CN1381606A

CN1381606A - Process for preparing closed-pore foam Al-alloy

Info

Publication number: CN1381606A
Application number: CN 02112600
Authority: CN
Inventors: 何德坪; 郑明军
Original assignee: Southeast University
Current assignee: Southeast University
Priority date: 2002-01-28
Filing date: 2002-01-28
Publication date: 2002-11-27
Anticipated expiration: 2022-01-28
Also published as: CN1161485C

Abstract

A closed-pore foam Al-alloy is prepared from Cu (3-12 mass%), Mn (0.2-1.2), Ti (0.1-0.5), Cr (0.1-0.4) and Al (the rest) through smelting, warming, adding viscosity increaser, stirring touniformity, adding foaming agent, stirring, holding the temp. for 1-10 min, and cooling in all directions at the same time.

Description

The preparation method of closed-cell foam aluminium alloy

One, technical field:

The present invention relates to a kind of manufacture method of porous foam aluminium alloy, refer in particular to the preparation method of closed-cell foam aluminium alloy.

Two, background technology:

Existing method of cooling is to grow up at born of the same parents' shape aluminum or aluminum alloy melt promptly to begin to cool down later on to predetermined height, and this moment, the melt foam was generally also grown with higher speed, this moment, molten intravital whipping agent residual volume was also bigger, the continuation decomposition of whipping agent can cause air entrapment to break, form big hole defect, yield rate is lower.Existing unidirectional solidification mode is for the aluminum-silicon alloy melt, owing to have liquid-solid coexistence phase region from liquid state when the solid state transformation, this regional surface tension can produce axially contraction rapidly greater than liquid surface tension if adopt with unidirectional refrigerative method.Problem generally is to adopt the method that strengthens the tackifier consumption hereto, but the increase of tackifier add-on can cause increasing of oxide compound, thereby causes the rapid decline of performance.

Three, summary of the invention:

Technical problem: the invention provides a kind of preparation method that can make the closed-cell foam aluminium alloy of pore structure and the uniform porous Al alloy of porosity.

Technical scheme: the present invention is a kind of preparation method who is used to make closed-cell foam aluminium alloy, this method is: the first step: get copper, the manganese that accounts for the .2%-1.2% of alloy total amount massfraction, the titanium that accounts for alloy total amount massfraction 0.1%-0.5% that accounts for alloy total amount massfraction 3%-12%, chromium and the surplus aluminium that accounts for alloy total amount massfraction 0.1%-0.4%, be heated to fusing, insulation makes temperature full and uniform stable; Second step: add and be equivalent to the molten aluminium alloy of the 0.5%-5% tackifier of aluminium alloy add-on (weight percent), stir to melting and heat preservation; The 3rd step: add the whipping agent of the 0.5%-5% that is equivalent to aluminium alloy add-on (weight percent), stir, make whipping agent even at the melt thorough mixing; The 4th step: after treating that whipping agent mixes, propose stirring rake rapidly, crucible is incubated 1-10 minute in electric furnace, make whipping agent continue to decompose; The 5th step: treat to adopt each after cooling off simultaneously, making aluminium alloy melt foam cooled and solidified, to obtain the closed pore aluminium alloy after molten aluminium grows to the steady stage.

Technique effect: 1. adding in the aluminium alloy solution of fusing can generation Al in the calcium solution ₂O ₃, CaAl ₄Deng compound between refractory metal, make the viscosity of aluminium alloy solution increase bubble floating that stops the whipping agent generation and the life-span that prolongs bubble.When adding the whipping agent titanium hydride, titanium hydride is at high temperature emitted a large amount of gases, these gases are the forming core substrate with refractory oxide and intermetallic compound, the formation bubble is also grown up, after bubble arrived to a certain degree, titanium hydride stopped venting, and bubble reaches the steady stage, and can stablize maintenance for some time (bubble lifetime), solidify shrinkage defect and the whole contraction defective that just can eliminate the center simultaneously around begin this moment.Simultaneously, make hilum in process of setting, keep stress equalization, thereby under high porosity (P=86～91%) situation, still can keep not breaking, hole size is similar in making, the viscosity of melt is uniform and stable, makes whipping agent be uniformly dispersed, Zhi Bei product pore structure is even like this, and yield rate reaches more than 90%, so the present invention has porosity height and inner hole structure advantage of uniform.2. adopting aluminium alloy is that born of the same parents' shape aluminium of matrix preparation has improved more than 40% than the intensity of born of the same parents' shape aluminium of pure aluminum substrate preparation; Platform phase is more flat than born of the same parents' shape fine aluminium simultaneously, this just makes that the energy-absorbing efficient of born of the same parents' shape aluminium alloy is higher, energy absorption ability is bigger, the energy absorption ability of born of the same parents' shape aluminium alloy is big more than 10% than born of the same parents' shape fine aluminium, be to reach 40% at 90% o'clock in porosity especially, solved foam aluminium alloy low shortcoming of intensity under high hole condition fully.By the copper that accounts for alloy total amount massfraction 3%-12%, account for the manganese of the .2%-1.2% of alloy total amount massfraction, account for the titanium of alloy total amount massfraction 0.1%-0.5%, account for the chromium of alloy total amount massfraction 0.1%-0.4% and the copper that surplus aluminium accounts for alloy total amount massfraction 3%-12%, account for the manganese of the .2%-1.2% of alloy total amount massfraction, account for the titanium of alloy total amount massfraction 0.1%-0.5%, account in the foam aluminium alloy that the chromium of alloy total amount massfraction 0.1%-0.4% and surplus aluminium forms, chromium can crystal grain thinning, helps the raising of foam aluminium alloy intensity.

Four, description of drawings:

Fig. 1 is an aluminium alloy melt foam growth curve chart related to the present invention.

Fig. 2 is the compressive yield stress comparison diagram of born of the same parents' shape fine aluminium and born of the same parents' shape aluminium alloy.

Fig. 3 is the energy absorption ability comparison diagram of born of the same parents' shape fine aluminium and born of the same parents' shape aluminium alloy.

Five, specific embodiments

The present invention is a kind of preparation method who is used to make closed-cell foam aluminium alloy, this method is: the first step: get copper, the manganese that accounts for the .2%-1.2% of alloy total amount massfraction, the titanium that accounts for alloy total amount massfraction 0.1%-0.5% that accounts for alloy total amount massfraction 3%-12%, chromium and the surplus aluminium that accounts for alloy total amount massfraction 0.1%-0.4%, be heated to fusing, insulation makes temperature full and uniform stable; Second step: add and be equivalent to the molten aluminium alloy of the 0.5%-5% tackifier of aluminium alloy add-on (weight percent), stir to melting and heat preservation; The 3rd step: add the whipping agent of the 0.5%-5% that is equivalent to aluminium alloy add-on (weight percent), stir, make whipping agent even at the melt thorough mixing; The 4th step: after treating that whipping agent mixes, propose stirring rake rapidly, crucible is incubated 1-10 minute in electric furnace, make whipping agent continue to decompose; The 5th step: treat to adopt each after cooling off simultaneously, making aluminium alloy melt foam cooled and solidified, to obtain the closed pore aluminium alloy after molten aluminium grows to the steady stage, behind the melt tackify, add titanium hydride, as whipping agent, whipping agent also can be volcanic ash, and lime carbonate, above-mentioned tackifier are calcium.

Claims

1, a kind of preparation method who is used to make closed-cell foam aluminium alloy is characterized in that:

The first step: get copper, the manganese that accounts for the .2%-1.2% of alloy total amount massfraction, the titanium that accounts for alloy total amount massfraction 0.1%-0.5% that accounts for alloy total amount massfraction 3%-12%, chromium and the surplus aluminium that accounts for alloy total amount massfraction 0.1%-0.4%, be heated to fusing, insulation makes temperature full and uniform stable;

Second step: add and be equivalent to the molten aluminium alloy of the 0.5%-5% tackifier of aluminium alloy add-on (weight percent), stir to melting and heat preservation;

The 3rd step: add the whipping agent of the 0.5%-5% that is equivalent to aluminium alloy add-on (weight percent), stir, make whipping agent even at the melt thorough mixing;

The 4th step: after treating that whipping agent mixes, propose stirring rake rapidly, crucible is incubated 1-10 minute in electric furnace, make whipping agent continue to decompose;

The 5th step: treat to adopt each after cooling off simultaneously, making aluminium alloy melt foam cooled and solidified, to obtain the closed pore aluminium alloy after molten aluminium grows to the steady stage.

2, the preparation method of closed-cell foam aluminium alloy according to claim 1 is characterized in that adding titanium hydride behind the melt tackify, as whipping agent.

3, the preparation method of closed-cell foam aluminium alloy according to claim 1 is characterized in that tackifier are calcium.