Preparation method for layered aluminum-based neutron absorption plate

Abstract

The invention relates to a preparation method for a layered aluminum-based neutron absorption plate. The preparation method aims to meet the protection requirement for neutron radiation shielding in aspent fuel storage grillage of a nuclear power station. According to the technical scheme, aluminum powder, boron carbide powder, copper powder, silicon powder, boric acid and carbon fibers are adopted and taken as raw materials, a compact layered aluminum-based neutron absorption plate is manufactured through powder metallurgy blank making and rolling, the neutron absorption plate is silver white, the neutron absorption rate reaches 99%, the interface between all layers is obvious, all the layers are mutually infiltrated, particles are tightly connected with a base body, the tensile strengthreaches 240 MPa, and the elongation is 7%. According to the preparation method, the process is advanced and reasonable, parameters are accurate and detailed, and the preparation method is an advancedmethod for preparing the layered aluminum-based neutron absorption plate.

Description

technical field [0001] The invention relates to a method for preparing a layered aluminum-based neutron absorbing plate, which belongs to the technical field of nonferrous metal preparation and application. Background technique [0002] Isotope B of boron in boron carbide 10 It has a large neutron absorption cross-section, and is often used as a neutron absorber in neutron-absorbing materials; carbon elements have a high neutron reflection cross-section, adding carbon fibers to metal-based boron carbide can increase the neutron in The number of reflections in metal-based boron carbide, thereby increasing neutron detection by B 10 The probability of element absorption; the metal-based boron carbide neutron absorbing material increases the strength of the material with the increase of the content of boron carbide, but the increase of the content of boron carbide makes the plasticity of the material worse. Mixing carbon fiber in the matrix can increase the material's strength....

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Problems solved by technology

[0003] Boron carbide and carbon fiber are added to the aluminum matrix to make carbon fiber reinforced aluminum matrix boron carbide composite material, which is an excellent neutron absorbing material; however, in the preparation process, due to the special fiber structure of carbon fiber, it is difficult to combine with carbonization Boron powder and aluminum powder are evenly mixed; and due to the requirements of neutron absorption performance, the content of boron carbide in the composite material should be greater than 30%. When high content of boron carbide and carbon fiber are mixed into the metal matrix, it will cause plastic deformation of the metal matrix. Poor, which makes metal matrix composites crack during extrusion and rolling, and it is difficult to prepare large-sized plates, which greatly limits the application of aluminum-based neutron absorbing materials.

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