CN100392127C - Method for preparing foamed aluminium alloy product by secondary foaming - Google Patents
Method for preparing foamed aluminium alloy product by secondary foaming Download PDFInfo
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- CN100392127C CN100392127C CNB2006100882464A CN200610088246A CN100392127C CN 100392127 C CN100392127 C CN 100392127C CN B2006100882464 A CNB2006100882464 A CN B2006100882464A CN 200610088246 A CN200610088246 A CN 200610088246A CN 100392127 C CN100392127 C CN 100392127C
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Abstract
The present invention discloses a method for preparing foam aluminum alloy products by secondary foaming. Firstly, aluminum alloy is heated until fusion, temperature is regulated to 630 DGE C to 680 DGE C, calcium is added in molten aluminum alloy and is stirred for 1 to 30 minutes, titanium hydride is added and is stirred, titanium hydride is distributed evenly in fondant, the fondant which is stirred is cooled, primary foamed aluminum alloy with the porosity below 70% is obtained; step two, a primary foamed aluminum alloy precast member with the porosity below 70% is placed in a mold and is in heat preservation for 3 to 40 minutes under the temperature of 700 DGE C to 1200 DGE C, the primary foamed aluminum alloy precast member is foamed for second time in the mold, the foam aluminum alloy which is foamed is cooled, and a foam aluminum alloy product is obtained. The present invention has the advantages of simple technological method and low cost and can be used for preparing foam aluminum alloy shaped members, sandwich structures, foam aluminum alloy filling members and foam aluminum alloy products with embedded members of various kinds of porosity with even porosity.
Description
Technical field
The present invention relates to a kind of preparation method of foamed aluminium alloy product, relate in particular to a kind of method of preparing foamed aluminium alloy product by secondary foaming.
Background technology
Ultra-light metal construction so that closed-cell aluminum foam is attached most importance to owing to special pore texture, has realized structured material lightweight, multifunction, thereby has become the focus of current space flight and hi-tech.
Because automobile etc. are civilian and the demand of high-tech sector, foamed aluminium abnormal member, sandwich structure are just becoming the forward position in the foamed metal preparation field.Traditional foam melt method directly prepares aspects such as abnormal member, sandwich structure, foam aluminium alloy filling member, built-in fitting and exists the difficulty that is difficult to go beyond, and powder metallurgic method prepares aspects such as foamed aluminium abnormal member, sandwich structure and then has defectives such as cost height, technology instability.
Summary of the invention
The invention provides a kind of preparing foamed aluminium alloy product by secondary foaming preparation method, this method mainly is used to prepare foam aluminium alloy abnormal member, sandwich structure, bead filling member with complex configuration and the various products such as foamed aluminium alloy product that have built-in fitting, this method is simple, cost is low, method is reliable, and the foamed aluminium alloy product pore structure of preparation is even, controlled porosity.
The present invention adopts following technical scheme:
A kind of method of preparing foamed aluminium alloy product by secondary foaming comprises following a few step:
The first step: aluminium alloy is heated to fusing, and adjust the temperature to 630 ℃-680 ℃, the calcium that adds the 0.5%-5% that is equivalent to aluminium alloy weight is to molten aluminium alloy, stirred 1-30 minute, the titanium hydride that adds the 0.5%-5% that is equivalent to aluminium alloy weight again, stirring is evenly distributed titanium hydride in melt, the melt cooling with after stirring obtains porosity and is lower than a foam aluminium alloy prefabricated component of 70%;
Second step: above-mentioned porosity is lower than a foamed aluminium alloy prefabricated component of 70% and puts into mould, and under 700 ℃～1200 ℃ temperature, be incubated 3～40 minutes, make foamed aluminium alloy prefabricated component secondary foamization in mould, with the cooling of the foam aluminium alloy after the foaming, obtain foamed aluminium alloy product.
Inventive principle:
Titanium hydride is the motivating force of aluminium alloy foamed, and in foaming process, the decomposition amount of titanium hydride never causes people's attention, and the present invention carries out having obtained technical scheme of the present invention on the basis of quantitative analysis at the decomposition course to titanium hydride.
The titanium hydride decomposition temperature is to the influence of hydrogen yield: to titanium hydride decomposition kinetics system of equations, can calculate productive rate f of hydrogen under 903k, 913k, 923k, 933k, 943k
1Time dependent curve.Under the identical resolving time, temperature is high more, productive rate f of hydrogen
1High more; Resolving time is long more, a productive rate f of hydrogen
1High more.670 ℃ of following hydrogen yield f
1Higher more than 60% than 650 ℃.
The titanium hydride resolving time is to the influence of hydrogen yield: can accounting temperature be under the 923k, the predecomposition time be respectively the hydrogen secondary productive rate f of 0s (promptly once decomposing), 60s, 80s, 100s, 120s, 150s
2Time dependent relation.The secondary decomposition curve is similar with the predecomposition curve shape, but secondary productive rate f
2Obviously reduce, and the predecomposition time is long more, secondary decomposes hydrogen yield f
2Just low more.But even the predecomposition time reaches 150s, its secondary decomposes hydrogen yield f
2All greater than 10%.
The continuous hydrogen yield that the titanium hydride secondary decomposes under the intensification condition: for the predecomposition temperature is respectively 923k, 933k, 943k, 953k, the predecomposition time is the secondary of the 80s decomposition curve that heats up continuously, and temperature rise rate is 1.26k/s.Under the same predecomposition time, the predecomposition temperature is high more, and the productive rate that the secondary that heats up continuously decomposes hydrogen is low more.Hydrogen secondary productive rate under the intensification condition is all greater than 10% continuously.
And form being calculated as follows of the necessary hydrogen of foam aluminium alloy:
In foaming process, titanium hydride decomposes the overwhelming majority of the hydrogen that produces owing to stir in the air of becoming separated in flight or burn, and only some remains in the melt to form foam aluminium alloy.Calculate the necessary amounts of hydrogen of foam aluminium alloy that forms certain porosity below: the quality of hydrogen in the melt foam before the cooling of melt foamed.
Be calculated as example with foam melt method foamed condition: the foamed temperature is T, and the quality of aluminium alloy melt is m
Al, the per-cent that the adding quality of titanium hydride accounts for aluminium alloy is a, the volume of hydrogen is V in the foam aluminium alloy before cooling
g, porosity is Pr, the average internal pressure of bubble is P
In, in quick process of cooling, titanium hydride decomposes the gas volume of emitting ignores (making its very fast cooling thereby can make that foam aluminium alloy melt porosity is lower by control), thereby the quality m of the gas in the bubble before the foam aluminium alloy cooling
fFor:
The hydrogeneous quality m that titanium hydride is total
0For:
Thereby the quality m of the gas in the preceding bubble of foam aluminium alloy cooling
f(promptly forming the necessary hydrogen quality of foam aluminium alloy) accounts for the total hydrogeneous quality m of titanium hydride
0Per-cent k be:
Calculate k and also need to determine P
In, process is as follows:
The bubble resistance mainly is made up of three parts: the static pressure P of aluminium alloy melt
l, the additional pressure Δ P and the barometric point P that cause by surface tension
Normal atmosphere, at bubble inner pressure power P
InAnd reach running balance between the resistance of air bubble expansion:
P
In=P
Normal atmosphere+ P
l+ Δ P (4)
Wherein, P
l=ρ
Al.g.h, under common foamed condition, the maximum height h of foam aluminium alloy can reach 200mm, then the static pressure P of melt maximum
l=0.054 * 10
5N/m
2, additional pressure is Δ P=2 σ/r, and the surface tension of aluminium alloy is 0.98N/m, and the mean radius of bubble (homogenizing stir after) is about 0.0008m～0.003m, thereby the additional pressure maximum value reaches and is about 0.0245 * 10
5N/m
2For micro-bubble, because the internal pressure that additional pressure produces is bigger, but its cumulative volume is also very little, thereby its total amount seldom, can ignore.
Therefore, can get by formula (4): P
g≈ 1.09175 * 10
5Pa;
Can calculate by (3) and to form the per-cent that the necessary hydrogen quality of foam aluminium alloy accounts for the total hydrogeneous quality of titanium hydride and be no more than 7.13%.
Thereby the gas volume (greater than 10%) that the titanium hydride secondary under the conventional foamed condition decomposes is greater than forming the necessary amounts of hydrogen of foam aluminium alloy (less than 7.13%), and secondary foamization is feasible in theory.
The present invention obtains following technique effect:
1. utilization of the present invention is decomposed the hydrogen that produces because of titanium hydride decomposes not exclusively remaining titanium hydride in foaming process, makes aluminium alloy melt secondary foamization after the melted by heat to obtain foam aluminium alloy; The characteristics that the present invention utilizes titanium hydride thermolysis amount and temperature to be closely related, thereby be 630-680 ℃ and controlled thermolysis amount of titanium hydride by controlling a heat decomposition temperature, and guaranteed hydrogen decomposition amount in the foaming process for the second time, thereby the present invention need not titanium hydride is done any processing, thereby simplified technological process, reduced cost.
2. the present invention need not a foamed aluminium alloy prefabricated component is suppressed, thereby method is simple, and cost is low.Comparatively speaking, other method such as powder metallurgic method need be higher by higher pressure densification thereby cost.
3. had certain porosity owing to a foamed aluminium alloy prefabricated component among the present invention, made the drain age velocity of foam aluminium alloy be suppressed, thereby the pore structure of the secondary foam aluminium alloy that obtains is more even.
4. the present invention is by a foamed temperature control of control titanium hydride thermolysis amount, the control of secondary foam time is required to compare broad, thereby, can adopt sufficiently long churning time, make titanium hydride in foam aluminium alloy, be uniformly dispersed, thereby make that the foamed aluminium alloy product pore structure of secondary foam preparation is even.
5. the present invention develops on the foam melt method basis of calcium tackify and comes, and the mechanism of the mechanism of calcium tackify and silicon carbide ceramics particle tackify is different, the viscosifying action that produces behind the calcium adding aluminium alloy melt mainly be intermetallic compound; The intermetallic compound that the aluminium alloy melt of calcium tackify is evenly distributed by reaction acquisition in the whipping process, thereby have uniform characteristics of viscosity, it still is uniformly that these intermetallic compounds distribute in the process of hot pressing and reheat, thereby obtains the uniform secondary foam aluminium alloy of pore structure easily; And the foam aluminium alloy of silicon carbide ceramics tackify, distributing is difficult for evenly, thereby the foam aluminium alloy of preparation is evenly difficult, in addition because silicon carbide ceramics particle self unstable also can cause product quality problem.
6. in the reheat process, can produce enough hydrogen owing to remaining titanium hydride under the foamed condition, thereby the present invention can prepare secondary foam bubble foam aluminium alloy abnormal member, sandwich structure, foam aluminium alloy filling ball and other appearance profiles of higher porosity (porosity ranges 50～90%) filling member, have the foamed aluminium alloy product of built-in fitting etc., realize the change of foamed aluminium alloy product appearance profile by change to the shape of second time of foaming dies cavity.The foamed aluminium alloy product foamed aluminium alloy product of these secondary foam method preparations has the characteristics of high strength, rigidity, high-energy absorption, and the important application prospect is arranged.
7. the present invention carries out surface treatment to aluminium sheet and prefabricated component, removes the oxygen on aluminium surface, thereby makes the plate core in conjunction with firm, thereby has improved the mechanical property of structure.
8. to a foamed aluminium alloy prefabricated component heating than low porosity, can make the secondary foam aluminium alloy prefabricated component melt, wherein remaining simultaneously titanium hydride decomposes generation hydrogen makes its foamed, obtain secondary foam bubble foam aluminium alloy, improve Heating temperature, can make the prefabricated component rate of heating improve, thereby reduce the loss amount of hydrogen, can also further improve the decomposition amount of titanium hydride, and then improve the foam aluminium alloy porosity.
9. the present invention can make the foam aluminium alloy abnormal member with complicated appearance that has epidermis, can prepare with the foam aluminium alloy is the sandwich structure of sandwich, (so-called foam aluminium alloy filling ball is meant can to prepare the foam aluminium alloy filling ball, the appearance profile of foamed aluminium alloy product is spherical, and have one deck epidermis, it act as, need to fill when having the space of complicated shape, the foam aluminium alloy filling ball less with these relative dimensions is filled into these spaces, can play the effect of vibration damping and energy-absorbing equally), also can prepare the various foamed aluminium alloy product that has built-in fitting, and method is simple, cost is low.
Description of drawings
Fig. 1 is the foamed aluminium alloy product pore structure figure (porosity 85%, aperture 1.5-2.5mm) of secondary foam preparation
Fig. 2 is the various different profile goods figure of foam aluminium alloy (comprising filling ball, porosity 50%-90%, aperture 1-5mm) of secondary foam preparation
Fig. 3 is foam aluminium alloy abnormal member, the filling member figure (porosity 50%-90%, aperture 1-5mm) of secondary foam preparation
Embodiment
The method of 1 one kinds of preparing foamed aluminium alloy product by secondary foaming of embodiment comprises following a few step:
The first step: aluminium alloy is heated to fusing, and adjust the temperature to 630 ℃-680 ℃, the calcium that adds the 0.5%-5% that is equivalent to aluminium alloy weight is to molten aluminium alloy, stirred 1-30 minute, the titanium hydride that adds the 0.5%-5% that is equivalent to aluminium alloy weight again, stirring is evenly distributed titanium hydride in melt, the melt cooling with after stirring obtains porosity and is lower than a foam aluminium alloy prefabricated component of 70%;
Second step: above-mentioned porosity is lower than a foamed aluminium alloy prefabricated component of 70% and puts into mould, and under 700 ℃～1200 ℃ temperature, be incubated 3～40 minutes, make foamed aluminium alloy prefabricated component secondary foamization in mould, with the cooling of the foam aluminium alloy after the foaming, obtain foamed aluminium alloy product.
The method of 2 one kinds of preparing foamed aluminium alloy product by secondary foaming of embodiment comprises following a few step:
The first step: aluminium alloy is heated to fusing, wherein, aluminium alloy such as ZL101, ZL102, the ZL111 series alloy also can be that casting Al-Cu is an alloy, the trade mark such as ZL201, ZL202, ZL205 series alloy, also can be main cupric or main siliceous wrought aluminium alloy, can also be magniferous aluminium alloy, as ZL301 etc., adjust the temperature to 630 ℃-680 ℃, temperature can be 635 ℃, 642 ℃, 650 ℃, 660 ℃, 665 ℃, 670 ℃, the calcium that adds the 0.5%-5% that is equivalent to aluminium alloy weight is to molten aluminium alloy, and the add-on of calcium can be chosen for 0.8%, 1.2%, 1.5%, 2.0%, 2.8%, 3.5%, 4.2%, 4.7%, stirred 1-30 minute, churning time can be chosen for 3 minutes, 8 minutes, 10 minutes, 15 minutes, 22 minutes, 25 minutes, stirring velocity can be 300～600rpm, add the titanium hydride of the 0.5%-5% that is equivalent to aluminium alloy weight again, the add-on of titanium hydride can be chosen for 0.8%, 1.2%, 1.5%, 2.0%, 2.8%, 3.5%, 4.2%, 4.7%, stirring is evenly distributed titanium hydride in melt, speed that can 800～5000rpm stirred 60～1000 seconds, and stirring velocity can be chosen for, 4500rpm, 4000rpm, 3200rpm, 2500rpm, 1000rpm, 900rpm, churning time can be chosen for 70s, 90s, 150s, 250s, 400s, 550s, 600s, 800s, 900s is with the melt cooling after stirring, obtain porosity and be lower than a foam aluminium alloy prefabricated component of 70%, for example porosity is 60%, 55%, 54%, 52%, 45%, 39%, 35%, 28%, 22%, 18%, 15%;
Second step: above-mentioned porosity is lower than a foamed aluminium alloy prefabricated component of 70% and puts into mould, and under 700 ℃～1200 ℃ temperature, be incubated 3～40 minutes, wherein, temperature can be chosen for 750 ℃, and 800 ℃, 850 ℃, 880 ℃, 950 ℃, 1000 ℃, 1150 ℃, soaking time can be chosen for 5 minutes, 8 minutes, 12 minutes, 20 minutes, 27 minutes, 33 minutes, 38 minutes, make foamed aluminium alloy prefabricated component secondary foamization in mould, with the cooling of the foam aluminium alloy after the foaming, obtain foamed aluminium alloy product, porosity ranges is 50%-90%, can be 50%, 60%, 70%, 80%, 85%, 90%, the aperture is 1-5mm.
In the present embodiment, mould is the mould that has cavity, its shape is set according to actual needs, can be spherical, cylindrical, square column type, perhaps irregular parabola etc., can to prepare as required with the foam aluminium alloy simultaneously is the sandwich sandwich structure, have other foamed aluminium alloy products of built-in fitting, and this foamed aluminium alloy product can have different shape and size, is used as many-sided filling member, structural part and functional parts such as energy absorption and carrying, damping, vibration damping.The appearance profile of foam aluminium alloy filling member must change mainly to be realized by the change to the dies cavity shape, and to the control of the foam aluminium alloy porosity of secondary foam preparation mainly by prefabricated component quality size is controlled, promptly by the control of a foam aluminium alloy prefabricated component quality size being realized control to foam aluminium alloy abnormal member mean porosities, the pass of the foam aluminium alloy porosity of prefabricated component quality and secondary foam preparation is: Prb=1-m/ (ρ V), wherein, Prb is the foam aluminium alloy mean porosities of secondary foam preparation, m is the quality of a foamed aluminium alloy prefabricated component, ρ is the density of aluminium alloy, and V is the volume of dies cavity.For example, the density of aluminium can be taken as 2780 kilograms every cubic metre, and one time the foam aluminium alloy prefabricated component can be chosen for 68 grams, and the volume of dies cavity is 163000 cubic millimeters, and the foam aluminium alloy of this foamed preparation fills up the entire die inner chamber, and its mean porosities is 85%.
The method of 3 one kinds of preparing foamed aluminium alloy product by secondary foaming of embodiment comprises following a few step:
The first step: aluminium alloy is heated to fusing, wherein, aluminium alloy such as ZL101, ZL102, the ZL111 series alloy also can be that casting Al-Cu is an alloy, as ZL201, ZL202, ZL205 series alloy, also can be main cupric or main siliceous wrought aluminium alloy, adjust the temperature to 630 ℃-680 ℃, temperature can be 635 ℃, 642 ℃, 650 ℃, 660 ℃, 665 ℃, 670 ℃, the calcium that adds the 0.5%-5% that is equivalent to aluminium alloy weight is to molten aluminium alloy, the add-on of calcium can be chosen for 0.8%, 1.2%, 1.5%, 2.0%, 2.8%, 3.5%, 4.2%, 4.7%, stirred 1-30 minute, churning time can be chosen for 3 minutes, and 8 minutes, 10 minutes, 15 minutes, 22 minutes, 25 minutes, stirring velocity can be 300～600rpm, adds the titanium hydride of the 0.5%-5% that is equivalent to aluminium alloy weight again, and the add-on of titanium hydride can be chosen for 0.8%, 1.2%, 1.5%, 2.0%, 2.8%, 3.5%, 4.2%, 4.7%, stirred 60～1000 seconds with the speed of 800～5000rpm, for example, stirring velocity can be chosen for, 4500rpm, 4000rpm, 3200rpm, 2500rpm, 1000rpm, 900rpm, churning time can be chosen for 70s, 90s, 150s, 250s, 400s, 550s, 600s, 800s, 900s is evenly distributed titanium hydride in melt, will stir back melt cooling, obtain porosity and be lower than a foam aluminium alloy prefabricated component of 70%, for example porosity is 60%, 54%, 52%, 45%, 39%, 35%, 28%, 22%, 18%, 15%; This foam aluminium alloy prefabricated component has relatively thick and good air tightness, can effectively prevent escape of gas in post bake process.
Second step: above-mentioned porosity is lower than a foamed aluminium alloy prefabricated component of 70% and puts into mould, and under 700 ℃～1200 ℃ temperature, be incubated 3～40 minutes, wherein, temperature can be chosen for 750 ℃, and 800 ℃, 850 ℃, 880 ℃, 950 ℃, 1000 ℃, 1150 ℃, make and foamed aluminium alloy prefabricated component secondary foamization in mould, obtain foamed aluminium alloy product the cooling of the foam aluminium alloy after the foaming, porosity ranges is 50%-90%, and the aperture is 1-5mm.Wherein, mould is the mould that has cavity, and its shape is set according to actual needs, can be spherical, cylindrical, square column type, perhaps irregular parabola etc.
In the present embodiment, for obtaining to have the foam aluminium alloy abnormal member of epidermis, special-shaped hollow mould the die cavity hollow shape can be arbitrary shape, comprise regular shape and irregularly shaped, can be spherical, cylindrical, square column type, perhaps irregular parabola during enforcement, can be placed in prefabricated component the mould that needs the filled and process aluminium alloy or the hollow space of part in advance; Soaking time can be 5 minutes, 7.5 minutes, and 8.8 minutes, 11 minutes, 14 minutes, 16 minutes, 19 minutes.
The method of 4 one kinds of preparing foamed aluminium alloy product by secondary foaming of embodiment comprises following a few step:
The first step: aluminium alloy is heated to fusing, wherein, aluminium alloy such as ZL101, ZL102, the ZL111 series alloy also can be that casting Al-Cu is an alloy, as ZL201, ZL202, ZL205 series alloy, also can be main cupric or main siliceous wrought aluminium alloy, adjust the temperature to 630 ℃-680 ℃, the calcium that adds the 0.5%-5% that is equivalent to aluminium alloy weight be to molten aluminium alloy, the add-on of calcium can be chosen for 0.8%, 1.2%, 1.5%, 2.0%, 2.8%, 3.5%, 4.2%, 4.7%, stirred 1-30 minute, churning time can be chosen for 3 minutes, and 8 minutes, 10 minutes, 15 minutes, 22 minutes, 25 minutes, stirring velocity can be 300～600rpm, adds the titanium hydride of the 0.5%-5% that is equivalent to aluminium alloy weight again, and the add-on of titanium hydride can be chosen for 0.8%, 1.2%, 1.5%, 2.0%, 2.8%, 3.5%, 4.2%, 4.7%, stirred 60～1000 seconds with the speed of 800～5000rpm, for example, stirring velocity can be chosen for, 4500rpm, 4000rpm, 3200rpm, 2500rpm, 1000rpm, 900rpm, churning time can be chosen for 70s, 90s, 150s, 250s, 400s, 550s, 600s, 800s, 900s is evenly distributed titanium hydride in melt, with the melt cooling after stirring, obtain porosity and be lower than a foam aluminium alloy prefabricated component of 70%, for example porosity is 54%, 52%, 45%, 39%, 35%, 28%, 22%, 18%, 15%;
Second step: above-mentioned porosity is lower than a foamed aluminium alloy prefabricated component of 70% and puts into mould, and under 700 ℃～1200 ℃ temperature, be incubated 3～40 minutes, wherein, temperature can be chosen for 750 ℃, and 800 ℃, 850 ℃, 880 ℃, 950 ℃, 1000 ℃, 1150 ℃, make and foamed aluminium alloy prefabricated component secondary foamization in mould, obtain foamed aluminium alloy product the cooling of the foam aluminium alloy after the foaming, porosity ranges is 50%-90%, and the aperture is 1-5mm.Wherein, mould is the mould that has cavity, and its shape is set according to actual needs, can be spherical, cylindrical, square column type, perhaps irregular parabola etc.
In the present embodiment; in second step; above-mentioned porosity is lower than a foamed aluminium alloy prefabricated component of 70% to be done surperficial deoxygenation and handles; aluminium sheet that surperficial deoxygenation was handled or the aluminium alloy plate surface that is positioned over prefabricated component then; put it in the mould again; in case of necessity; add argon gas; prefabricated component in protection of inert gas such as nitrogen or the carbonic acid gas mould; to avoid its further oxidation; make prefabricated component and epidermis be under 700 ℃～1200 ℃ the temperature insulation 3-40 minute; thereby obtain to have the foamed aluminium alloy product of thicker epidermis; as plate core mortise is panel with the aluminum or aluminum alloy; foam aluminium alloy is the sandwich structure of sandwich; the filling member that has thick epidermis with complex configuration; the used foam aluminium alloy of epidermis can be the wrought aluminium alloy of common usefulness; as duralumin; super-hard aluminum alloys; rust-preventing aluminum alloys etc., the trade mark can be LY12, F5 etc. respectively.
The method that the surface deoxygenation is handled is as follows:
The method that surface treatment and aluminum alloy surface deoxygenation are handled is similar, and at first carry out electrochemical deoiling: the electrochemical deoiling process is by chemical reaction and physics chemical action, removes the greasy dirt on product surface.Electrochemical deoiling adopts in the weakly alkaline solution and carries out.The prescription of electrochemical deoiling liquid and processing condition: 1, prescription: sodium hydroxide 30-50G/L, industrial detergent 0.5-1ML/L, water 70-125G; 2, processing condition: temperature: 50-60 ℃, the time: 1-2min; 3, use flushing with clean water after the oil removing; 4, chemical deoxidization film: carry out cleanup acid treatment with in and the alkali lye of product remained on surface, and remove its natural oxide film, and make it to expose the aluminium and the alloy matrix aluminum of product, make for the silicon-aluminum containing alloy, must carry out pickling with mixing solutions, with the floating ash of the dark-coloured silicon of removing its surface; The prescription of pickle solution: dense nitre liquid 200～270ML/L; Temperature: room temperature time: 1-3min.Remove the pickle solution prescription of the floating ash of siliceous articles made of aluminium alloy surface film oxide and silicon: concentrated nitric acid 3 volumes; Dense hydrofluoric acid 1 volume, temperature: room temperature, time: 5-15min.
The method of 5 one kinds of preparing foamed aluminium alloy product by secondary foaming of embodiment comprises following a few step:
The first step: aluminium alloy is heated to fusing, wherein, aluminium alloy such as ZL101, ZL102, the ZL111 series alloy also can be that casting Al-Cu is an alloy, as ZL201, ZL202, ZL205 series alloy, also can be main cupric or main siliceous wrought aluminium alloy, adjust the temperature to 630 ℃-680 ℃, temperature can be 635 ℃, 642 ℃, 650 ℃, 660 ℃, 665 ℃, 670 ℃, the calcium that adds the 0.5%-5% that is equivalent to aluminium alloy weight is to molten aluminium alloy, the add-on of calcium can be chosen for 0.8%, 1.2%, 1.5%, 2.0%, 2.8%, 3.5%, 4.2%, 4.7%, stirred 1-30 minute, churning time can be chosen for 3 minutes, and 8 minutes, 10 minutes, 15 minutes, 22 minutes, 25 minutes, stirring velocity can be 300～600rpm, adds the titanium hydride of the 0.5%-5% that is equivalent to aluminium alloy weight again, and the add-on of titanium hydride can be chosen for 0.8%, 1.2%, 1.5%, 2.0%, 2.8%, 3.5%, 4.2%, 4.7%, stirred 60～1000 seconds with the speed of 800～5000rpm, for example, stirring velocity can be chosen for, 4500rpm, 4000rpm, 3200rpm, 2500rpm, 1000rpm, 900rpm, churning time can be chosen for 70s, 90s, 150s, 250s, 400s, 550s, 600s, 800s, 900s is evenly distributed titanium hydride in melt, with the melt cooling after stirring, obtain porosity and be lower than a foam aluminium alloy prefabricated component of 70%, for example porosity is 60%, 54%, 52%, 45%, 39%, 35%, 28%, 22%, 18%, 15%;
Second step: above-mentioned porosity is lower than a foamed aluminium alloy prefabricated component of 70% and puts into mould, and be incubated 3～40 minutes under 700 ℃～1200 ℃ temperature, wherein, temperature can be chosen for 750 ℃, 800 ℃, 850 ℃, 880 ℃, 950 ℃, 1000 ℃, 1150 ℃, make and foamed aluminium alloy prefabricated component secondary foamization in mould, obtain foamed aluminium alloy product the cooling of the foam aluminium alloy after the foaming, porosity can be 50%, 60%, 70%, 80%, 85%, 90%.Wherein, mould is the mould that has cavity, and its shape is set according to actual needs, can be spherical, cylindrical, square column type, perhaps irregular parabola etc.
In the present embodiment, in second step above-mentioned porosity being lower than a foamed aluminium alloy of 70% is positioned in the mould with spherical hollow space, under 700 ℃～1200 ℃ temperature, be incubated 3～40 minutes, make foamed aluminium alloy prefabricated component secondary foamization in mould, with the cooling of the foam aluminium alloy after the foaming, obtaining gabarit is the spheric foamed aluminium alloy product.This foam aluminium alloy spherical zone has epidermis, for some irregular occasions that needs the filled and process aluminium alloy, can fill with the foam aluminium alloy ball with reduced size (as 1cm-5cm) equidimension, and method is simpler.
The method of 6 one kinds of preparing foamed aluminium alloy product by secondary foaming of embodiment comprises following a few step:
The first step: aluminium alloy is heated to fusing, wherein, aluminium alloy such as ZL101, ZL102, the ZL111 series alloy also can be that casting Al-Cu is an alloy, as ZL201, ZL202, ZL205 series alloy, also can be main cupric or main siliceous wrought aluminium alloy, adjust the temperature to 630 ℃-680 ℃, the calcium that adds the 0.5%-5% that is equivalent to aluminium alloy weight be to molten aluminium alloy, the add-on of calcium can be chosen for 0.8%, 1.2%, 1.5%, 2.0%, 2.8%, 3.5%, 4.2%, 4.7%, stirred 1-30 minute, churning time can be chosen for 3 minutes, and 8 minutes, 10 minutes, 15 minutes, 22 minutes, 25 minutes, stirring velocity can be 300～600rpm, adds the titanium hydride of the 0.5%-5% that is equivalent to aluminium alloy weight again, and the add-on of titanium hydride can be chosen for 0.8%, 1.2%, 1.5%, 2.0%, 2.8%, 3.5%, 4.2%, 4.7%, stirred 60～1000 seconds with the speed of 800～5000rpm, for example, stirring velocity can be chosen for, 4500rpm, 4000rpm, 3200rpm, 2500rpm, 1000rpm, 900rpm, churning time can be chosen for 70s, 90s, 150s, 250s, 400s, 550s, 600s, 800s, 900s is evenly distributed titanium hydride in melt, with the melt cooling after stirring, obtain porosity and be lower than a foam aluminium alloy prefabricated component of 70%, for example porosity is 60%, 54%, 52%, 45%, 39%, 35%, 28%, 22%, 18%, 15%;
Second step: above-mentioned porosity is lower than a foamed aluminium alloy prefabricated component of 70% and puts into mould, and under 700 ℃～1200 ℃ temperature, be incubated 3～40 minutes, wherein, temperature can be chosen for 750 ℃, 800 ℃, 850 ℃, 880 ℃, 950 ℃, 1000 ℃, 1150 ℃, make foamed aluminium alloy prefabricated component secondary foamization in mould, with the cooling of the foam aluminium alloy after the foaming, obtain foamed aluminium alloy product.Wherein, mould is the mould that has cavity, and its shape is set according to actual needs, can be spherical, cylindrical, square column type, perhaps irregular parabola etc.
In the present embodiment, after the first step, built-in fitting is implanted above-mentioned porosity to be lower than in 70% the foamed aluminium alloy prefabricated component, and prefabricated component is positioned in the mould, under 700 ℃～1200 ℃ temperature, be incubated 3～40 minutes, make and foamed aluminium alloy prefabricated component secondary foamization in mould, obtain to have the foamed aluminium alloy product of built-in fitting the cooling of the foam aluminium alloy after the foaming.This built-in fitting can be internal thread, and screw hole etc., material are steel, copper normally, has the fusing point higher than aluminium.
Claims (6)
1. the method for a preparing foamed aluminium alloy product by secondary foaming is characterized in that comprising following a few step:
The first step: aluminium alloy is heated to fusing, and adjust the temperature to 630 ℃-680 ℃, the calcium that adds the 0.5%-5% that is equivalent to aluminium alloy weight is to molten aluminium alloy, stirred 1-30 minute, the titanium hydride that adds the 0.5%-5% that is equivalent to aluminium alloy weight again, stirring is evenly distributed titanium hydride in melt, the melt cooling with after stirring obtains porosity and is lower than a foam aluminium alloy prefabricated component of 70%;
Second step: above-mentioned porosity is lower than a foamed aluminium alloy prefabricated component of 70% and puts into mould, and under 700 ℃～1200 ℃ temperature, be incubated 3～40 minutes, make foamed aluminium alloy prefabricated component secondary foamization in mould, with the cooling of the foam aluminium alloy after the foaming, obtain foamed aluminium alloy product.
2. the method for preparing foamed aluminium alloy product by secondary foaming according to claim 1 is characterized in that the mould in second step has the complicated shape inner chamber.
3. the method for preparing foamed aluminium alloy product by secondary foaming according to claim 1, it is characterized in that, above-mentioned porosity being lower than a foamed aluminium alloy prefabricated component of 70% in second step does surperficial deoxygenation and handles, aluminium sheet that surperficial deoxygenation was handled or the aluminium alloy plate surface that is positioned over prefabricated component puts it in the mould and heats then.
4. the method for preparing foamed aluminium alloy product by secondary foaming according to claim 3 is characterized in that, in prefabricated component heat-processed, with rare gas element prefabricated component is protected.
5. the method for preparing foamed aluminium alloy product by secondary foaming according to claim 1 is characterized in that the dies cavity in second step is sphere.
6. the method for preparing foamed aluminium alloy product by secondary foaming according to claim 1, it is characterized in that, at first built-in fitting implanted above-mentioned porosity and be lower than in 70% the foamed aluminium alloy prefabricated component, and the prefabricated component that will have a built-in fitting is positioned over heating secondary foamization in the mould in second step.
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100460536C (en) * | 2007-06-05 | 2009-02-11 | 东南大学 | Method of preparing infusible hollow heteromorphic foam aluminum alloy by secondary foam |
| CN100449017C (en) * | 2007-06-08 | 2009-01-07 | 东南大学 | Method for producing resolvable hollow deformed foam aluminium alloy by secondary foaming |
| CN102145568A (en) * | 2010-02-05 | 2011-08-10 | 孙振忠 | Process for preparing foamed aluminum core part with ultrathin structure |
| CN103451492A (en) * | 2013-09-06 | 2013-12-18 | 丹阳市国美汽配有限公司 | Foamed aluminum material for vehicle bumper and preparation method thereof |
| CN106222469A (en) * | 2016-09-14 | 2016-12-14 | 郑州峰泰纳米材料有限公司 | The preparation method of enhancement mode foam aluminium alloy |
| CN106735248B (en) * | 2016-12-02 | 2019-06-11 | 昆明理工大学 | A kind of vacuum foam preparation method of aluminium foam sandwich plate |
| CN107245611B (en) * | 2017-06-19 | 2018-06-19 | 界首市中源汽车修造有限公司 | A kind of automobile foam aluminium plate and its foam process |
| CN111434788B (en) * | 2019-01-15 | 2021-10-19 | 杨怡虹 | Production and preparation method of composite foamed aluminum material |
| CN109778036B (en) * | 2019-03-04 | 2020-10-16 | 东南大学 | Foam alloy for foaming in space environment and preparation method thereof |
| CN111974973A (en) * | 2020-07-02 | 2020-11-24 | 中信戴卡股份有限公司 | Manufacturing method of aluminum alloy casting and automobile anti-collision beam applying aluminum alloy casting |
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| CN1598020A (en) * | 2004-08-11 | 2005-03-23 | 东南大学 | Process for controlling foamed aluminium and its alloy identical pore rate and homogenization |
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| CN1598020A (en) * | 2004-08-11 | 2005-03-23 | 东南大学 | Process for controlling foamed aluminium and its alloy identical pore rate and homogenization |
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