Abstract
Uranium monocarbide is of interest as a possible nuclear fuel and as a material for nuclear thermoelectric conversion. To define more accurately the influence of the conditions of fabrication of uranium monocarbide on its constitution, experiments were undertaken as a result of which the optimum conditions, for obtaining stoichiometric UC were defined. Investigation of the conditions of sintering and hot pressing of UC powder and also conditions for sintering alloys of UC = U resulted in a method of preparing specimens with a porosity of about 5 per cent. The specific gravity of UC powder determined with a pyknometer was 12·97 ± 0·09 g/cm 3, and the micro hardness was 923 ± 56 kg/mm 2. The thermal conductivity of UC in the range 100–700°C was found to be from 0028 to 0·04 cal/cm/sec/°C; the mean thermal coefficient of linear expansion in the interval 20°–1500°C was 11.6 · 10 −6. Specimens of UC thermally cycled in the range 200–1000°C withstood 500 cycles without disintegration. Specimens of UC + U withstood more than 1000 cycles.
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