Oxide composite nuclear fuel pellet and preparation method thereof
A nuclear fuel and oxide technology, applied in the direction of reactor fuel elements, reactor fuel materials, nuclear engineering, etc., can solve the problems of poor thermal conductivity and low production efficiency, and achieve the goal of reducing sintering temperature, increasing density, and refining grains Effect
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Embodiment 1
[0030] to UO 2 Nano powder (powder particle size is about 100nm) and SiC whisker (whisker length is about 9 μm, diameter is about 1 μm) as raw materials, the mass fraction of silicon carbide whiskers is 5%, and the total amount of raw materials is 50g;
[0031] Put the raw material powder into a ball mill jar, add zirconia grinding balls and 20 mL of ethanol, and ball mill and mix the mixture for 20 h at a speed of 100 r / min.
[0032] After mixing, the slurry was heated and stirred at 90°C and dried; the dried mixed powder was put into a cemented carbide mold for compression molding, and pressed into an embryo body with a mass of about 2g with an axial pressure of 4MPa, and then Compaction is carried out by cold isostatic pressing at a pressure of 100-300Mpa and a holding time of 1-20min.
[0033] Put the green body after cold isostatic pressing into the sintering device of the flash firing system, and pass in nitrogen gas, connect the electrodes at both ends of the green bod...
Embodiment 2
[0036] to UO 2 Nano powder (powder particle size is about 1 μm) and carbon nanotube powder (powder particle size is about 100nm) as raw materials, the mass fraction of carbon nanotubes is 3%, and the total amount of raw materials is 50g;
[0037] Put the raw material powder into a ball mill jar, add zirconia grinding balls and 20 mL of ethanol, and ball mill and mix the mixture for 15 hours at a speed of 100 r / min.
[0038] After mixing, the slurry was heated and stirred at 90°C and dried; the dried mixed powder was put into a cemented carbide mold for compression molding, and pressed into a green body with a mass of about 2g under an axial pressure of 4MPa, and then Cold isostatic pressing is carried out at a pressure of 150Mpa and a holding time of 20min for compaction.
[0039]Put the green body after cold isostatic pressing into the sintering device of the flash firing system, connect the electrodes at both ends of the green body, start the power supply (apply a constant ...
Embodiment 3
[0042] With ThO 2 (powder particle diameter is about 200nm) and carbon nanotube powder (powder particle diameter is about 100nm) is raw material as raw material, and the mass fraction that carbon nanotube accounts for is 10%, and the total amount of raw material is 40g;
[0043] Put the raw material powder into a ball mill jar, add zirconium dioxide grinding balls, 15 mL of ethanol, and ball mill the mixture for 15 hours at a speed of 150 r / min.
[0044] After mixing, the slurry was heated and stirred at 90°C and dried; the dried mixed powder was molded, pressed into a green body with a mass of about 2g under an axial pressure of 4MPa, and then cold isostatic pressed on the pressure 200Mpa, holding time 10min for compaction.
[0045] Put the green body after cold isostatic pressing into the sintering device of the flash firing system, and pass in hydrogen gas, connect the electrodes at both ends of the green body, start the power supply (apply Constant electric field), the f...
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