Porous B4C ceramic skeleton and freeze-casting process thereof

Abstract

The invention relates to a porous B4C ceramic skeleton and a freeze-casting process thereof. Porous B4C is a ceramic skeleton of B4C / Al serving as a neutron absorption material, and Al is impregnated in the B4C skeleton through an impregnation method, thereby increasing the B4C ceramic content in the B4C / Al structure and improving the neutron absorption capability. The B4C ceramic skeleton for Al impregnation is prepared through the following steps: taking different B4C particles respectively having particle diameters of 5 mu m, 10 mu m, 20 mu m and 40 mu m, selecting water as freeze-casting solvent, mixing according to mass percents, adding a proper amount of dispersing agent and adhesive, freezing, sublimating to obtain a B4C ceramic body, and sintering at 2000 DEG C. The B4C ceramic skeleton provided by the invention is moderate in strength and high in B4C ceramic content, has a favorable through hole structure, and can tolerate pressure produced in the Al impregnation process; the preparation process is simple; and the increase of the B4C content can greatly improve the neutron absorption efficiency of the B4C / Al.

Description

technical field [0001] The invention relates to a B used for neutron absorption of spent fuel 4 Porous B of C / Al composites 4 C The invention discloses a ceramic skeleton preparation process, which belongs to the field of ceramic materials. Background technique [0002] B 4 Because the C / Al composite material contains element B with good neutron absorption performance, it can be used as a structural material for neutron absorption storage. Its advantages are corrosion resistance, radiation resistance, long service life, and can improve the economy and safety of spent fuel storage and transportation. B 4 The commonly used preparation methods of C / Al neutron absorbing materials include casting method, powder metallurgy method, impregnation method and so on. The interfacial reaction of the composite material obtained by the casting method is serious, and the powder metallurgy method has a complicated process, B 4 Low C content, B 4 C is not evenly distributed and other i...

AI Technical Summary

Problems solved by technology

Although there are many reports on the preparation method of porous boron carbide, the preparation of B 4 C Porous ceramic skeleton has not been reported

[0004] At present, although the B produced by infiltration or powder metallurgy 4 C / Al performance is relatively good, but the B contained in it 4 The C content is relatively low, the process cost is high, the operation is complicated, the interface is not easy to control, and the material strength is low. Therefore, researching a better forming method for porous boron carbide ceramics is the key to obtaining high-quality B 4 The important direction of C / Al composite material, the novel porous boron carbide ceramic skeleton forming process that the present invention develops just for this situation

Images