Burnable neutron absorbers

Details Burnable neutron absorbers Burnable neutron absorbers

G - Physics

21

F

31/103, 25/123

G21F 1/06 (2006.01) C04B 35/111 (2006.01) G21C 21/18 (2006.01)

Patent

CA 1188501

18 ABSTRACT OF THE DISCLOSURE Annular pellets of burnable poison specifically boron carbide, B4C, in a matrix of a refractory material, specifically aluminum oxide, Al2O3, are produced. The pellets are of small wall thickness. Powders of the Al2O3 and the B4C are milled in a ball mill in water in which a wetting agent, a surfactant and a deflocculant are included to produce a slurry. Organic binders and plasticizers are added. Then the slurry is spray dried in a centrifugal separator. The resulting powder is poured into a mold and a tubular green body is formed by isostatic pressure. The tube may be sintered to size as a whole and then cut into lengths; i.e., pellets, or the green body may be cut into green-body pellets which are then sintered.

420150

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