Neutron absorption ball
A technology for absorbing balls and neutrons, applied in the field of nuclear reactors, to achieve the effects of low price, easy cracking and discharge, and improved green body strength and mechanical strength
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Embodiment 1
[0028] Take by weighing 60Kg of natural graphite, 15Kg of carbon black, and 25Kg of boron carbide as powder. A mixed aqueous solution of PVA and PEG is prepared, the concentration of the mixed aqueous solution is 2 wt %, and the mass ratio of PVA:PEG is 3:2. Add the weighed powder into the mixed aqueous solution with a mass ratio of 1:3, stir for 2 hours, and mix well. The resulting slurry was subjected to spray granulation at a granulation temperature of 300° C. to obtain a granulated powder of 800 microns. Put the granulated powder into a rubber sheath and carry out isostatic pressing molding with a molding pressure of 250 MPa and a holding time of 10 minutes to obtain a boron carbide-containing graphite ball green body with a diameter of about 6.5 mm. Carbonize the boron carbide-containing graphite ball green body under the protection of nitrogen, raise the temperature to 800°C at a rate of 3°C per minute, keep it warm for 4 hours, and then cool down naturally. Grinding t...
Embodiment 2
[0030] Weigh 55Kg of natural graphite, 20Kg of carbon black, and 25Kg of boron carbide. A mixed aqueous solution of PVA and PEG is prepared, the concentration of the mixed aqueous solution is 2 wt %, and the mass ratio of PVA:PEG is 3:1. Add the weighed powder into the mixed aqueous solution with a mass ratio of 1:3, stir for 2 hours, and mix well. The resulting slurry was subjected to spray granulation at a granulation temperature of 300° C. to obtain a granulated powder of 800 microns. Put the granulated powder into a rubber sheath and carry out isostatic pressing molding with a molding pressure of 250 MPa and a holding time of 10 minutes to obtain a boron carbide-containing graphite ball green body with a diameter of about 6.5 mm. Carbonize the graphite ball body containing boron carbide under the protection of nitrogen, raise the temperature from 4°C to 850°C per minute, keep it warm for 4 hours, and cool down naturally. Grinding the obtained graphite balls improves the ...
Embodiment 3
[0032] Weigh 70Kg of natural graphite, 20Kg of carbon black, and 10Kg of boron carbide. A mixed aqueous solution of PVA and PEG is prepared, the concentration of the mixed aqueous solution is 2 wt %, and the mass ratio of PVA:PEG is 3:2. Add the weighed powder into the mixed aqueous solution with a mass ratio of 1:3, stir for 2 hours, and mix well. The resulting slurry was subjected to spray granulation at a granulation temperature of 300° C. to obtain a granulated powder of 800 microns. Put the granulated powder into a rubber sheath and carry out isostatic pressing molding with a molding pressure of 250 MPa and a holding time of 10 minutes to obtain a boron carbide-containing graphite ball body with a diameter of about 10.5 mm. Carbonize the boron carbide-containing graphite ball green body under the protection of nitrogen, raise the temperature to 900°C at a rate of 3°C per minute, keep it warm for 4.5 hours, and cool down naturally. Grinding the obtained graphite balls im...
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