A method for manufacturing tungsten or molybdenum-based uranium dioxide fuel pellets
A technology of uranium dioxide and a manufacturing method, which is applied in the field of nuclear fuel preparation, can solve the problems of unimproved continuity of tungsten pellets, poor continuity of tungsten pellets, and high requirements for special equipment, so as to improve the continuity of metal matrix, improve the continuity of tungsten ( Molybdenum) has the effect of good continuity of metal matrix, reducing manufacturing difficulty and cost
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Embodiment 1
[0041] Embodiment 1: the manufacture of tungsten or molybdenum-based uranium dioxide fuel pellets (1)
[0042] Weigh 23g of uranium dioxide powder, pre-press it into a pre-pressed compact under a pressure of 50MPa on a hydraulic press, crush it, pass through a 20-mesh sieve, add 0.6% (m / m) of paraffin, spheroidize and mix evenly, and then add 27g The metal tungsten powder is mixed evenly to obtain powder raw materials that can be used for pressing.
[0043] Weigh 5g of powder raw material, fill it into a cemented carbide mold with a diameter of 12.20mm, apply a pressure of 100MPa to the mold, hold the pressure for 60s, and then demould to obtain a pellet compact.
[0044] Put the pellet compact into a crucible, put it into a sintering furnace, start sintering after vacuuming, the heating rate does not exceed 5°C / min, heat up to 250°C for 3 hours, and maintain a high vacuum in the furnace during the holding process. After the heat preservation is completed, Ar gas containing 2...
Embodiment 2
[0045] Embodiment 2: the manufacture of tungsten or molybdenum-based uranium dioxide fuel pellets (two)
[0046] Weigh 30.86g of uranium dioxide powder, pre-press it into a pre-pressed compact under a pressure of 50 MPa on a hydraulic press, crush it, pass through a 20-mesh sieve, add 0.6% (m / m) of paraffin, spheroidize and mix evenly, and then add 19.14g metal molybdenum powder is mixed evenly, obtains the powder raw material that can be used for pressing.
[0047] Weigh 5g of powder raw material, fill it into a cemented carbide mold with a diameter of 12.20mm, apply a pressure of 400MPa to the mold, hold the pressure for 20s, and demould to obtain a pellet compact.
[0048] Put the pellet compact into a crucible, put it into a sintering furnace, start sintering after vacuuming, the heating rate does not exceed 5°C / min, heat up to 250°C for 3 hours, and maintain a high vacuum in the furnace during the holding process. After the heat preservation is completed, Ar gas containi...
Embodiment 3
[0049] Embodiment 3: the manufacture of tungsten or molybdenum-based uranium dioxide fuel pellets (three)
[0050] Weigh 34.72g of uranium dioxide powder, put it into a crucible, heat up to 100°C in a calciner, and keep it warm in an air atmosphere for 4 hours. The obtained powder is pre-pressed into a pre-pressed compact under a pressure of 50 MPa on a hydraulic press, crushed through a 20-mesh sieve, added 0.3% (m / m) zinc stearate, spheroidized and mixed evenly, and then added 15.28 g of metal The tungsten powder is mixed evenly to obtain a powder raw material that can be used for pressing.
[0051] Weigh 5g of powder raw material, fill it into a cemented carbide mold with a diameter of 12.04mm, apply a pressure of 300MPa to the mold, hold the pressure for 30s, and demould to obtain a pellet compact.
[0052] Put the pellet compact into the crucible, put it into the sintering furnace, start sintering after vacuuming, the heating rate does not exceed 5°C / min, heat up to 600°...
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