Preparation method and application of uranium-based ternary carbide
A ternary carbide and carbide technology, applied in the direction of reactor fuel material, nuclear power generation, climate sustainability, etc., can solve the problems affecting the stability of UC pellets, insufficient oxidation resistance, and swelling of uranium carbide irradiation, etc. Achieve the effect of improving antioxidant performance, enhancing lattice stability, and reducing reaction
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[0023] A method for preparing uranium-based ternary carbides is prepared by reaction sintering of uranium compounds and transition metal carbides. Specifically include the following steps:
[0024] Step A, preparation of raw materials: the sum of the total mass percentages of the raw materials is calculated as 100%, including the following components: 10-89.9wt.% uranide powder, 10-89.9wt.% transition metal carbide powder, 0-11.4% carbon powder, and lubricant 0.1wt.% Ake wax,
[0025] Put the above components in a nylon ball mill jar, based on the total mass of the above components, add 1-2 times the total mass of alcohol and 3 times the total mass of zirconia grinding balls, and wet mix the balls for 24 hours, Afterwards, dry at 70-100°C for 24 hours and sieve to obtain the raw material;
[0026] Step B, placing the raw material obtained in step A in a designed sintering mold for reaction sintering to obtain a highly stable uranium-based ternary carbide.
[0027] In the ab...
Embodiment 1
[0035] Step A, proportioning raw materials as follows:
[0036] Uranium carbide, 5 μm, 235U enrichment 2%, 10wt.%; ZrC, 40 μm, 89.9wt.%; Acrawax, 0.1wt.%. Put the above powder in a nylon ball mill jar, add 1 times the mass of alcohol and 3 times the mass of zirconia grinding balls, wet mix and grind the balls for 24 hours, then dry at 70°C for 24 hours and sieve.
[0037] Step B, carry out sintering as follows:
[0038] The mixed powder is placed in a hot pressing sintering mold for reaction sintering. First evacuate to 5×10 -2 Pa, raised to 600°C at a rate of 20°C / min and held for 0.5h for degreasing; then filled with argon to 10kPa, raised to 1900°C at a rate of 5°C / min and held for 4h, while applying a sintering pressure of 100MPa, holding After the pressure holding is completed, the furnace is cooled.
[0039] Step C, take out the sample after cooling with the furnace, and process it to the required shape and size.
Embodiment 2
[0041] Step A, proportioning raw materials as follows:
[0042] Uranium carbide, 40μm, 235 U enrichment 20%, 89.9wt.%; NbC, 5μm, 10wt.%; Acrawax, 0.1wt.%. Put the above powder in a nylon ball mill jar, add 2 times the mass of alcohol and 3 times the mass of zirconia grinding balls, wet mix and grind the balls for 24 hours, then dry at 100°C for 24 hours and sieve.
[0043] Step B, carry out sintering as follows:
[0044] The mixed powder is placed in a hot pressing sintering mold for reaction sintering. First evacuate to 5×10 -1 Pa, raised to 600°C at a rate of 5°C / min and held for 2 hours for degreasing; then filled with argon to 50kPa, raised to 2100°C at a rate of 10°C / min and held for 1 hour, and a sintering pressure of 20MPa was applied at the same time. After pressing, the furnace is cooled.
[0045] Step C, take out the sample after cooling with the furnace, and process it to the required shape and size.
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