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Large-dimension B4C-Al neutron absorption plate and preparation method thereof

A neutron absorption plate, large-scale technology, applied in shielding, nuclear engineering, reactors, etc., can solve the problems of increased defects and large energy consumption, and achieve the effect of protecting the edge of the blank

Inactive Publication Date: 2015-02-25
ADVANCED TECHNOLOGY & MATERIALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The first technical problem to be solved by the present invention is that the production of aluminum-based boron carbide neutron absorbing plates in the prior art requires high-temperature sintering by hot isostatic pressing, which consumes a lot of energy and produces many defects in the blank, and is based on the production of large-sized For the purpose of the plate, the existing technology will roll the sintered green body, so that the defects in the material will be further increased; and then a method for preparing a large-size aluminum-based boron carbide neutron absorbing plate with fewer material defects is proposed

Method used

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  • Large-dimension B4C-Al neutron absorption plate and preparation method thereof
  • Large-dimension B4C-Al neutron absorption plate and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0031] (1) Take boron carbide powder with an average Fischer particle size of 30 μm, aluminum powder with an average Fischer particle size of 30 μm, and silicon powder with an average Fischer particle size of 10 μm at a mass ratio of 25:74.4:0.6 to take 10Kg of powder and place it in a three-dimensional In the mixer, the ball-to-material ratio is 3:1, and the mixture is mixed for 6 hours to obtain a mixed powder with a Fischer average particle size of 20 μm; the purity of the boron carbide powder, aluminum powder and silicon powder used are all 99.8%;

[0032] (2) Put the mixed powder into the package to ensure that the relative packing density is 80v%, and vacuumize the package at 200°C to 2×10 -3 Seal after Pa, carry out hot isostatic pressing on the sealed sheath, the pressure is 80MPa, the temperature is 600°C, the time is 20min, the relative density of the blank after hot isostatic pressing is 99% (at 4°C) water density as a reference);

[0033] (3) Remove the sheath on ...

Embodiment 2

[0036](1) Take 10Kg of boron carbide powder with an average Fischer particle size of 50 μm, aluminum powder with an average Fischer particle size of 70 μm, and silicon powder with an average Fischer particle size of 10 μm at a mass ratio of 50:49.4:0.6, and place them in a three-dimensional In the mixer, the ratio of ball to material is 3:1, and the mixed powder with Fischer's average particle size of 40 μm is obtained after mixing for 10 hours; the purity of boron carbide powder, aluminum powder and silicon powder used is 99.9%;

[0037] (2) Put the mixed powder into the package to ensure that the relative packing density is 70v%, and vacuumize the package at 350°C to 1×10 -3 Seal after Pa, heat isostatic pressure treatment on the sealed package, the pressure is 150MPa, the temperature is 400°C, the time is 20min, the relative density of the billet after hot isostatic pressing is 99.1% (in 4°C water The density is a reference);

[0038] (3) Remove the sheath on the outer sid...

Embodiment 3

[0041] (1) Take 10Kg of boron carbide powder with an average Fischer particle size of 0.5 μm, aluminum powder with an average Fischer particle size of 5 μm, and silicon powder with an average Fischer particle size of 10 μm in a mass ratio of 29.4:70:0.6, and place in In the three-dimensional mixer, the ball-to-material ratio is 3:1, and the mixed powder with Fischer's average particle size of 3.5 μm is obtained after mixing for 7 hours; the purity of boron carbide powder, aluminum powder and silicon powder used are all 99.7%;

[0042] (2) Put the mixed powder into the bag to ensure that the relative packing density is 80v%, and vacuumize the bag at 300°C to 2×10 -3 Seal after Pa, heat isostatic pressure on the sealed package, the pressure is 100MPa, the temperature is 500°C, the time is 20min, the relative density of the billet after hot isostatic pressing is 99.2% (in 4°C water The density is a reference);

[0043] (3) Remove the sheath on the outside of the billet, and carr...

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Abstract

A disclosed preparation method for a large-dimension B4C-Al neutron absorption plate comprises: 1) crushing boron carbide powder, aluminium powder and silicon powder and mixing uniformly, so as to obtain a mixed powder with the particle size of 3.5-63 mu m; 2) putting the mixed powder into a can, vacuumizing at 200-350 DEG C, sealing, and then performing heat isostatic pressing processing on the sealed can under the conditions that the pressure is 80-150 MPa, the temperature is 400-600 DEG C and the time is 20 min; 3) removing the can at the outer side of the blank material, performing multiple times of rolling at 450-600 DEG C, controlling the deformation amount of each time rolling to be 10-20%, so as to obtain a plate with the needed thickness; and 4) processing the plate. The invention also discloses the dimension of the B4C-Al neutron absorption plate obtained by using the above method. The prepared B4C-Al neutron absorption plate is applicable to nuclear industry fields such as nuclear reactors, nuclear power stations and the like.

Description

technical field [0001] The present invention relates to a large size B 4 A preparation method of a C-Al neutron absorbing plate and a large-sized neutron absorbing plate prepared by the method belong to the technical field of neutron absorbing materials. Background technique [0002] Nuclear reactors and nuclear facilities need to store and use highly radioactive fuel and spent fuel. The radioactive neutrons in the fuel can easily cause harm to surrounding animals, plants and humans. Therefore, it is necessary to rationally develop and use nuclear energy under the premise of protecting the surrounding ecological environment. A common protective measure is to set up neutron-absorbing materials capable of capturing neutrons around nuclear reactors and nuclear facilities to prevent neutrons from radiating outward. Commonly used neutron absorbing materials include lead-boron polyethylene, boron-containing polypropylene, cadmium plate, boron steel, boron carbide and aluminum-bas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C21/00C22C29/06G21F1/08
Inventor 刘国辉王铁军刘桂荣陈锦王广达李强
Owner ADVANCED TECHNOLOGY & MATERIALS CO LTD
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