Preparation method of high-temperature structure and function integrated B4C (boron carbide)-enhanced Al (aluminum)-based neutron absorbing material

An absorbing material and reinforced aluminum-based technology, which is applied in the field of preparation of high-temperature structure-functional integrated boron carbide reinforced aluminum-based neutron absorbing materials, can solve the problems of difficult processing, high temperature resistance, poor plasticity, etc., and achieve moderate bulk density , Good sinterability and good plasticity

Active Publication Date: 2018-06-08
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing a high-temperature structure-functional integrated neutron absorbing material. The prepared neutron absorbing material has good strong-plastic matching and is easy to be processed plastically, which solves the problem of existing B 4 C / Al material is not resistant to high temperature, or high temperature resistant B 4 C / Al has poor plasticity and is difficult to process. It is suitable for dry storage and transportation of spent fuel and can be used for large-scale industrial production.

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  • Preparation method of high-temperature structure and function integrated B4C (boron carbide)-enhanced Al (aluminum)-based neutron absorbing material
  • Preparation method of high-temperature structure and function integrated B4C (boron carbide)-enhanced Al (aluminum)-based neutron absorbing material
  • Preparation method of high-temperature structure and function integrated B4C (boron carbide)-enhanced Al (aluminum)-based neutron absorbing material

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preparation example Construction

[0029] The present invention is a method for preparing a boron carbide-reinforced aluminum-based neutron-absorbing material with integrated high-temperature structure and function. The preparation method includes the following steps:

[0030] (1) Pre-oxidize the ultra-fine aluminum powder in a furnace containing an oxygen atmosphere, so that the original alumina on the surface will crack due to the difference in thermal expansion coefficient from the substrate when heated, and a new aluminum oxide film will be formed on the exposed surface of the fresh aluminum powder , increase the alumina content;

[0031] (2) Mix the oxidized ultra-fine aluminum powder and boron carbide particles uniformly by mechanical mixing or ball milling, and the surface of the oxidized aluminum powder after step (1) becomes rough, which can reduce the adhesion and knot between the aluminum powders during the mixing process piece;

[0032] (3) Sinter the uniformly mixed powder by pressing and molding ...

Embodiment 1

[0037] Spherical aluminum powder with an average particle size of 2.5 μm was selected and placed in an air furnace at 400°C for 2 hours for pre-oxidation and then cooled in the furnace. After the pre-oxidation treatment, the original alumina on the surface of the aluminum powder is cracked or even separated from the matrix, and a new alumina film is formed on the exposed surface of the fresh aluminum powder (such as Figure 5 ). The pre-oxidized aluminum powder and 10wt% content of B with an average particle size of 6.5 μm 4C granules were mechanically mixed using a V-type mixer, and the mixing time was 8 hours. The mixed powder is cold-pressed at 200MPa, then put into an air furnace for sintering at 600°C for 1 hour, and the sintered ingot is hot-extruded at 450°C to form a strip, with an extrusion ratio of 16:1. The extruded strip was annealed at 450°C for 8 hours to obtain the final profile.

[0038] After the sintered ingot is thermally processed, the shell-like "skelet...

Embodiment 2

[0053] Spherical aluminum powder with an average particle size of 1.5 μm was selected and placed in an air furnace at 400°C for 2 hours for pre-oxidation and then cooled in the furnace. The pre-oxidized aluminum powder and 10wt% content of B with an average particle size of 6.5 μm 4 C granules were mechanically mixed using a V-type mixer, and the mixing time was 8 hours. The mixed powder was cold-pressed at 200MPa, then put into an air furnace at 530°C for sintering for 2 hours, and the sintered ingot was hot-extruded at 450°C to form a strip plate, with an extrusion ratio of 16:1. The extruded strip was annealed at 450°C for 8 hours to obtain the final profile.

[0054] The high-temperature structure-functional integration B manufactured by this embodiment 4 Mechanical properties of C / Al neutron absorbing material at room temperature: yield strength 224MPa, tensile strength 246MPa, elongation 8%. The yield strength at 375°C is 101MPa, the tensile strength is 130MPa, and th...

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Abstract

The invention discloses a preparation method of a high-temperature structure and function integrated B4C (boron carbide)-enhanced Al (aluminum)-based neutron absorbing material, and belongs to the technical field of neutron absorbing materials and Al-based composite materials. The preparation method comprises the following steps of (1) pre-oxidizing the surface of superfine aluminum powder to increase the content of aluminum oxide; (2) uniformly mixing the superfine aluminum powder and micrometer-level B4C particles; (3) performing compression moulding on the powder, and sintering a pressed compact; (4) forging the sintered billet, extruding or rolling, so as to obtain a high-temperature structure and function integrated B4C/Al neutron absorbing profile or sheet. The preparation method hasthe advantages that in the final material, the aluminum oxide is distributed into crystal interfaces of material, and the pining is performed, so as to obviously enhance the high-temperature propertyof the material; by adding the B4C particles, the room-temperature and medium-temperature strengths can be further improved, and the neutron absorbing function is realized; the technology is simple and convenient and is easy to implement; the strength of the material at the room temperature to high temperature are higher than the actual use requirements, and the material can be applied to the storage and transportation of the spent fuel.

Description

technical field [0001] The invention relates to the technical field of neutron-absorbing materials and aluminum-based composite materials, in particular to a method for preparing a high-temperature structure-function integrated boron carbide reinforced aluminum-based neutron-absorbing material. Background technique [0002] The used nuclear fuel is called spent fuel, which has high radioactivity. The safe development of nuclear power requires reliable storage technology for spent fuel. During the transportation and storage of spent fuel, neutron absorbing materials are required for shielding protection. The current storage method is to use neutron absorbing materials to maintain the subcritical state of spent fuel in conjunction with structural materials, usually B 4 The C / Al neutron absorbing material is placed in the interlayer of stainless steel plates. Due to the poor thermal conductivity of stainless steel, it is not conducive to the heat dissipation of the spent fuel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C21/00C22C32/00G21C19/40
CPCC22C1/05C22C21/00C22C32/0057G21C19/40Y02E30/30
Inventor 马宗义王全兆肖伯律昝宇宁王文广
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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