A method for preparing high-safety uranium dioxide nuclear fuel pellets
A uranium dioxide, high-safety technology, applied in the field of preparation of high-safety uranium dioxide nuclear fuel pellets, can solve the problems of limited and slow grain growth
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[0023] The method for preparing high-safety uranium dioxide nuclear fuel pellets in this embodiment mainly includes two steps, one is the preparation of core-shell structure particles, and the other is the preparation of nuclear fuel pellets.
[0024] Specifically, step one utilizes the powder metallurgy mold to UO 2 The powder is cold-pressed, and then granulated and spheroidized to obtain UO 2 pellets, and then mixed with grain growth additive micropowder (Al 2 o 3 \Y 2 o 3 、Al 2 o 3 \SiO 2 、Cr 2 o 3 , Cr, etc.) and enhanced phase powder (C f , Graphene, ZrC, SiC w 、SiC f 、SiC p etc.) by physical mixing, the grain growth aid and the reinforcing phase are coated on the UO 2 On the surface of the sphere, core-shell structure particles are obtained, and the specific operation is as follows:
[0025] (1) UO with a particle size of 20nm to 500μm 2 The powder is loaded into a powder metallurgy preforming mold for biaxial compression molding to obtain a density of 5....
example 1
[0034] UO with a particle size of 20nm 2 The powder is loaded into a powder metallurgy preforming mold for biaxial compression molding to obtain a density of 5.5g / cm 3 UO 2 preform; the UO 2 The preform is crushed and sieved to obtain UO with a particle size of 50 mesh 2 particles; then the UO 2 Put the particles into the spheroidization equipment for grinding and spheroidization for 8 hours to obtain UO with good sphericity 2 small ball; the UO 2 Put the pellets into the mixing coating equipment, add 20vol.% grain growth aid Al with a particle size of 100μm 2 o 3 \Y 2 o 3 , where Al 2 o 3 and Y 2 o 3 The mass ratio is 1:1, and 3.5vol.% reinforcement phase C with a particle size of 50μm f ,, mixed and coated for 2 hours to obtain the reinforced phase C f Al 2 o 3 \Y 2 o 3 at UO 2 The surface of the sphere is coated with uniform core-shell structure particle UO 2 @Al 2 o 3 \Y 2 o 3 -C f ;
[0035] Will UO 2 @Al 2 o 3 \Y 2 o 3 -C f The core-shell ...
example 2
[0037] UO with a particle size of 100nm 2 The powder is loaded into a powder metallurgy preforming mold for biaxial compression molding to obtain a density of 5.0g / cm 3 UO 2 preform; the UO 2 The preform is crushed and sieved to obtain UO with a particle size of 10 mesh 2 particles; then the UO 2 Put the particles into the spheroidization equipment for grinding and spheroidization for 2 hours to obtain UO with good sphericity 2 small ball; the UO 2 Put the balls into the mixing coating equipment, add 30vol.% grain growth aid Al with a particle size of 300μm 2 o 3 \SiO 2 , where Al 2 o 3 and SiO 2 The mass ratio is 1:1, and 5vol.% of the reinforcement phase Graphene with a particle size of 100 μm is mixed and coated for 0.5 hours to obtain the reinforcement phase Graphene and the grain growth aid Al 2 o 3 \SiO 2 at UO 2 The surface of the sphere is coated with uniform core-shell structure particle UO 2 @Al 2 o 3 \SiO 2 -Graphene;
[0038] Will UO 2 @Al 2 o ...
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