Effect of steam oxidation on the strength and elastic modulus of graphite H-451

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Graphite grade H-451, the reference material used as fuel and reflector elements in General Atomic large high-temperature gas-cooled reactors, was oxidized to 20% burnoff by weight in steam-helium mixtures, and the effects of oxidation on ultimate tensile strength (UTS) and elastic modulus (E) were studied. Large numbers of small cylindrical samples cored from selected locations in a log of preproduction H-451 graphite were oxidized at 1073 and 1273 K (1472/sup 0/ and 1832/sup 0/F) in helium containing 3% water vapor and 5% H/sub 2/. The UTS and E of oxidized specimens were measured and the results compared with those for ... continued below

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Pages: 56

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Velasquez, C.; Johnson, W.; Hightower, G. & Burnette, R. December 1, 1977.

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Description

Graphite grade H-451, the reference material used as fuel and reflector elements in General Atomic large high-temperature gas-cooled reactors, was oxidized to 20% burnoff by weight in steam-helium mixtures, and the effects of oxidation on ultimate tensile strength (UTS) and elastic modulus (E) were studied. Large numbers of small cylindrical samples cored from selected locations in a log of preproduction H-451 graphite were oxidized at 1073 and 1273 K (1472/sup 0/ and 1832/sup 0/F) in helium containing 3% water vapor and 5% H/sub 2/. The UTS and E of oxidized specimens were measured and the results compared with those for nonoxidized control specimens. The average rate of change of UTS and E with burnoff at 1273 K (1832/sup 0/F) ( up to 20% burnoff) averaged 3.6% and 5.2%, respectively. Statistical analysis (comparison of population means) of the low burnoff strength data showed no significant differences between the nonoxidized control and oxidized specimens at burnoffs of up to approximately 2%.

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Pages: 56

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Dep. NTIS, PC A04/MF A01.

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  • Report No.: GA-A-14657
  • Grant Number: EY-76-C-03-0167-017
  • DOI: 10.2172/5094201 | External Link
  • Office of Scientific & Technical Information Report Number: 5094201
  • Archival Resource Key: ark:/67531/metadc1054163

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • December 1, 1977

Added to The UNT Digital Library

  • Jan. 22, 2018, 7:23 a.m.

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  • Feb. 1, 2018, 7:56 p.m.

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Velasquez, C.; Johnson, W.; Hightower, G. & Burnette, R. Effect of steam oxidation on the strength and elastic modulus of graphite H-451, report, December 1, 1977; San Diego, California. (digital.library.unt.edu/ark:/67531/metadc1054163/: accessed October 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.