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Preparation method of high-density B4C-Al homogeneous neutron absorber material

An absorbing material and high-density technology, applied in metal rolling and other directions, can solve problems such as inability to manufacture, and achieve the effects of stable performance, simple process, and high density

Active Publication Date: 2014-12-10
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the Chinese patent with application number 201010602530.5 describes "a method for preparing a high-density neutron absorbing plate". The method is to roll the mixed powder in an aluminum alloy box. During the rolling process, the mixed powder is gradually dense And achieve metallurgical bonding with the aluminum alloy shell to form a sandwich biscuit-style metallurgically bonded material. There is no process of removing the aluminum alloy shell during the rolling process, so B cannot be prepared 4 A homogeneous material formed by uniform dispersion of C in the aluminum alloy matrix

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Step 1 Mixing: B with a mass fraction of 10% and an average particle size of 10 μm 4 C powder, the mass fraction is 90%, and the Al matrix powder with an average particle size of 40 μm is mixed uniformly in a mixer;

[0025] Step 2 Loading: Put the mixed powder into an aluminum alloy box with an aluminum alloy frame for packaging;

[0026] Step 3 Vacuum degassing and sintering: Put the aluminum alloy box with the mixed powder blank in a vacuum of 10 -3 Vacuum degassing and sintering in a Pa vacuum furnace; the sintering temperature is 510°C, and the sintering time is 10 hours;

[0027] Step 4 Hot rolling and peeling: The sintered aluminum alloy box is continuously hot-rolled at 350°C for multiple passes, the reduction is 10% per pass, and when the density of the billet is 70% TD, the direction is changed to 90 Rolling, and removing the aluminum alloy cladding on the outer layer of the billet, and then performing multi-pass hot rolling, with a reduction of 40%, and rol...

Embodiment 2

[0032] Step 1 Mixing: B with a mass fraction of 26% and an average particle size of 35 μm 4 C powder, Al matrix powder with a mass fraction of 74% and an average particle size of 60 μm is mixed uniformly in a mixer;

[0033] Step 2 charging: with embodiment 1;

[0034] Step 3 Vacuum degassing and sintering: Put the aluminum alloy box with the mixed powder blank in a vacuum of 10 -3 Vacuum degassing and sintering in a Pa vacuum furnace; the sintering temperature is 540°C, and the sintering time is 6 hours;

[0035] Step 4 Hot rolling and peeling: The sintered aluminum alloy box is subjected to continuous multi-pass hot rolling at 450°C, the reduction is 10% per pass, and when the density of the billet is 85% TD, the direction is changed to 90° Rolling, and removing the aluminum alloy cladding on the outer layer of the billet, and then performing multi-pass hot rolling, with a reduction of 35%, and rolling to a plate with a thickness of 2.5mm;

[0036] Step 5 Annealing treatm...

Embodiment 3

[0040] Step 1 Mixing: B with a mass fraction of 35% and an average particle size of 25 μm 4 C powder, the Al matrix powder with a mass fraction of 65% and an average particle size of 45 μm is uniformly mixed in a mixer;

[0041] Step 2 charging: with embodiment 1;

[0042] Step 3 Vacuum degassing and sintering: Put the aluminum alloy box with the mixed powder blank in a vacuum of 10 -3 Vacuum degassing and sintering in a Pa vacuum furnace; the sintering temperature is 480°C, and the sintering time is 15 hours;

[0043] Step 4 Hot rolling and peeling: The sintered aluminum alloy box is continuously hot-rolled at 540 °C for multiple passes, and the reduction is 10% per pass. When the density of the billet is 90% TD, the outer layer of the billet is removed. For the aluminum alloy cladding, when the density of the billet is 95% TD, the rolling is reversed at 90°, and then hot-rolled for multiple passes, with a reduction of 30%, and rolled to a plate with a thickness of 2.0mm; ...

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Abstract

The invention discloses a preparation method of a high-density B4C-Al homogeneous neutron absorber material. The method comprises the following steps of: uniformly mixing B4C and Al alloy powder according to a preset chemical proportion; putting into an aluminium alloy box with an aluminium alloy frame; vacuum sintering; hot rolling; rolling through inverting at 90 degrees when the density of billets reaches 70 percent-95 percent TD; removing an aluminium alloy jacket on outer layers of the billets; rolling to be preset size; and annealing to obtain the neutron absorber material with the density being above 98 percent. The preparation method has a simple process and low requirement on equipment. The prepared B4C-Al neutron absorber material is a homogeneous material, has high density and stable use performances, and can be used as the neutron absorber material for critical safety control in spent fuel storage facilities.

Description

technical field [0001] The invention belongs to a method for preparing composite materials, in particular to the preparation of high-density homogeneous B 4 The preparation method of C-Al neutron absorbing material. Background technique [0002] The boron carbide aluminum metal matrix composite material plate is composed of boron carbide uniformly dispersed in the aluminum alloy matrix, wherein the boron carbide is the dispersion strengthening phase, and the aluminum alloy is the matrix phase. This material contains B element with good neutron absorbing properties and can be used as a neutron absorbing material. Its notable advantages are corrosion resistance, radiation resistance, high boron content, long service life, and can improve the economy and safety of spent fuel storage and transportation. [0003] B 4 C-A1 neutron-absorbing materials, foreign preparation methods include melting casting, powder metallurgy and other methods, each method has its own characteristic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22F1/04B21B3/00
Inventor 刘晓珍刘云明孙长龙
Owner NUCLEAR POWER INSTITUTE OF CHINA