EVALUATION OF (Th,U)C$sub 2$, CARBON-COATED (Th,U)C$sub 2$ PARTICLES, AND CARBON COATINGS

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Thorium and uranium carbide nuclear fuel particles were evaluated by metallographic and x-ray diffraction techniques. Techniques were developed to etch the polished surface of Th--U carbide to reveal the grain structure. In addition, techniques to determine particle density and coating thickness were developed. Comparison of the data indicates that the use of spherical particles allowed for more precise determination of the coating thickness, density, and strength of coatings. Strength of individual particles was about 700 to 1300 g per particle. A large scatter in crushing-strength values was observed when individual particles were crushed. Consequently, a relative crushingstrength test was developed ... continued below

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Pages: 41

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Engle, G. B.; Luby, C. S. & Bokros, J. C. April 26, 1962.

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Thorium and uranium carbide nuclear fuel particles were evaluated by metallographic and x-ray diffraction techniques. Techniques were developed to etch the polished surface of Th--U carbide to reveal the grain structure. In addition, techniques to determine particle density and coating thickness were developed. Comparison of the data indicates that the use of spherical particles allowed for more precise determination of the coating thickness, density, and strength of coatings. Strength of individual particles was about 700 to 1300 g per particle. A large scatter in crushing-strength values was observed when individual particles were crushed. Consequently, a relative crushingstrength test was developed for comparing coating strength: loads were applied to a column of particles in stepped increments, and broken coatings were detected by observing a weight gain in moist air from hydrolysis of the Th--U carbides. A correlation of relative crushing strength and coating thickness was obtained. The crystal structure of the C coatings was found to depend on the temperature of deposition in the range from 1400 to 2400 deg C; the twodimensional structure became more defined with increasing deposition temperatures. Subsequent annealing at 2400 deg C of the coatings deposited at 1400 deg C and at 2200 to 2400 deg C produced graphitization, whereas those deposited at 1800 to 2000 deg C retained their two-dimensional character. Macrostructure of the coatings as revealed by metallographic techniques showed a concentric shell-like structure in the 1400 deg C deposits and mottled or conical structure in the 1800 deg C deposits. Annealing to higher temperatures did not alter the general appearance of either macrostructure. (auth)

Physical Description

Pages: 41

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

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  • Report No.: GA-3067
  • Grant Number: AT(04-3)-314
  • DOI: 10.2172/4747467 | External Link
  • Office of Scientific & Technical Information Report Number: 4747467
  • Archival Resource Key: ark:/67531/metadc1026675

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  • April 26, 1962

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  • Oct. 18, 2017, 7:39 a.m.

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  • Dec. 20, 2017, 1:26 p.m.

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Engle, G. B.; Luby, C. S. & Bokros, J. C. EVALUATION OF (Th,U)C$sub 2$, CARBON-COATED (Th,U)C$sub 2$ PARTICLES, AND CARBON COATINGS, report, April 26, 1962; San Diego, California. (digital.library.unt.edu/ark:/67531/metadc1026675/: accessed November 12, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.