Dense UN specimens for property tests were fabricated primarily by an isostatic hot-pressing technique in which consolidated powder sealed in a refractory metal container was subjected to a 10,000-psi external gas pressure at 1480 to 1540 deg C for 3 to 4 hr. The thermal conductivity of uranium mononitride increased from 0.04 cal/(cm)(sec)( deg C) at 200 deg C to 0.06 cal/ (sec)(cm/sup 2/)( deg C) at 1000 deg C, which by an integrated thermal- conductivity criterion, makes it some eight times more effective than UO/sub 2/ in transferring heat. Thermal-expansion coefficients of 9.0 x 10/sup -6/ per deg C …
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Dense UN specimens for property tests were fabricated primarily by an isostatic hot-pressing technique in which consolidated powder sealed in a refractory metal container was subjected to a 10,000-psi external gas pressure at 1480 to 1540 deg C for 3 to 4 hr. The thermal conductivity of uranium mononitride increased from 0.04 cal/(cm)(sec)( deg C) at 200 deg C to 0.06 cal/ (sec)(cm/sup 2/)( deg C) at 1000 deg C, which by an integrated thermal- conductivity criterion, makes it some eight times more effective than UO/sub 2/ in transferring heat. Thermal-expansion coefficients of 9.0 x 10/sup -6/ per deg C and 9.9 x 10/sup -6/per deg C over the ranges 20 to 800 deg C and 20 to 1600 deg C, respectively, were measured. UN retained about 80% of its room- temperature hardness at 1100 deg C. Above this temperature, the hardness dropped rapidly with increasing temperature. The specific heat is cal per g mole can be conveniently described by the equition C = 13.32 + 1.19 x 10/sup -3/ T --2.10 x 10/sup 5/ T/sup -2/ over the range 273 to 142 3 deg K. Electrical conductivity dropped with increasing temperature a metallic characteristic. Anomalies were noted in attempts to measure the hydiogen solubility and the resistance to water corrosion. UN is apparently not attacked by NaK within 1500 hr at temperatures up to 480 deg C. (auth)
Notes
Work Performed under United States-Euratom Joint Research and Development Program. Orig. Receipt Date: 31-DEC-63
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Speidel, E. O. & Keller, D. L.Fabrication and Properties of Hot-Pressed Uranium Mononitride,
report,
May 30, 1963;
Columbus, Ohio.
(https://digital.library.unt.edu/ark:/67531/metadc1035774/:
accessed October 13, 2026),
University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu;
crediting UNT Libraries Government Documents Department.
