A preparation method of fault-tolerant nuclear fuel pellets imitating max phase accidents
A technology for nuclear fuel and accidents, which is applied in the field of preparation of fault-tolerant nuclear fuel pellets imitating MAX phase accidents, can solve problems such as the release of fission gas, hidden safety hazards of nuclear power plants, and steep temperature gradients of fuel pellets, and achieve cost reduction and process stability improvement. Effect
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example 1
[0025] (1) Take the following raw materials in mass percentage: 40 μm uranium dioxide 70wt.%, 20 μm silicon 12wt.%, 20 μm graphite powder 12wt.%, zinc stearate 0.1wt.%, 10 μm TiO 2 5.9wt.%; after wet mixing the above powder in ethanol for 24 hours, take out the powder after drying;
[0026] (2) Prepare U by hot pressing sintering process 3 Si 2 C 2 : Put the powder in a graphite mold and vacuumize to 1.0×10 - 3 Pa, the temperature is raised to 1300°C at 20°C / min, and then a pressure of 100MPa is applied and kept for 4 hours to obtain U 3 Si 2 C 2 ;
[0027] (3) Processing and forming: to be U 3 Si 2 C 2 After cooling, it is taken out and processed to the required shape and size, which is the fault-tolerant nuclear fuel pellet imitating the MAX phase.
[0028] U prepared by this method 3 Si 2 C 2 The density is 93.5%.
example 2
[0030] (1) Take the following raw materials in mass percentage: 20μm uranium dioxide 85wt.%, 5μm silicon carbide 7wt.%, 5μm flake graphite 7wt.%, zinc stearate 0.1wt.%, 1μm TiO 2 0.9wt.%; after wet mixing the above powder in ethanol for 12 hours, take out the powder after drying;
[0031] (2) Prepare U by hot pressing sintering process 3 Si 2 C 2 : Put the powder in a graphite mold and vacuumize to 1.1×10 - 3 Pa, the temperature is raised to 1600°C at 5°C / min, and then a pressure of 20MPa is applied and kept for 4 hours to obtain U 3 Si2 C 2 ;
[0032] (3) Processing and forming: to be U 3 Si 2 C 2 After cooling, it is taken out and processed to the required shape and size, which is the fault-tolerant nuclear fuel pellet imitating the MAX phase.
[0033] U prepared by this method 3 Si 2 C 2 The density is 97.3%.
example 3
[0035] (1) Take the following raw materials in mass percentage: 30 μm uranium dioxide 80wt.%, 10 μm silicon carbide 8wt.%, 10 μm carbon black 8wt.%, zinc stearate 0.1wt.%, 5 μm TiO 2 3.9wt.%; after wet mixing the above powder in ethanol for 18 hours, take out the powder after drying;
[0036] (2) Prepare U by hot pressing sintering process 3 Si 2 C 2 : Put the powder in a graphite mold and vacuumize to 0.9×10 - 3 Pa, the temperature is raised to 1450°C at 10°C / min, and then a pressure of 60MPa is applied and kept for 2 hours to obtain U 3 Si 2 C 2 ;
[0037] (3) Processing and forming: to be U 3 Si 2 C 2 After cooling, it is taken out and processed to the required shape and size, which is the fault-tolerant nuclear fuel pellet imitating the MAX phase.
[0038] U prepared by this method 3 Si 2 C 2 The density is 95.1%.
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