A kind of preparation method of aluminum-based boron carbide neutron absorbing plate

Abstract

The invention relates to a method for preparing an aluminum-based boron carbide neutron absorption board. According to a requirement on nuclear device protection, the compact aluminum-based boron carbide neutron absorption board is formed by mixing aluminum powder, boron carbide powder, silicon powder, titanium powder and boracic acid crystal, performing powder metallurgy to make a rectangular board, and performing hot extrusion molding on the rectangular board on a pressing machine in a die in a heating state; the compound neutron absorption board is grey white; the neutron absorption rate is more than or equal to 90 percent, the boron carbide is distributed uniformly, and particles and a base body are tightly combined together; the micro hardness of the base body is up to 185.8HV and the micro hardness of the particles is up to 2,022.2HV; a corrosion resistance level on the surface of the board is -0.45 voltage, the anti-bending angle is more than or equal to 10 degrees, the tensilestrength is more than or equal to 200 MPa, the fracture elongation rate is 1.8 percent and the fracture contractibility rate is more than or equal to 1.0 percent. The preparation method is advanced and rational in process, and is full and accurate in parameter; and the preparation method is an ideal method for preparing the aluminum-based boron carbide neutron absorption board.

Description

technical field [0001] The invention relates to a method for preparing an aluminum-based boron carbide neutron absorbing plate, which belongs to the technical field of nonferrous metal powder metallurgy and plate forming and strengthening methods. Background technique [0002] In nuclear installations, in order to prevent nuclear radiation, neutron materials and technologies are often used for shielding protection. [0003] At present, the commonly used neutron absorbing materials are lead-boron polyethylene and boron-containing polypropylene, which have the advantages of simple shielding structure, light weight and small size of the shielding body, but lead-boron polyethylene is easy to age and has a short life, which limits its application; Cadmium plates can also be used as neutron absorbing materials, but cadmium is toxic and carcinogenic; boron steel can also be used as neutron absorbing materials, but the boron content of boron steel is too low to meet the shielding ne...

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Problems solved by technology

[0003] The neutron-absorbing materials commonly used at present are lead-boron polyethylene and boron-containing polypropylene, which have the advantages of simple shielding structure, light weight and small size of the shielding body, but lead-boron polyethylene is easy to age and has a short life, which limits its application; Cadmium plates can also be used as neutron absorbing materials, but cadmium is toxic and carcinogenic; boron steel can also be used as neutron absorbing materials, but the boron content of boron steel is too low to meet the shielding needs

[0004] Boron carbide B 4 C has high neutron absorption capacity, high thermal neutron capture cross-section, wide capture energy spectrum, no radioactive isotopes, low secondary ray energy, corrosion resistance, and good thermal stability. It is often used in carbonization of nuclear power plant exterior walls The boron sintered mosaic can absorb neutrons, but boron carbide has poor toughness and high brittleness, so it is difficult to make a neutron absorbing material with integrated structure and function

[0005] Metal aluminum has good toughness, light material, easy ductility, corrosion resistance, and strong plasticity. Using metal aluminum or aluminum alloy as a carrier and boron carbide as a neutron absorber to make a metal-based neutron absorbing material can improve The toughness of the material can guarantee the neutron absorption performance, but it contains B 4 The preparation and sheet forming technology of Al-based composite materials with higher C are still under discussion.

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