BORON CARBIDE-GRAPHITE NUCLEAR CONTROL-ROD MATERIAL: PREPARATION, THERMAL STABILITY, AND IRRADIATION EVALUATION

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Boron carbide-graphite nuclear control-rod materials containing up to 45 wt% B were prepared by hot-pressing techniques. The densities of these compacts decreased with increasing B content. Compact strengths, however, were noticeably increased with B content of 20 wt%, suggesting that the B acts as a sintering aid. Thermal stability was evaluated by annealing compacts under a variety of temperature and atmospheric conditions. The upper limit of the ioss of 13 was 5% to 10%~ in 200 hr at 2000 deg C--considerably less than would be predicted from the Langmuir evaporation equation. Diffusion of B atoms through the pores of the ... continued below

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Pages: 36

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Goeddel, W.V.; Lonsdale, H.K. & Meyer, R.A. April 24, 1962.

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Description

Boron carbide-graphite nuclear control-rod materials containing up to 45 wt% B were prepared by hot-pressing techniques. The densities of these compacts decreased with increasing B content. Compact strengths, however, were noticeably increased with B content of 20 wt%, suggesting that the B acts as a sintering aid. Thermal stability was evaluated by annealing compacts under a variety of temperature and atmospheric conditions. The upper limit of the ioss of 13 was 5% to 10%~ in 200 hr at 2000 deg C--considerably less than would be predicted from the Langmuir evaporation equation. Diffusion of B atoms through the pores of the graphite, rather than evaporation from the surface, was found to be the rate- controlling step in the loss of B. Compacts containing 20, 30, and 40 wt% B were irradiated at 350 and 700 deg C to 1.0 and 2 4 x 10/sup 21/ nvt(fast). Physical integrity of the compacts was good after irradiation. Slight increases in tensile strength were noted in several instances. (auth)

Physical Description

Pages: 36

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  • Other Information: Orig. Receipt Date: 31-DEC-63

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  • Report No.: GA-3064
  • Grant Number: AT(04-3)-314
  • DOI: 10.2172/4718810 | External Link
  • Office of Scientific & Technical Information Report Number: 4718810
  • Archival Resource Key: ark:/67531/metadc1032907

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Office of Scientific & Technical Information Technical Reports

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  • April 24, 1962

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  • Oct. 18, 2017, 7:39 a.m.

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Goeddel, W.V.; Lonsdale, H.K. & Meyer, R.A. BORON CARBIDE-GRAPHITE NUCLEAR CONTROL-ROD MATERIAL: PREPARATION, THERMAL STABILITY, AND IRRADIATION EVALUATION, report, April 24, 1962; United States. (digital.library.unt.edu/ark:/67531/metadc1032907/: accessed December 14, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.