replica process have small density variations; the density being {approximately}30% greater at the outer edges than when compared to the interior of the foam. In addition, the density gradient is found ... continued below

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Pages: (9 p)

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Moddeman, W.E.; Kramer, D.P.; Firisch, D.W.; Trainer, P.D. (EG and G Mound Applied Technologies, Miamisburg, OH (USA)); Yancy, R.N. (ARACOR, Dayton, OH (USA)); Weirup, D.L. et al. January 1, 1990.

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Description

Two NDT techniques were used to characterize low-density, microcellular, carbon foams fabricated from a salt replica process. The two techniques are x-ray computed tomography (CT) and ion microtomography (IMT); data are presented on carbon foams that contain high-density regions. The data show that densities which differ by <10% are easily observable for these low density (<100 mg/cm{sup 3}) materials. The data reveal that the carbon foams produced by this replica process have small density variations; the density being {approximately}30% greater at the outer edges than when compared to the interior of the foam. In addition, the density gradient is found to be rather sharp, that is the density drops-off rapidly from the outer edges to a uniform one in the interior of the foam. This edge build-up in carbon density was explained in terms of polymer concentrating on the foam exterior during drying which immediately followed a polymer infusion processing step. Supporting analytical data from other techniques show the foam material to be >99.9% carbon. 4 refs., 7 figs., 1 tab.

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Pages: (9 p)

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OSTI; NTIS; GPO Dep.

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  • Fall meeting of the Materials Research Society, Boston, MA (USA), 24 Nov - 1 Dec 1990

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  • Other: DE91006445
  • Report No.: MLM-3673(OP)
  • Report No.: CONF-901105--64
  • Grant Number: AC04-88DP43495
  • Office of Scientific & Technical Information Report Number: 6179964
  • Archival Resource Key: ark:/67531/metadc1109155

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  • January 1, 1990

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  • Feb. 22, 2018, 7:45 p.m.

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  • April 26, 2018, 7:43 p.m.

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Moddeman, W.E.; Kramer, D.P.; Firisch, D.W.; Trainer, P.D. (EG and G Mound Applied Technologies, Miamisburg, OH (USA)); Yancy, R.N. (ARACOR, Dayton, OH (USA)); Weirup, D.L. et al. Characterization of low density carbon foams by x-ray computed tomography (CT) and ion microtomography (IMT), article, January 1, 1990; United States. (https://digital.library.unt.edu/ark:/67531/metadc1109155/: accessed March 23, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.