CN106514033A - Aluminum alloy, heat exchanger, aluminum alloy composite and preparation method of aluminum alloy composite - Google Patents
Aluminum alloy, heat exchanger, aluminum alloy composite and preparation method of aluminum alloy composite Download PDFInfo
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- CN106514033A CN106514033A CN201610987156.2A CN201610987156A CN106514033A CN 106514033 A CN106514033 A CN 106514033A CN 201610987156 A CN201610987156 A CN 201610987156A CN 106514033 A CN106514033 A CN 106514033A
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/28—Selection of soldering or welding materials proper with the principal constituent melting at less than 950 degrees C
- B23K35/286—Al as the principal constituent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/40—Making wire or rods for soldering or welding
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/043—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with silicon as the next major constituent
Abstract
The invention discloses an aluminum alloy, an aluminum alloy composite for CAB brazing, a preparation method of the aluminum alloy composite and a heat exchanger made of the aluminum alloy composite. The aluminum alloy comprises, by mass percentage, 0.1%-0.3% of Mg, 1.0%-1.8% of Mn, 0.01%-1.0% of Si, 0.2%-0.9% of Cu, 0.1%-0.7% of Fe, not larger than 0.02% of Ti, not larger than 0.13% of Zr, and the balance Al and inevitable impurities. The aluminum alloy composite prepared by the novel aluminum alloy as a core material is high in post-welding strength and can be used for CAB brazing.
Description
Technical field
The present invention relates to soldering Al alloy composite, and in particular to a kind of novel aluminum alloy, CAB pricker welding aluminum alloys
Composite and preparation method thereof and the heat exchanger prepared with the Al alloy composite.
Background technology
Aluminium alloy has rich reserves, high-strength matter ratio, a good corrosion resistance, the superiority such as heat transfer coefficient is high and easy to process
Can, which is widely used in heat exchanger field as transfer material.At present, tend to become strong engineer applied field light-weighted demand day
Strong, developing lighter and thinner aluminum heat exchanger becomes important research direction.Want so that aluminum heat exchanger weight saving and
Thickness is thinning, and corresponding brazed aluminum alloy composite is accomplished by with higher intensity under same load or stress condition,
To prevent which from deforming even cracking during follow-up brazing process or use.Therefore, the soldering for developing higher deposited strength is used
Al alloy composite has become when the focus in front heat exchanger manufacture field.
As the addition of Mn (manganese), 3 ××× line aluminium alloys are provided with preferable elevated temperature strength, most typical representative is
AA3003 aluminium alloys.The soldering work piece prepared by 3 ××× line aluminium alloys is unlikely to deform under the high temperature conditions, bending after its soldering
Intensity is taken typically in 40-60MPa, is frequently utilized for preparing heat exchanger.With the requirement more and more higher to material, AA3003 is not
Requirement of the heat exchanger to intensity can be met.At present, generally by addition Cu (copper) and increase Mn content improve postwelding
Intensity.
The content of Cu is from improving postwelding yield strength to 1.8%, AA3003 also from most from 1% without bringing up to 0.9%, Mn
First 40-45MPa improves 55MPa-60MPa till now.Continuing to improve Cu contents to cause serious transcrystalline corrosion, and Mn
Solid solubility limit is arrived, continuation raising can then produce thick primary phase and can then deteriorate processing characteristics.In brief, the content of Cu and Mn
No any regulatable space.
Additionally, Mg (magnesium) can also be added toward 3xxx systems alloy, this is when a main trend of front heat exchanger aluminium development.
Mg elements can be obviously improved the strength character of 3xxx line aluminium alloys, and 0.3%-0.5%Mg can cause the strong of 3xxx line aluminium alloys
Degree improves about 20%.But, the vapour pressure of Mg is big, and during soldering, Mg is easily heated and is evaporated from alloy, diffusion
MgO (magnesium oxide) is formed to aluminum alloy surface.The Al of the MgO and aluminium surface2O3The dissolubility of (aluminium sesquioxide) in brazing flux
It is extremely low, not readily dissolve, therefore the mobility of solder can be substantially reduced.Additionally, Mg also easily forms MgF with brazing flux2(Afluon (Asta)),
KMgF3(potassium fluoride magnesium), K2MgF4Compounds such as (tetrafluoride dipotassium magnesium), makes brazing flux fusing point raise and lose activity.Therefore, contain
The parts of Mg are generally not suitable for being connected using CAB solderings (protective atmosphere soldering can be referred to as carrier gas soldering) mode again
Connect, and need to adopt vacuum brazing mode.Although vacuum brazing can obtain high-quality device, but its production process is necessary
In nearly vacuum state (3.5 × 10-3Pa heat up in closed body of heater) soldering, and production efficiency is extremely low.And CAB solderings are then only needed to
Using inert gas shielding, it is possible to achieve continuous to produce, its production efficiency is high.Additionally, the defective products of CAB solderings can carry out two
Secondary soldering, therefore its high yield rate is up to 99%.
The content of the invention
The invention aims to solving existing Al alloy composite can not meet brazed aluminum conjunction as thickness is thinning
Metal/composite material intensity requirement and the problem that causes.
Present invention firstly provides a kind of novel aluminum alloy, each composition quality percent of the novel aluminum alloy is as follows：
Magnesium is 0.1%-0.3%, and manganese is 1.0%-1.8%, and silicon (Si) is 0.01%-1.0%, and copper is 0.2%-0.9%, and ferrum (Fe) is
0.1%-0.7%, titanium (Ti)≤0.02%, zirconium (Zr)≤0.13%, remaining is aluminum (Al) and inevitable impurity.
In one embodiment of the invention, the mass percent of the Mg is 0.15%-0.25%.
In one embodiment of the invention, the mass percent of the Mn is 1.3%-1.6%.
In one embodiment of the invention, the mass percent of the Si is 0.2%-0.7%.
In one embodiment of the invention, the mass percent of the Cu is 0.4%-0.8%.
In one embodiment of the invention, the mass percent of the Fe is 0.2%-0.4%.
On this basis, present invention also offers a kind of CAB solderings Al alloy composite, the CAB solderings aluminum
Alloy composite materials have three layers of aluminium alloy, and top layer is AA4045 aluminium alloys, and middle level is arbitrary described aluminum conjunction in claim 1-6
Gold, bottom are AA4045 aluminium alloys or AA7072 aluminium alloys；The thickness ratio of three layers of aluminium alloy is 1:7:1-1:12:1.
Present invention also offers a kind of method for preparing above-mentioned CAB solderings Al alloy composite, methods described includes
Following steps：
Alloy casting：Three layers of aluminium alloy is cast using DC casting (direct water-cooling semi-continuous casting) methods；
Compound pre-treatment：The aluminium alloy of top layer and bottom after casting is surface-treated, and by the aluminium alloy in middle level
The milling face of carrying out process；Again three layers of aluminium alloy is processed to required size；
Method hot rolling：Aluminium alloy after process is stacked in order and fixed, is preheated in 450 DEG C of -550 DEG C of temperature,
Preheating 7h-17h；Three layers of aluminum alloy heat is rolled to gross thickness for 5mm-10mm by method hot rolling after preheating, and finishing temperature >=
300℃；Clot air cooling again；
It is cold rolling：Three layers of aluminium alloy after by hot rolling carry out repeatedly it is cold rolling, until rolling desired thickness；
Annealing：Cold rolling finished product aluminium strip is carried out into incomplete recrystallization annealing at 300 DEG C -400 DEG C, makes product remain half
Hard state (H24 states).
In one embodiment of the invention, during cold rolling, total cold roller and deformed rate >=90%.
Present invention also offers a kind of heat exchanger, the heat exchanger is by above-mentioned Al alloy composite by CAB prickers
Weld and be obtained.
The present invention on the basis of the optimization constituent content such as Cu, Si, Mn, by adding a certain amount of Mg elements so that aluminum
Alloy in hot-working, heat treatment and brazing process generates optimal reinforcing by solution strengthening and second-phase strength mode and makees
With can be used for preparing that deposited strength is high, the Al alloy composite of thickness of thin.
Secondly, the novel aluminum alloy Mg contents that the present invention is provided are few, the aluminium alloy compound prepared as core by which
Material deposited strength is high.And the Al alloy composite is adapted to using CAB solderings, so as to improve the production efficiency of its product
And yield rate.
Additionally, the intensity of the heat exchanger of present invention offer is very high.
Description of the drawings
The structural representation of the CAB soldering Al alloy composites that Fig. 1 is provided for the present invention.
Fig. 2 is the process chart that the embodiment of the present invention prepares CAB soldering Al alloy composites.
In figure：
1：Top layer；2：Middle level；3：Bottom.
Specific embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in more details, so as to energy
The advantage of the solution of the present invention and its various aspects is more fully understood enough.However, specific embodiments described below and enforcement
Example is only descriptive purpose, rather than limitation of the present invention.
Present invention firstly provides a kind of novel aluminum alloy, each composition quality percent of the aluminium alloy is as follows：Mg is
0.1%-0.3%, Mn are 1.0%-1.8%, and Si is 0.01%-1.0%, and Cu is 0.2%-0.9%, and Fe is 0.1%-0.7%,
Ti≤0.02%, Zr≤0.13%, inevitable impurity≤0.15%, remaining is Al.
The aluminium alloy that the present invention is provided is modified AA3003 aluminium alloys (lower section is referred to as AA3003Mod aluminium alloys),
The content of the elements such as Cu, Si, Mn is optimized on the basis of AA3003 alloying components, and adds a certain amount of Mg elements so that should
Aluminium alloy generates optimal reinforcing by solution strengthening and second-phase strength mode in hot-working, heat treatment and brazing process
Effect.
Mg mainly improves the deposited strength of the aluminium alloy in the way of solution strengthening.Additionally, Mg can be also formed with Si
Mg2Si intermetallic compounds, produce the effect of ageing strengthening.The addition of Mg is 0.1%-0.3%, and its addition is preferably
0.15%-0.25%.More than 0.3%, in CAB brazing process, Mg easily diffuses to interface and makes brazing flux lose activity, so as to
It cannot be guaranteed that CAB soldering effects；Less than 0.1%, reinforcing effect is inadequate.
Mn is the main adding elements of 3xxx line aluminium alloys, and which mainly passes through second-phase strength and solution strengthening improves alloy
Deposited strength.The addition of Mn is 1.0%-1.8%, preferably 1.3%-1.6%.More than 1.8%, then can be formed thick
Primary phase containing Mn, deteriorates the machine-shaping property of material；And be less than 1.0%, then strengthen not sufficiently effective.
Si can form the Al-Mn-Si disperse phases of submicron order with Mn, reduce the solid solubility of Mn in matrix, improve aluminium alloy
Heat conductivity, while can also improve the intensity of aluminium alloy.The content of Si is less than 0.01%, then the effect above is not enough；And be higher than
1.0%, then the fusing point of aluminium alloy can be caused to reduce.Its optimized scope is 0.2%-0.7%.
Cu mainly improves intensity in the way of solution strengthening.When the content of Cu is less than 0.2%, strengthen DeGrain；And
If being higher than 0.9%, the decay resistance of aluminium alloy can be caused to decline.Its optimized scope is 0.4%-0.8%.
Fe can form submicron order the second phases of Al-Mn-Fe-Si with Mn, Si, improve intensity, meanwhile, can also reduce Mn's
Solid solubility, improves the heat conductivity of aluminium alloy.When Fe contents are less than 0.1%, manufacturing cost rises；And when being higher than 0.7%, then can
Thick Al-Fe-Mn-Si primary phases are formed, causes processing characteristics to deteriorate.Its optimized scope is 0.2-0.4%.
The novel aluminum alloy that the present invention is provided, to prepare, deposited strength is high, thickness of thin Al alloy composite is provided
Condition.
On this basis, present invention also offers a kind of CAB solderings Al alloy composite, the CAB solderings are closed with aluminum
Metal/composite material has three layers of aluminium alloy, and top layer is AA4045 aluminium alloys, and middle level is AA3003Mod aluminium alloys, and bottom is AA4045
Aluminium alloy or AA7072 aluminium alloys；The thickness of the CAB soldering Al alloy composites is 0.2mm-0.3mm；Three layers of aluminium alloy
Thickness ratio be 1:7:1-1:12:1.
Fig. 1 is the structural representation of the CAB soldering Al alloy composites.Wherein, 1 is top layer, and 2 is middle level, and 3 is bottom
Layer.AA4045 aluminium alloys and AA7072 aluminium alloys are the conventional cortical materials of soldering Al alloy composite, in the present invention, top
Layer is AA4045 aluminium alloys, and bottom is AA4045 aluminium alloys or AA7072 aluminium alloys.
, the thickness of conventional heat exchanger raw material is 0.2mm-0.3mm at present, and this aluminium alloy for providing of the invention is multiple
Condensation material can be 0.2-0.3mm.Further, since above-mentioned Novel aluminum alloy material has been used, therefore, it is this that the present invention is provided
The thickness of Al alloy composite in fact can also be further thinning, as long as the requirement of manufactured equipment can be met.
The middle level of the CAB soldering Al alloy composites that the present invention is provided is AA3003Mod aluminium alloys, its Mg content
Few, in CAB brazing process, Mg is not easy to diffuse to interface and make brazing flux lose activity, and intensity is high, either in soldering
All without situation about being deformed or ftracture during process or use.
Present invention also offers a kind of method for preparing above-mentioned CAB solderings Al alloy composite.As shown in Fig. 2 should
Method comprises the steps：
Alloy casting：Three layers of aluminium alloy are cast using DC casting (direct water-cooling semi-continuous casting) methods；
Compound pre-treatment：The aluminium alloy of top layer and bottom after casting is surface-treated, is then reprocessed to required
Size, and the aluminium alloy in middle level is carried out into the process of milling face to required size；
Method hot rolling：Aluminium alloy after process is stacked in order and fixed, is preheated in 450 DEG C of -550 DEG C of temperature,
Preheating 7h-17h；Three layers of aluminum alloy heat are rolled to gross thickness for 5mm-10mm, finishing temperature >=300 by method hot rolling after preheating
℃；Clot air cooling again；
It is cold rolling：Three layers of aluminium alloy after by hot rolling carry out repeatedly it is cold rolling, until rolling desired thickness；
Annealing：Cold rolling finished product aluminium strip is carried out into incomplete recrystallization annealing at 300 DEG C -400 DEG C, makes product remain half
Hard state (H24 states).
Wherein, during cold rolling, the total cold roller and deformed rate of three layers of aluminium alloy needs >=90%.It is cold rolling to improve aluminum conjunction
The intensity and hardness of golden material.When cold rolling, the deformation rate of aluminium alloy is larger to the performance impact of aluminium alloy.Deformation rate is higher, aluminum
The tissue of alloy is more uniform tiny, and its mechanical property also can be improved well.
The concrete technology of surface treatment is not required to it was determined that can arbitrarily be adjusted according to produce reality situation.Top layer and bottom
After the aluminum alloy surface of layer is processed, desired thickness is first hot-rolled down to, then is cut to Len req.
Present invention also offers a kind of heat exchanger, the heat exchanger is by above-mentioned Al alloy composite by CAB solderings
And be obtained.
The heat exchanger that the present invention is provided has used above-mentioned Al alloy composite, therefore, intensity is very good.
Below with reference to specific embodiment, the present invention will be described.In following embodiments, institute's taking technique condition value is
Exemplary, its desirable numerical range is as shown in foregoing summary.Detection method used by following embodiments and comparative example
It is the conventional detection method of the industry.
Embodiment 1
The present embodiment provides a kind of Al alloy composite of three-decker, and its structure is as shown in Figure 1.Middle level is
AA3003Mod aluminium alloys, top layer and bottom are all AA4045 aluminium alloys.The quality percentage of each composition in AA3003Mod aluminium alloys
Number is as follows：Mn be 1.5%, Mg be 0.2%, Si be 0.1%, Fe be 0.32%, Cu be 0.76%, Ti be that 0.02%, Zr is
0.1%, remaining is Al and inevitable impurity.
Its preparation process is as shown in Fig. 2 specific as follows：
1) alloy casting：AA4045 aluminium alloys and AA3003Mod aluminium alloys are cast using DC forging types, cast ingot dimension is equal
For 450 × 1120 × 5100mm.
2) it is combined pre-treatment：AA4045 aluminium alloys are surface-treated, and AA3003Mod aluminium alloys are carried out into milling face place
Manage to 419mm；AA4045 aluminum alloy heats after surface treated are rolled to 42.5mm, then divide equally and are broken into 5100mm length.
3) method hot rolling：According to AA4045 aluminium alloys, AA3003Mod aluminium alloys, AA4045 aluminium alloys order from upper and
Under stack and fixed, be heated to 480 DEG C and be incubated 12h, then to 8mm, finishing temperature is 300 DEG C to Jing multistage hot deformations, then
Clot air cooling.
3) it is cold rolling：Jing is cold-rolled to 0.27mm many times.
4) anneal：Cold rolling coil is incubated into 4h in 360 DEG C of annealing furnaces, air cooling obtains Al alloy composite.
By the Al alloy composite for preparing simulation CAB soldering detections, simulation soldering processes it is：Jing 24min are warming up to
600 DEG C, 10min is incubated, protective atmosphere is argon.Mechanical property before and after soldering is as shown in table 1.
Embodiment 2
The present embodiment provides a kind of Al alloy composite of three-decker, and its structure is as shown in Figure 1.Middle level is
AA3003Mod aluminium alloys, top layer are AA4045 aluminium alloys, and bottom is AA7072 aluminium alloys.Wherein, in AA3003Mod aluminium alloys
The mass percent of each composition is as follows：Mn be 1.36%, Mg be 0.18%, Si be 0.3%, Fe be 0.3%, Cu be 0.7%, Ti
It is 0.09% for 0.01%, Zr, remaining is Al and inevitable impurity.
Its preparation process is as shown in Fig. 2 specific as follows：
1) alloy casting：Closed using DC forging types casting AA4045 aluminium alloys, AA7072 aluminium alloys and AA3003Mod aluminum
Gold, cast ingot dimension are 450 × 1120 × 5100mm.
2) it is combined pre-treatment：AA4045 aluminium alloys, AA7072 aluminium alloys are surface-treated, and by AA3003Mod aluminum
Alloy carries out the process of milling face to 420mm；AA4045 aluminium alloys and AA7072 aluminum alloy heats after surface treated is rolled to 42mm, so
Divide equally afterwards and be broken into 5100mm length.
3) method hot rolling：According to AA4045 aluminium alloys, AA3003Mod aluminium alloys, AA7072 aluminium alloys order from upper and
Under stack and fixed, be heated to 470 DEG C and be incubated 14h, then to 7mm, finishing temperature is 350 DEG C to Jing multistage hot deformations, then
Clot air cooling.
3) it is cold rolling：Jing is cold-rolled to 0.23mm many times.
4) anneal：Cold rolling coil is incubated into 3h in 330 DEG C of annealing furnaces, air cooling obtains Al alloy composite.
By the Al alloy composite for preparing simulation CAB soldering detections, simulation soldering processes it is：Jing 24min are warming up to
600 DEG C, 10min is incubated, protective atmosphere is argon.Mechanical property before and after soldering is as shown in table 2.
Embodiment 3
The present embodiment provides a kind of Al alloy composite of three-decker, and its structure is as shown in Figure 1.Middle level is
AA3003Mod aluminium alloys, top layer and bottom are all AA4045 aluminium alloys.Wherein, in AA3003Mod aluminium alloys each composition quality
Percent is as follows：Mn be 1.8%, Mg be 0.15%, Si be 0.7%, Fe be 0.4%, Cu be 0.2%, Ti be that 0.02%, Zr is
0.13%, remaining is Al and inevitable impurity.
Its preparation process is as shown in Fig. 2 specific as follows：
1) alloy casting：AA4045 aluminium alloys and AA3003Mod aluminium alloys are cast using DC forging types, cast ingot dimension is equal
For 450 × 1120 × 5100mm.
2) it is combined pre-treatment：AA4045 aluminium alloys are surface-treated, and AA3003Mod aluminium alloys are carried out into milling face place
Manage to 422mm；AA4045 aluminum alloy heats after surface treated are rolled to 41.5mm, then divide equally and are broken into 5100mm length.
3) method hot rolling：According to AA4045 aluminium alloys, AA3003Mod aluminium alloys, AA4045 aluminium alloys order from upper and
Under stack and fixed, be heated to 450 DEG C and be incubated 17h, then to 5mm, finishing temperature is 300 DEG C to Jing multistage hot deformations, then
Clot air cooling.
3) it is cold rolling：Jing is cold-rolled to 0.23mm many times.
4) anneal：Cold rolling coil is incubated into 3h in 300 DEG C of annealing furnaces, air cooling obtains Al alloy composite.
By the Al alloy composite for preparing simulation CAB soldering detections, simulation soldering processes it is：Jing 24min are warming up to
600 DEG C, 10min is incubated, protective atmosphere is argon.Mechanical property before and after soldering is as shown in table 3.
Embodiment 4
The present embodiment provides a kind of Al alloy composite of three-decker, and its structure is as shown in Figure 1.Middle level is
AA3003Mod aluminium alloys, top layer are AA4045 aluminium alloys, and bottom is AA7072 aluminium alloys.Wherein, AA3003Mod aluminium alloys are each
The mass percent of composition is as follows：Mn be 1.3%, Mg be 0.3%, Si be 1.0%, Fe be 0.1%, Cu be that 0.8%, Ti is
0.01%, Zr are 0.06%, and remaining is Al and inevitable impurity.
Its preparation process is as shown in Fig. 2 specific as follows：
1) alloy casting：Closed using DC forging types casting AA4045 aluminium alloys, AA7072 aluminium alloys and AA3003Mod aluminum
Gold, cast ingot dimension are 450 × 1120 × 5100mm.
2) it is combined pre-treatment：AA4045 aluminium alloys, AA7072 aluminium alloys are surface-treated, and by AA3003Mod aluminum
Alloy carries out the process of milling face to 413mm；AA4045 aluminium alloys and AA7072 aluminum alloy heats after surface treated is rolled to 59mm, so
Divide equally afterwards and be broken into 5100mm length.
3) method hot rolling：According to AA4045 aluminium alloys, AA3003Mod aluminium alloys, AA7072 aluminium alloys order from upper and
Under stack and fixed, be heated to 550 DEG C and be incubated 7h, then to 10mm, finishing temperature is 330 DEG C to Jing multistage hot deformations, then
Clot air cooling.
3) it is cold rolling：Jing is cold-rolled to 0.23mm many times.
4) anneal：Cold rolling coil is incubated into 5h in 400 DEG C of annealing furnaces, air cooling obtains Al alloy composite.
By the Al alloy composite for preparing simulation CAB soldering detections, simulation soldering processes it is：Jing 24min are warming up to
600 DEG C, 10min is incubated, protective atmosphere is argon.Mechanical property before and after soldering is as shown in table 4.
Embodiment 5
The present embodiment provides a kind of Al alloy composite of three-decker, and its structure is as shown in Figure 1.Middle level is
AA3003Mod aluminium alloys, top layer and bottom are all AA4045 aluminium alloys.Wherein, in AA3003Mod aluminium alloys each composition quality
Percent is as follows：Mn be 1.6%, Mg be 0.1%, Si be 0.01%, Fe be 0.7%, Cu be 0.4%, Ti be that 0.01%, Zr is
0.03%, remaining is Al and inevitable impurity.
Its preparation process is as shown in Fig. 2 specific as follows：
1) alloy casting：AA4045 aluminium alloys and AA3003Mod aluminium alloys are cast using DC forging types, cast ingot dimension is equal
For 450 × 1120 × 5100mm.
2) it is combined pre-treatment：AA4045 aluminium alloys are surface-treated, and AA3003Mod aluminium alloys are carried out into milling face place
Manage to 426mm；AA4045 aluminum alloy heats after surface treated are rolled to 35.5mm, then divide equally and are broken into 5100mm length.
3) method hot rolling：According to AA4045 aluminium alloys, AA3003Mod aluminium alloys, AA4045 aluminium alloys order from upper and
Under stack and fixed, be heated to 520 DEG C and be incubated 9h, then to 6mm, finishing temperature is 340 DEG C to Jing multistage hot deformations, is then beaten
Volume air cooling.
3) it is cold rolling：Jing is cold-rolled to 0.23mm many times.
4) anneal：Cold rolling coil is incubated into 4.5h in 330 DEG C of annealing furnaces, air cooling obtains Al alloy composite.
By the Al alloy composite for preparing simulation CAB soldering detections, simulation soldering processes it is：Jing 24min are warming up to
600 DEG C, 10min is incubated, protective atmosphere is argon.Mechanical property before and after soldering is as shown in table 5.
Embodiment 6
The present embodiment provides a kind of Al alloy composite of three-decker, and its structure is as shown in Figure 1.Middle level is
AA3003Mod aluminium alloys, top layer are AA4045 aluminium alloys, and bottom is AA7072 aluminium alloys.Wherein, in AA3003Mod aluminium alloys
The mass percent of each composition is as follows：Mn be 1.0%, Mg be 0.25%, Si be 0.2%, Fe be 0.2%, Cu be 0.9%, Ti
It is 0.04% for 0.01%, Zr, remaining is Al and inevitable impurity.
Its preparation process is as shown in Fig. 2 specific as follows：
1) alloy casting：Closed using DC forging types casting AA4045 aluminium alloys, AA7072 aluminium alloys and AA3003Mod aluminum
Gold, cast ingot dimension are 450 × 1120 × 5100mm.
2) it is combined pre-treatment：AA4045 aluminium alloys, AA7072 aluminium alloys are surface-treated, and by AA3003Mod aluminum
Alloy carries out the process of milling face to 417mm；AA4045 aluminum alloy heats and AA7072 aluminum alloy rollings after surface treated to 37.9mm,
Then divide equally and be broken into 5100mm length.
3) method hot rolling：According to AA4045 aluminium alloys, AA3003Mod aluminium alloys, AA7072 aluminium alloys order from upper and
Under stack and fixed, be heated to 480 DEG C and be incubated 11h, then to 8mm, finishing temperature is 340 DEG C to Jing multistage hot deformations, then
Clot air cooling.
3) it is cold rolling：Jing is cold-rolled to 0.23mm many times.
4) anneal：Cold rolling coil is incubated into 3.5h in 340 DEG C of annealing furnaces, air cooling obtains Al alloy composite.
By the Al alloy composite for preparing simulation CAB soldering detections, simulation soldering processes it is：Jing 24min are warming up to
600 DEG C, 10min is incubated, protective atmosphere is argon.Mechanical property before and after soldering is as shown in table 6.
The performance of the Al alloy composite prepared by 1 embodiment 1 of table
| State | Thickness/mm | Yield strength/MPa | Tensile strength/MPa | Elongation percentage/% |
| Before soldering | 0.27 | 187.6 | 231.4 | 12.1 |
| After soldering | 0.27 | 73 | 180 | 7.7 |
The performance of the Al alloy composite prepared by 2 embodiment 2 of table
| State | Thickness/mm | Yield strength/MPa | Tensile strength/MPa | Elongation percentage/% |
| Before soldering | 0.23 | 187 | 232.2 | 12 |
| After soldering | 0.23 | 68 | 162 | 11.8 |
The performance of the Al alloy composite prepared by 3 embodiment 3 of table
| State | Thickness/mm | Yield strength/MPa | Tensile strength/MPa | Elongation percentage/% |
| Before soldering | 0.23 | 185.2 | 224.3 | 10.9 |
| After soldering | 0.23 | 71.3 | 178.4 | 8.7 |
The performance of the Al alloy composite prepared by 4 embodiment 4 of table
| State | Thickness/mm | Yield strength/MPa | Tensile strength/MPa | Elongation percentage/% |
| Before soldering | 0.23 | 175.1 | 213.1 | 12.7 |
| After soldering | 0.23 | 73.4 | 184.7 | 9.5 |
The performance of the Al alloy composite prepared by 5 embodiment 5 of table
| State | Thickness/mm | Yield strength/MPa | Tensile strength/MPa | Elongation percentage/% |
| Before soldering | 0.23 | 182.2 | 220.1 | 11.7 |
| After soldering | 0.23 | 75.3 | 186.5 | 8.1 |
The performance of the Al alloy composite prepared by 6 embodiment 6 of table
| State | Thickness/mm | Yield strength/MPa | Tensile strength/MPa | Elongation percentage/% |
| Before soldering | 0.23 | 187 | 217 | 13 |
| After soldering | 0.23 | 74.1 | 176.8 | 8.0 |
The Al alloy composite prepared by AA4045 aluminium alloys, AA7072 aluminium alloys and AA3003 aluminium alloys is in soldering
Yield strength afterwards is essentially 40MPa-55MPa.From table 1 to table 6 as can be seen that the aluminum that embodiment 1 to embodiment 6 is prepared is closed
Its yield strength is significantly improved metal/composite material compared to the yield strength of existing Al alloy composite after brazing, greatly
10-15MPa is improve about.As can be seen here, the aluminium alloy compound that novel aluminum alloy provided by the present invention is prepared as core
Material deposited strength is high, is a kind of very superior heat exchanger raw material of performance.
To sum up, the present invention by adding a certain amount of Mg elements, is made on the basis of the constituent contents such as optimization Cu, Si, Mn
Aluminium alloy generated by solution strengthening and second-phase strength mode in hot-working, heat treatment and brazing process it is optimal strong
Change is acted on, and the Al alloy composite for preparation intensity height, thickness of thin provides condition.
Secondly, the novel aluminum alloy Mg contents that the present invention is provided are few, the aluminium alloy compound prepared as core by which
Material deposited strength is high.And the Al alloy composite is adapted to using CAB solderings, so as to improve the production efficiency of its product
And yield rate.
Additionally, the heat exchanger intensity that the present invention is provided is high.
It should be noted that each embodiment above by reference to described by accompanying drawing is only to illustrate rather than restriction originally
The scope of invention, it will be understood by those within the art that, it is right under the premise without departing from the spirit and scope of the present invention
Modification or equivalent that the present invention is carried out, all should cover within the scope of the present invention.Additionally, unless stated otherwise, that
Any embodiment all or part of can with reference to any other embodiment all or part of using.
Claims (10)
1. a kind of aluminium alloy, it is characterised in that each composition quality percent of the aluminium alloy is as follows：Mg is 0.1%-0.3%,
Mn is 1.0%-1.8%, and Si is 0.01%-1.0%, and Cu is 0.2%-0.9%, and Fe is 0.1%-0.7%, Ti≤0.02%,
Zr≤0.13%, remaining is Al and inevitable impurity.
2. aluminium alloy according to claim 1, it is characterised in that the mass percent of the Mg is 0.15%-0.25%.
3. aluminium alloy according to claim 1, it is characterised in that the mass percent of the Mn is 1.3%-1.6%.
4. aluminium alloy according to claim 1, it is characterised in that the mass percent of the Si is 0.2%-0.7%.
5. aluminium alloy according to claim 1, it is characterised in that the mass percent of the Cu is 0.4%-0.8%.
6. aluminium alloy according to claim 1, it is characterised in that the mass percent of the Fe is 0.2%-0.4%.
7. a kind of CAB solderings Al alloy composite, it is characterised in that the CAB solderings Al alloy composite has three
Layer aluminium alloy, top layer are AA4045 aluminium alloys, and middle level is arbitrary described aluminium alloy in claim 1-6, and bottom is AA4045
Aluminium alloy or AA7072 aluminium alloys；The thickness ratio of three layers of aluminium alloy is 1:7:1-1:12:1.
8. a kind of method of the CAB soldering Al alloy composites prepared described in claim 7, methods described include following step
Suddenly：
Alloy casting：Three layers of aluminium alloy is cast respectively using DC castings；
Compound pre-treatment：The aluminium alloy of top layer and bottom after casting is surface-treated, is then reprocessed to required size,
And the aluminium alloy in middle level is carried out into the process of milling face to required size；
Method hot rolling：Aluminium alloy after process is stacked in order and fixed, preheated in 450 DEG C of -550 DEG C of temperature, preheated
7h-17h；Three layers of aluminum alloy heat is rolled to gross thickness for 5mm-10mm, finishing temperature >=300 DEG C by method hot rolling after preheating；
Clot air cooling again；
It is cold rolling：Three layers of aluminium alloy after by hot rolling carry out repeatedly it is cold rolling, until rolling desired thickness；
Annealing：Cold rolling finished product aluminium strip is carried out into incomplete recrystallization annealing at 300 DEG C -400 DEG C, makes product remain semihard shape
State.
9. method according to claim 8, it is characterised in that during cold rolling, three layers of aluminium alloy it is total cold
Roll deformation rate >=90%.
10. a kind of heat exchanger, the heat exchanger are passed through with Al alloy composite by the CAB solderings described in claim 7
CAB solderings and be obtained.
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| CN117305663A (en) * | 2023-11-30 | 2023-12-29 | 中铝材料应用研究院有限公司 | Aluminum alloy plate and preparation method thereof, aluminum alloy welding method and welding joint |
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