CN103614606A

CN103614606A - Aluminium matrix composite with high B4C content

Info

Publication number: CN103614606A
Application number: CN201310549888.XA
Authority: CN
Inventors: 严玉; 郑家青; 戴金华
Original assignee: Hailong Nuclear Material Technology (jiangsu) Co Ltd
Current assignee: Hailong Nuclear Material Technology (jiangsu) Co Ltd
Priority date: 2013-11-07
Filing date: 2013-11-07
Publication date: 2014-03-05

Abstract

The invention discloses an aluminium matrix composite with high B4C content. The aluminium matrix composite comprises Al alloy powder with the particle size of 35-60 micrometers and B4C powder with the particle size of 10-60 micrometers, wherein the ratio of the Al alloy powder to the B4C powder with the particle size of 10-60 micrometers is (90-35%): (10-65%) according to the mass percentage. A preparation method of the aluminium matrix composite is simple in technological process and has low requirements on equipment; the prepared B4C-Al neutron absorption material is a homogeneous material and high in B4C content, has stable usability and can serve as a neutron absorption material for critical security control in spent fuel storage facilities.

Description

A kind of high B 4c content aluminum matrix composite

Technical field

The invention belongs to a kind of preparation method of matrix material, be specifically related to pine dress powder framework peeling hot rolling legal system for high B ₄the preparation method of C content aluminum matrix composite.

Background technology

Boral metal matrix composite sheet is to be composited in alloy matrix aluminum by norbide even dispersion, and wherein norbide is dispersion-strengthened phase, and aluminium alloy is matrix phase.This material contains the well behaved B element of neutron-absorbing, can be used as neutron absorber material.Its remarkable advantage is that corrosion-resistant, resistance to irradiation, boron content are high, long service life, can improve economy and the security of spent fuel storing.

High B ₄c content aluminum matrix composite, external preparation method has the several different methods such as fusion casting, powder metallurgy, and the whole bag of tricks has the feature of himself, and the reaction of fusion casting material interface is serious, and powder metallurgic method preparation technique process is complicated.And the method that powder metallurgy, press working combine can be improved the distributing homogeneity of norbide greatly.As the application number Chinese patent that is 201010602530.5, " a kind of preparation method of high-density neutron absorbing plate " described, the method is that mixed powder is contained in to rolling in aluminium alloy box, in the operation of rolling, mixed powder is closely knit and reach metallurgical binding with aluminum alloy casing gradually, form a kind of material of metallurgical binding everywhere of Sandwich biscuit type, the operation of aluminium alloy involucrum not being removed in the operation of rolling, so can not prepare B ₄the homogeneous material that C even dispersion forms in alloy matrix aluminum.

Summary of the invention

The object of the present invention is to provide the simple high-density B of a kind of preparation technology ₄the preparation method of C-Al homogeneous neutron absorber material.

Technical scheme of the present invention is as follows:

A kind of high B ₄c content aluminum matrix composite, is characterized in that: the Al alloy powder and the granularity that by granularity, are 35～60 μ m are the B of 10～60 μ m ₄c powder forms, and Al alloy powder and granularity are the B of 10～60 μ m ₄the ratio of C powder is for being 90～35%:10～65%, by mass percentage.

Effect of the present invention is: compared with prior art, preparation method of the present invention does not need large-scale press and extrusion machine, and technique is relatively simple, and equipment requirements is not high, the B of preparation ₄c-Al neutron absorber material is homogeneous material, has density high, and use properties is stable, and density of material reaches more than 98%, can be used as the neutron absorber material of controlling as criticality safety in irradiated fuel store facility, realizes the intensive storage of spent fuel.

Embodiment

Preparation method of the present invention is: according to predetermined chemical proportioning by B ₄after C and Al powdered alloy mix, after inserting the aluminium alloy box with aluminum alloy frame, encapsulate, carry out vacuum stripping sintering, to remove moisture in mixed powder, make to occur between powder particle certain sintering adhesive bonding, be conducive to follow-up combination, and then the box after sintering is carried out to hot rolling, when the density of blank reaches 70%-95%TD, carry out 90 ° of commutation rollings solid to ensure even density material structure, and adopt mechanical means to remove the outer field aluminium alloy involucrum of blank, carry out again the hot rolling of multi-pass, make material progressively after fine and close metallurgical binding, be rolled to the sheet material of pre-determined thickness, make more than panel density reaches 98%TD.Wherein, the process sequence that commutates 90 ° of rollings and remove involucrum can freely be selected, and both can carry out during in different density at blank, also can in identical density, carry out at material, as long as blank density reaches 70～95%TD.

Embodiment 1

Step 1 batch mixing: by the B of massfraction 10%, mean particle size 10 μ m ₄c powder, massfraction 90%, the Al matrix powder of mean particle size 40 μ m mixes in mixer;

Step 2 charging: powder mix is inserted in the aluminium alloy box with aluminum alloy frame and encapsulated;

Step 3 vacuum stripping sintering: will be packaged with the aluminium alloy box of powder mix blank, being put into vacuum tightness is 10 ^-3in the vacuum oven of Pa, carry out vacuum stripping sintering; 510 ℃ of sintering temperatures, sintering time is 10 hours;

Step 4 hot rolling peeling: the aluminium alloy box after sintering is carried out to continuous multiple tracks hot rolling at 350 ℃, draught be every time 10%, when the density of blank is 70%TD, the rolling of 90 ° commutates, and remove the outer field aluminium alloy involucrum of blank, carry out multi-pass hot rolling, draught is 40% again, is rolled to the sheet material of thickness 2.7mm;

Step 5 anneal: the sheet material after hot rolling is carried out to anneal, make density and be 98.5% neutron-absorbing material.

Embodiment 2

Step 1 batch mixing: by the B of massfraction 26%, mean particle size 35 μ m ₄c powder, massfraction 74%, mean particle size are that the Al matrix powder of 60 μ m mixes in mixer;

Step 2 charging: with embodiment 1;

Step 3 vacuum stripping sintering: will be packaged with the aluminium alloy box of powder mix blank, being put into vacuum tightness is 10 ^-3in the vacuum oven of Pa, carry out vacuum stripping sintering; 540 ℃ of sintering temperatures, sintering time is 6 hours;

Step 4 hot rolling peeling: the aluminium alloy box after sintering is carried out to continuous multiple tracks hot rolling at 450 ℃, draught be every time 10%, when the density of blank is 85%TD, the rolling of 90 ° commutates, and remove the outer field aluminium alloy involucrum of blank, carry out multi-pass hot rolling, draught is 35% again, is rolled to the sheet material of thickness 2.5mm;

Step 5 anneal: the sheet material after hot rolling peeling is carried out to anneal, make the neutron absorber material of density 98.5%.

Embodiment 3

Step 1 batch mixing: by the B4C powder of massfraction 35%, mean particle size 25 μ m, the Al matrix powder of massfraction 65%, mean particle size 45 μ m mixes in mixer;

Step 2 charging: with embodiment 1;

Step 3 vacuum stripping sintering: will be packaged with the aluminium alloy box of powder mix blank, be put in the vacuum oven that vacuum tightness is 10-3Pa and carry out vacuum stripping sintering; 480 ℃ of sintering temperatures, sintering time is 15 hours;

Step 4 hot rolling peeling: the aluminium alloy box after sintering is carried out to continuous multiple tracks hot rolling at 540 ℃, draught be every time 10%, when the density of blank is 90%TD, remove the outer field aluminium alloy involucrum of blank, when the density of blank is 95%TD, the rolling of 90 ° that commutates, then carry out multi-pass hot rolling, draught is 30%, is rolled to the sheet material of thickness 2.0mm;

Step 5 anneal: the sheet material of hot rolling is carried out to anneal, make density and be 98.8% neutron absorber material.

Embodiment 4

Step 1 batch mixing: by the B of massfraction 65%, mean particle size 60 μ m ₄c powder, the Al matrix powder of massfraction 35%, mean particle size 35 μ m mixes in mixer;

Step 2 charging: with embodiment 1;

Step 3 vacuum stripping sintering: will be packaged with the aluminium alloy box of powder mix blank, be put in the vacuum oven that vacuum tightness is 10-2Pa and carry out vacuum stripping sintering; 350 ℃ of sintering temperatures, sintering time is 20 hours;

Step 4 hot rolling peeling: the aluminium alloy box after sintering is carried out to continuous multiple tracks hot rolling at 510 ℃, draught be every time 10%, when the density of blank is 83%TD, 90 ° of rollings commutate, when the density of blank is 90%TD, removes the outer field aluminium alloy involucrum of blank, then carry out multi-pass hot rolling, draught is 30%, is rolled to the sheet material of thickness 2.7mm;

Step 5 anneal: the sheet material after hot rolling is carried out to anneal, make density and be 99.1% neutron absorber material.

Claims

1. a high B ₄c content aluminum matrix composite, is characterized in that: the Al alloy powder and the granularity that by granularity, are 35 ~ 60 μ m are the B of 10 ~ 60 μ m ₄c powder forms, and Al alloy powder and granularity are the B of 10 ~ 60 μ m ₄the ratio of C powder is 90 ~ 35: 10 ~ 65, by mass percentage.