Preparation method of laminated gradient neutron absorbing material

Abstract

The invention relates to a preparation method of a laminated gradient neutron absorbing material. To overcome the defect that plastic deformation of high-content boron carbide and rare earth oxide aluminum alloy-based composite materials is difficult, aluminum alloy is adopted as an outer layer material, the contents of boron carbide and rare earth oxide are gradually increased from the outer layer to the inner layer, a neutron absorbing material blank is prepared through the plasma discharge sintering technology, hot extrusion is carried out through a hydraulic press machine, and the laminated gradient neutron absorbing material is prepared in a hot rolling mode through a rolling mill. According to the preparation method, the process is advanced, data are accurate and detailed, the tensile strength of the prepared neutron absorbing material reaches 240 MPa, the elongation percentage of the prepared neutron absorbing material reaches 6.3%, the corrosion resistance of the prepared neutron absorbing material can be improved by 70%, the prepared neutron absorbing material can be used for nuclear protection, and the preparation method is an advanced method for preparing laminated gradient metal-based composite materials.

Description

technical field [0001] The invention relates to a preparation method of a layered gradient neutron absorbing material, which belongs to the technical field of preparation and application of nonferrous metals. Background technique [0002] Boron and rare earth oxides in boron carbide, such as samarium oxide, europium oxide, and gadolinium oxide, have large neutron absorption cross-sections, and boron carbide and rare earth oxides are cheap, and are often used in nuclear power plants The neutron absorber in the shielding material shields and absorbs neutrons; but because boron carbide and rare earth oxides are difficult to prepare into plates, boron carbide and rare earth oxides are often added to aluminum alloys to prepare aluminum alloy matrix composites. [0003] In the aluminum alloy matrix composite, only when the content of boron carbide and rare earth oxide is higher than the critical value, can the complete shielding and absorption of neutrons be satisfied; when a high...

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Problems solved by technology

[0003] In the aluminum alloy matrix composite, only when the content of boron carbide and rare earth oxide is higher than the critical value, can the complete shielding and absorption of neutrons be satisfied; when a high content of boron carbide and rare earth oxide is added to the interior of the aluminum alloy matrix, due to the carbonization The interface between boron and rare earth oxides and the aluminum alloy matrix has poor wettability and low interfacial bonding strength, which leads to cracking of composite materials during plastic deformation such as extrusion and rolling, making it difficult to prepare high-content boron carbide and rare earth oxides aluminum alloy matrix composites

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