Quantitative nondestructive density determinations of very low-density carbon foams

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The carbon density and the carbon distribution in low-density foams that were manufactured by a modified salt-replica process were determined by bulk measurements of weight and volume and by x-ray computed tomography (CT). When determining the carbon density, both methods yielded similar results, however, the high spatial resolution of CT was found to yield nondestructive quantitative information on the carbon distribution that was not available from bulk measurements. The highest and lowest foam densities were found to occur at the edges and the interior, respectively. The carbon density at the edge was found to be a few percent up to ... continued below

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Pages: (8 p)

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Moddeman, W.E.; Kramer, D.P.; Firsich, D.W.; Trainer, P.D.; Back, P.S.; Smith, S.D. et al. January 1, 1991.

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Description

The carbon density and the carbon distribution in low-density foams that were manufactured by a modified salt-replica process were determined by bulk measurements of weight and volume and by x-ray computed tomography (CT). When determining the carbon density, both methods yielded similar results, however, the high spatial resolution of CT was found to yield nondestructive quantitative information on the carbon distribution that was not available from bulk measurements. The highest and lowest foam densities were found to occur at the edges and the interior, respectively. The carbon density at the edge was found to be a few percent up to 20 percent higher than the average foam density. The percentage of carbon buildup at the edge was determined to be inversely proportional to the foal density, and in addition, the gradient compared favorably with calculations from Fick's second low of diffusion. A calculated diffusion coefficient was interpreted in terms of foam manufacturing in the modified salt-replica process. 6 refs., 5 figs., 1 tab.

Physical Description

Pages: (8 p)

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OSTI; NTIS; GPO Dep.

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  • Review of progress in quantitative nondestructive evaluation (NDE), Brunswick, ME (United States), 28 Jul - 2 Aug 1991

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  • Other: DE92002031
  • Report No.: MLM-3706(OP)
  • Report No.: CONF-9107112--3
  • Grant Number: AC04-88DP43495
  • Office of Scientific & Technical Information Report Number: 5121978
  • Archival Resource Key: ark:/67531/metadc1059416

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  • January 1, 1991

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  • Jan. 22, 2018, 7:23 a.m.

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  • Jan. 29, 2018, 12:12 p.m.

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Moddeman, W.E.; Kramer, D.P.; Firsich, D.W.; Trainer, P.D.; Back, P.S.; Smith, S.D. et al. Quantitative nondestructive density determinations of very low-density carbon foams, article, January 1, 1991; United States. (digital.library.unt.edu/ark:/67531/metadc1059416/: accessed November 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.