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Preparation method of high density boral metal matrix composite material

A technology of boron carbide aluminum and composite materials, which is applied in the field of preparing high-density metal matrix composite material B4C-Al neutron absorbing plate by billet rolling method, which can solve the problems of non-preparation and achieve excellent performance and simple process.

Active Publication Date: 2015-02-11
NUCLEAR POWER INSTITUTE OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] For example, the Chinese patent application number 200910263588.9 is a powder metallurgy pressure processing method, which describes "a spent fuel storage using B 4 The preparation method of C-Al neutron absorbing plate", the method is to install the compact in the aluminum alloy box for rolling, and during the rolling process, the billet and the aluminum alloy box are metallurgically combined to form a B 4 C is uniformly dispersed in the aluminum alloy matrix and is covered with an aluminum alloy cladding, which is a sandwich structure composite material, that is, this method can only prepare B 4 C is evenly dispersed in the Al alloy matrix, which is a sandwich biscuit-like material with an aluminum alloy cladding, but it is impossible to prepare a high-density boron carbide aluminum metal matrix composite material without an aluminum alloy cladding and better performance.

Method used

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preparation example Construction

[0016] The preparation method of the present invention is to mix B according to a predetermined ratio 4 C powder and Al alloy powder are uniformly mixed in the mixer; the uniformly mixed B 4 C aluminum alloy powder is pressed into a core blank with a certain density; then the pressed core blank is installed in a pre-prepared aluminum alloy frame and placed in a vacuum sintering furnace for vacuum sintering; after sintering, it is hot-rolled, and the core blank reaches After reaching a certain density, carry out 90° reverse rolling to obtain a hot-rolled sheet, and then cold-roll the hot-rolled sheet, and straighten it after annealing to obtain a sheet with a predetermined density.

[0017] Specific steps are as follows:

[0018] Step 1 mixing: B 4 C powder and Al alloy powder with a mass fraction of 35-90wt% and a particle size of 10-20 μm are uniformly mixed in a mixer;

[0019] Step 2 core blank pressing: mix the uniform B 4 C aluminum alloy powder, pressed into a core b...

Embodiment 1

[0025] Step 1 Mixing: B with mass fraction 10wt% and average particle size 20μm 4 C powder and Al alloy powder with a mass fraction of 90wt% and an average particle size of 10 μm are uniformly mixed in a mixer;

[0026] Step 2 core blank pressing: mix the uniform B 4 C aluminum alloy powder is pressed into a core blank, and the density of the core blank is 70%;

[0027] Step 3 Core billet sintering: Put the pressed core billet into the aluminum alloy frame and put it in a vacuum sintering furnace for vacuum sintering, keeping the vacuum degree in the vacuum sintering furnace at 10 -2 Pa, the sintering temperature is 400°C, and the sintering time is 18 hours;

[0028] Step 4 Hot rolling into plates: Hot rolling the sintered core blank at a temperature of 400°C, the deformation of the core blank rolling pass is 20%, and when the core blank density reaches 80%TD, carry out 90° reverse rolling system to obtain a plate with a predetermined thickness and size;

[0029] Step 5 Co...

Embodiment 2

[0035] Step 1 Mixing: B with mass fraction 30wt% and average particle size 40μm 4 C powder and Al alloy powder with a mass fraction of 70wt% and an average particle size of 20 μm are uniformly mixed in a mixer;

[0036] Step 2 Core billet pressing: Press the uniformly mixed aluminum alloy powder into a core billet with a density of 80%;

[0037] Step 3 Core billet sintering: Put the pressed core billet into the aluminum alloy frame and put it in a vacuum sintering furnace for vacuum sintering, keeping the vacuum degree in the vacuum sintering furnace at 10 -3 Pa, the sintering temperature is 470°C, and the sintering time is 10 hours;

[0038] Step 4 Hot rolling into plates: hot rolling the sintered core billet at a temperature of 500 ° C, the deformation of the core billet rolling pass is 35%, and when the core billet density reaches 85% TD, carry out 90° reverse rolling , to obtain a plate with a predetermined thickness;

[0039] Step 5 Cold rolling and straightening: cold...

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PUM

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Abstract

The invention provides a preparation method of a high density boral metal matrix composite material. The method comprises the following steps of: mixing B4C powder and Al alloy powder according to the predetermined chemical proportion, and uniformly dispersing the B4C particles in the Al alloy matrix; pressing the mixture into a core blank with density of 70-95% TD to form a core blank of homogeneous blank; and sintering the core blank in an aluminum alloy frame, and carrying out hot rolling on the sintered core blank; carrying out 90-degree reversing rolling when the density of the core blank reaches 70-95% TD; and then carrying out cold roll straightening. Compared with the prior art, the preparation method provided by the invention has a simple technological process; the high density composite material formed by uniformly dispersing the B4C powder in the aluminum matrix has better property, wherein the content of B4C is as high as 65% by weight; and the high density boral metal matrix composite material can be used as a neutron absorption material for critical safety control of a spent fuel transportation and storage system, and the intensive storage of the spent fuel is realized.

Description

technical field [0001] The invention belongs to a preparation process of a composite material, in particular to the preparation of a high-density metal matrix composite material B by billet rolling 4 C-Al method for neutron absorbing panels. 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 boron 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, and long service life. As a spent fuel neutron absorbing material, it can improve the economy and safety of spent fuel storage and transportation. [0003] The boron carbide content can be as high as 65wt%. According to the design requirements, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22C21/00C22C32/00
Inventor 孙长龙刘云明刘晓珍
Owner NUCLEAR POWER INSTITUTE OF CHINA