CN109909571B - Method for preparing foamed aluminum sandwich plate through electromagnetic ultrasonic brazing - Google Patents
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Abstract
The invention relates to a method for preparing a foamed aluminum sandwich plate by electromagnetic ultrasonic brazing, which comprises the following steps: processing the foamed aluminum and the aluminum plate to be completely consistent in size, polishing, cleaning and drying the surface; preparing a brazing filler metal; finishing brazing filler metal coating on one surface of each aluminum plate and one surface of the foamed aluminum; compounding one side of an aluminum plate coated with brazing filler metal with one side of a foamed aluminum coated with brazing filler metal, placing the aluminum plate and the foamed aluminum in a muffle furnace, heating, adding a static magnetic field in the vertical direction, wherein the static magnetic field is generated by a superconducting magnet, introducing alternating current at two ends of the aluminum plate, applying pressure to the composite structure of the foamed aluminum plate, and fully wetting the brazing filler metal on the surfaces of the aluminum plate and the foamed aluminum under the combined action of the pressure, the electromagnetism and the alternating current; and (3) overturning the welded foamed aluminum plate composite structure, coating the other side of the foamed aluminum plate with the same brazing filler metal, compounding the aluminum plate composite structure with the other aluminum plate coated with the brazing filler metal, and welding to obtain the foamed aluminum sandwich plate. The invention relates to a non-contact ultrasonic method applied to the high-temperature field.
Description
The technical field is as follows:
the invention relates to the field of porous material welding, in particular to a method for preparing a foamed aluminum sandwich plate by electromagnetic ultrasonic brazing.
Background art:
the foamed aluminum sandwich structure composite board is a novel efficient structural material, and has a structure that foamed aluminum is used as a core layer, and an aluminum plate or other metals are used as panel layers. The foamed aluminum sandwich composite plate can be directly used as a military or civil large-scale aviation and aerospace aircraft structure and functional parts (such as vibration-proof seats, shock-resistant bilges, gyro supports and the like), a carriage body of an automobile and a high-speed train, a large military ship and the like, and has definite demand traction and application prospects.
The preparation methods of the foamed aluminum sandwich plate are various, including two major types, namely, firstly obtaining foamed metal by a metal melt foaming method, a powder metallurgy method and the like, and then connecting the foamed metal with a metal plate by different connecting methods. The method is mainly a glue bonding method, but the mechanical property of the foamed aluminum sandwich plate is greatly influenced due to the fact that the adhesive is inactivated and aged at high temperature, and therefore the application of the material at high temperature is greatly limited. The other type is that the preparation of the prefabricated product of the foamed aluminum sandwich board is carried out by a certain method, then the prefabricated product is heated to the melting point of the core part to carry out foaming, and finally the foamed aluminum sandwich board is prepared by cooling. Such as rolling composite-powder metallurgy, but this method requires special dies and is expensive to produce, and suffers from compactness resulting in material defects. Based on the preparation technology of the foamed aluminum sandwich composite board, the brazing is performed to form a new connecting direction of the foamed aluminum sandwich board.
After brazing, residual brazing flux and brazing residues are often left in the foamed aluminum sandwich composite board and cannot be completely removed, so that the use performance of the foamed aluminum sandwich composite board is affected. Ultrasonic joining brazing processes have been developed in the last decade and are becoming more and more widely used in the field of welding. Research has proved that ultrasonic energy is introduced into the brazing process, so that the green environment-friendly welding technology can be realized instead of a brazing flux, and meanwhile, the welding process which is difficult to finish by common brazing can be realized. The piezoelectric effect of the piezoelectric material in the ultrasonic generator can only be generated at a lower temperature, and when the curie temperature is exceeded, the piezoelectric effect disappears, and the ultrasonic cannot be generated.
The invention content is as follows:
the invention aims to provide a method for preparing a foamed aluminum sandwich board by electromagnetic ultrasonic brazing, which is used for solving the problems of poor performance and high cost of a foamed aluminum sandwich composite board prepared by the conventional preparation method of the foamed aluminum sandwich board.
The technical scheme adopted by the invention for solving the technical problems is as follows: the method for preparing the foamed aluminum sandwich plate by electromagnetic ultrasonic brazing comprises the following steps:
firstly, machining foamed aluminum and an aluminum plate to be completely consistent in size by utilizing linear cutting, and polishing, cleaning and drying the surface;
step two, preparing brazing filler metal;
step three, respectively placing the brazing filler metal on one surface of each aluminum plate and one surface of the foamed aluminum obtained in the step one, placing the brazing filler metal in a muffle furnace, heating to melt the brazing filler metal, then respectively uniformly coating the brazing filler metal, cooling the brazing filler metal to room temperature along with the furnace, opening the furnace and taking out the brazing filler metal to finish brazing filler metal coating;
step four, compounding one surface of an aluminum plate coated with the brazing filler metal with one surface of the foamed aluminum coated with the brazing filler metal, clamping the aluminum plate by using a graphite clamp, placing the aluminum plate in a muffle furnace, raising the temperature to 200-600 ℃ at a heating rate of 5-10 ℃/min, then preserving the heat for 1-10 min, adding a static magnetic field in the vertical direction, wherein the static magnetic field is generated by a superconducting magnet, the magnetic induction intensity of the superconducting magnet is 1-12T, alternating current with the frequency of 2-4 kHz is introduced into two ends of the aluminum plate, meanwhile, a certain pressure of 0.1-1 MPa is applied to the composite structure of the foamed aluminum plate, and the brazing filler metal is fully wetted on the surfaces of the aluminum plate and the foamed aluminum under the combined action of the pressure, the electromagnetism;
and step five, overturning the welded foamed aluminum plate composite structure in the step four, then coating brazing filler metal on the other surface of the foamed aluminum by adopting the method in the step three, then performing the step four, compositing the other aluminum plate coated with the brazing filler metal on the other surface of the foamed aluminum, and finally completing welding to obtain the foamed aluminum sandwich plate.
In the first step of the scheme, the surface is polished, cleaned and dried; firstly, polishing the surfaces of foamed aluminum and each aluminum plate step by using water sand paper and metallographic sand paper in a sequence from coarse to fine to remove an oxide film, cleaning for 10-30 min by using acetone, then putting the foamed aluminum and each aluminum plate into a sodium hydroxide aqueous solution, placing the foamed aluminum and each aluminum plate into an ultrasonic cleaning machine, cleaning for 1-5 min, and cleaning for 1-2 min by using a 30% nitric acid aqueous solution, wherein the mass-to-volume ratio of the sodium hydroxide aqueous solution is 30-50 g/L.
The brazing filler metal in the step two of the scheme comprises the following components in percentage by weight: 0.01% -20% of Al, 0.1% -15% of Zn, 20% -70% of Sn, 1% -50% of Ag, 1% -30% of Cu, 0.1% -10% of B and 0.1% -10% of Si.
In the first step of the scheme, the length of the foamed aluminum and the length of the aluminum plate are both 60-100 mm, and the width of the foamed aluminum and the aluminum plate are both 10-50 mm.
The invention has the following beneficial effects:
1. the foamed aluminum sandwich plate structure material is prepared by utilizing the electromagnetic ultrasonic cavitation effect, and the obtained foamed aluminum sandwich plate has good mechanical property.
2. According to the invention, before welding, the surface of the aluminum base material is polished by using sand paper, the surface oxide film is removed, the capillary action of the brazing filler metal is strengthened, and the brazing filler metal is filled in the welding seam more fully. And further removing the residual oxide film on the surface of the aluminum by using an alkaline etching operation under ultrasonic waves.
3. The Sn-Zn brazing filler metal is used, the liquidus temperature is 198-260 ℃, the brazing filler metal temperature and the melting point of foamed aluminum have larger difference, the welding manufacturability is good, the solid solution bonding is carried out on Zn and Al in the brazing filler metal, and simultaneously, a spine-shaped solid solution is grown from the Al surface and inserted into the brazing filler metal for embedding bonding, so that the bonding strength is improved.
4. The invention uses ultrasonic waves generated by an electromagnetic field and alternating current in the brazing process, and removes the oxide film on the surface of the base metal by utilizing the acoustic cavitation effect in the liquid brazing filler metal, thereby realizing the wetting of the liquid brazing filler metal and the base metal.
5. In the invention, the foamed aluminum and the aluminum plate are metallurgically bonded, and compared with adhesive bonding, the aging problem caused by factors such as time and the like does not exist.
6. The invention has simple connection process, low production cost and high production efficiency.
7. The invention can realize the connection of the foamed aluminum core and the aluminum plate with different porosities and different thicknesses, and has better production flexibility.
Fourthly, explanation of the attached drawings:
FIG. 1 is a schematic view of the electromagnetic ultrasonic welding process of the present invention for preparing the foamed aluminum sandwich panel.
In the figure, 1 is a heating device, 2 is foamed aluminum, 3 is a permanent magnet, 4 is a coil, 5 is an alternating current circuit, 6 is an aluminum plate, and 7 is brazing filler metal.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
example 1:
the method for preparing the foamed aluminum sandwich plate by electromagnetic ultrasonic brazing comprises the following steps:
(1) the foamed aluminum and aluminum plates were machined to identical dimensions (length: 60 mm, width: 10 mm) by wire cutting. Firstly, polishing the surfaces of the foamed aluminum 2 and the aluminum plate 6 step by using water sand paper and metallographic sand paper in the sequence from coarse to fine to remove an oxide film, cleaning for 10min by using acetone, then putting the foamed aluminum 2 and the aluminum plate 6 into a sodium hydroxide aqueous solution (50 g/L) and placing the sodium hydroxide aqueous solution and the aluminum plate in an ultrasonic cleaning machine, cleaning for 1 min, then cleaning for 1 min by using a 30% nitric acid aqueous solution, and drying for later use.
(2) Preparing a brazing filler metal 7, wherein the brazing filler metal 7 comprises the following components in percentage by weight: 2% of Al, 12% of Zn, 35% of Sn, 1% of Ag, 30% of Cu, 10% of B and 10% of Si.
(3) And (3) respectively placing the brazing filler metal 7 obtained in the step (2) on one surface of each aluminum plate 6 and one surface of the foamed aluminum 2, placing the aluminum plates and the foamed aluminum in a muffle furnace, heating the brazing filler metal 7 to melt, then respectively and uniformly coating the brazing filler metal on the surfaces of the corresponding aluminum plates 6 and the corresponding foamed aluminum 2, cooling the aluminum plates and the foamed aluminum to room temperature along with the furnace, opening the furnace and taking out the aluminum plates and the foamed aluminum, and thus finishing brazing filler metal coating.
(4) The method comprises the steps of compounding one surface of an aluminum plate coated with brazing filler metal 7 with one surface of foamed aluminum coated with brazing filler metal 7, clamping the aluminum plate by a graphite clamp, placing the aluminum plate in a muffle furnace, raising the temperature to 200 ℃ at a heating rate of 5 ℃/min, keeping the temperature for 1 min, adding a static magnetic field in the vertical direction, wherein the static magnetic field is generated by a superconducting magnet, the magnetic induction intensity of the superconducting magnet is 1T, alternating current with the frequency of 2 kHz is led into two ends of the aluminum plate 6, meanwhile, a certain pressure of 0.1 MPa is applied to the composite structure of the foamed aluminum plate, and thus the brazing filler metal 7 is fully wetted on the surfaces of the aluminum plate 6 and the foamed aluminum 2 under the combined action of the.
(5) Turning over the welded foamed aluminum composite structure obtained in the step (4), coating brazing filler metal 7 on one surface without the aluminum plate by adopting the method in the step (3), and then performing the step (4) with reference to fig. 1, covering an aluminum plate 6 on the other surface of foamed aluminum in the foamed aluminum plate composite structure, specifically: the foamed aluminum composite structure formed by the two aluminum plates is as follows: the foamed aluminum 2 is clamped between the two aluminum plates 6, two surfaces of the foamed aluminum 2 are respectively provided with a layer of brazing filler metal 7, and the surface of each aluminum plate 6 corresponding to the foamed aluminum 2 is also provided with a layer of brazing filler metal 7. Heating by using a heating device 1 in a muffle furnace, heating to 200 ℃ at a heating rate of 5 ℃/min, then preserving heat for 1 min, adding a static magnetic field in the vertical direction, wherein the static magnetic field is generated by a superconducting magnet, a permanent magnet 3 is positioned above a coil 4, the coil 4 is positioned above a foamed aluminum composite structure formed by two aluminum plates, the magnetic induction intensity is 1T, arranging the aluminum plates 6 in an alternating current circuit 5, introducing alternating current with the frequency of 2 kHz at two ends of each aluminum plate 6, and simultaneously applying a certain pressure of 0.1 MPa to the foamed aluminum plate composite structure, so that the brazing filler metal 7 is fully wetted on the surfaces of the aluminum plates 6 and the foamed aluminum 2 under the combined action of the pressure, the electromagnetism and the alternating current, and finally completing welding to obtain the foamed aluminum sandwich plate.
Example 2:
the method for preparing the foamed aluminum sandwich plate by electromagnetic ultrasonic brazing comprises the following steps:
(1) the foamed aluminum 2 and the aluminum plate 6 were processed to have the same size (length: 100mm, width: 50 mm) by wire cutting. Firstly, polishing the surfaces of the foamed aluminum 2 and the aluminum plate 6 step by using water sand paper and metallographic sand paper in a sequence from coarse to fine to remove an oxide film, cleaning for 30min by using acetone, then putting the foamed aluminum 2 and the aluminum plate 6 into a sodium hydroxide aqueous solution (30-50 g/L) and placing the sodium hydroxide aqueous solution and the aluminum plate in an ultrasonic cleaning machine, cleaning for 1-5 min, then cleaning for 1-2 min by using a 30% nitric acid aqueous solution, and drying for later use.
(2) Preparing brazing filler metal, wherein the brazing filler metal 7 comprises the following components in percentage by weight: 0.01% of Al, 1% of Zn, 67% of Sn, 20% of Ag, 10% of Cu, 0.99% of B and 1% of Si.
(3) And (3) respectively placing the brazing filler metal 7 obtained in the step (2) on one surface of each aluminum plate 6 and one surface of the foamed aluminum 2, placing the aluminum plates and the foamed aluminum in a muffle furnace, heating the brazing filler metal 7 to melt, then respectively and uniformly coating the brazing filler metal on the surfaces of the corresponding aluminum plates 6 and the corresponding foamed aluminum 2, cooling the aluminum plates and the foamed aluminum to room temperature along with the furnace, opening the furnace and taking out the aluminum plates and the foamed aluminum, and thus finishing brazing filler metal coating.
(4) The method comprises the steps of compounding one surface of an aluminum plate coated with brazing filler metal 7 with one surface of a foamed aluminum coated brazing filler metal 7, clamping the aluminum plate by a graphite clamping tool, placing the aluminum plate in a muffle furnace, heating to 600 ℃ at a heating rate of 10 ℃/min, keeping the temperature for 10min, adding a static magnetic field in the vertical direction, wherein the static magnetic field is generated by a superconducting magnet, the magnetic induction intensity of the superconducting magnet is 12T, alternating current with the frequency of 4 kHz is led into the two ends of the aluminum plate, meanwhile, a certain pressure of 1MPa is applied to the composite structure of the foamed aluminum-aluminum plate, and thus the brazing filler metal 7 is fully wetted on the surfaces of the aluminum plate 6 and the foamed aluminum 2 under the combined action.
(5) And (3) overturning the welded foamed aluminum composite structure in the step (4), coating brazing filler metal on one surface without the aluminum plate by adopting the method in the step (3), then performing the step (4), covering the other surface of the foamed aluminum in the foamed aluminum plate composite structure with an aluminum plate 6, and finally completing welding to obtain the foamed aluminum sandwich plate.
Example 3:
the method for preparing the foamed aluminum sandwich plate by electromagnetic ultrasonic brazing comprises the following steps:
(1) the foamed aluminum and the aluminum plate were processed to have the same size (length: 80 mm, width: 30 mm) by wire cutting. Firstly, polishing the surfaces of the foamed aluminum 2 and the aluminum plate 6 step by using water sand paper and metallographic sand paper in the sequence from coarse to fine to remove an oxide film, cleaning the surfaces with acetone for 30min, then putting the foamed aluminum 2 and the aluminum plate 6 into a sodium hydroxide aqueous solution (40 g/L) and placing the foamed aluminum 2 and the aluminum plate 6 into an ultrasonic cleaning machine, cleaning for 3 min, then cleaning for 2min with a 30% nitric acid aqueous solution, and drying for later use.
(2) Preparing brazing filler metal, wherein the brazing filler metal 7 comprises the following components in percentage by weight: 20% of Al, 0.9% of Zn, 40% of Sn, 33% of Ag, 1% of Cu, 5% of B and 0.1% of Si.
(3) And (3) respectively placing the brazing filler metal obtained in the step (2) on one surface of each aluminum plate 6 and one surface of the foamed aluminum 2 obtained in the step (I), placing the brazing filler metal in a muffle furnace, heating the brazing filler metal to melt, then respectively and uniformly coating the brazing filler metal on the corresponding surfaces of the aluminum plates 6 and the foamed aluminum 2, cooling the brazing filler metal to room temperature along with the furnace, opening the furnace and taking out the brazing filler metal, and thus finishing brazing filler metal coating.
(4) The method comprises the steps of compounding one surface of an aluminum plate coated with brazing filler metal 7 with one surface of foamed aluminum coated with brazing filler metal 7, clamping the aluminum plate by a graphite clamp, placing the aluminum plate in a muffle furnace, heating to 300 ℃ at a heating rate of 8 ℃/min, keeping the temperature for 7 min, adding a static magnetic field in the vertical direction, wherein the static magnetic field is generated by a superconducting magnet, the magnetic induction intensity of the superconducting magnet is 6T, alternating current with the frequency of 3 kHz is led in at two ends of the aluminum plate 6, meanwhile, a certain pressure of 0.5 MPa is applied to the composite structure of the foamed aluminum plate, and thus the brazing filler metal 7 is fully wetted on the surfaces of the aluminum plate 6 and the foamed aluminum 2 under the combined action of the pressure.
(5) And (3) overturning the welded foamed aluminum composite structure in the step (4), coating brazing filler metal 7 on one surface without the aluminum plate by adopting the method in the step (3), then performing the step (4), covering the other surface of the foamed aluminum in the foamed aluminum plate composite structure with an aluminum plate 6, and finally completing welding to obtain the foamed aluminum sandwich plate.
Example 4:
the method for preparing the foamed aluminum sandwich plate by electromagnetic ultrasonic brazing comprises the following steps:
(1) the foamed aluminum and aluminum plates were machined to identical dimensions (length: 70 mm, width: 20 mm) by wire cutting. Firstly, polishing the surfaces of the foamed aluminum 2 and the aluminum plate 6 step by using water sand paper and metallographic sand paper in the sequence from coarse to fine to remove an oxide film, cleaning the surfaces with acetone for 30min, then putting the foamed aluminum 2 and the aluminum plate 6 into a sodium hydroxide aqueous solution (40 g/L) and placing the foamed aluminum 2 and the aluminum plate 6 into an ultrasonic cleaning machine, cleaning for 3 min, then cleaning for 2min with a 30% nitric acid aqueous solution, and drying for later use.
(2) Preparing brazing filler metal, wherein the brazing filler metal 7 comprises the following components in percentage by weight: 8% Al, 5% Zn, 50% Sn, 20% Ag, 12% Cu, 3% B and 2% Si.
(3) And (3) respectively placing the brazing filler metal 7 obtained in the step (2) on one surface of each aluminum plate 6 and one surface of the foamed aluminum 2, placing the aluminum plates and the foamed aluminum in a muffle furnace, heating the brazing filler metal 7 to melt, then respectively and uniformly coating the brazing filler metal on the surfaces of the corresponding aluminum plates 6 and the corresponding foamed aluminum 2, cooling the aluminum plates and the foamed aluminum to room temperature along with the furnace, opening the furnace and taking out the aluminum plates and the foamed aluminum, and thus finishing brazing filler metal coating.
(4) The method comprises the steps of compounding one surface of an aluminum plate coated with brazing filler metal 7 with one surface of a foamed aluminum coated brazing filler metal 7, clamping the aluminum plate by a graphite clamp, placing the aluminum plate in a muffle furnace, heating to 300 ℃ at a heating rate of 6 ℃/min, keeping the temperature for 8 min, adding a static magnetic field in the vertical direction, wherein the static magnetic field is generated by a superconducting magnet, the magnetic induction intensity of the superconducting magnet is 3T, alternating current with the frequency of 2-4 kHz is led into two ends of the aluminum plate 6, meanwhile, a certain pressure of 0.2 MPa is applied to the composite structure of the foamed aluminum plate, and thus the brazing filler metal is fully wetted on the surfaces of the aluminum plate 6 and the foamed aluminum 2 under the combined action of the pressure.
(5) And (3) overturning the welded foamed aluminum composite structure in the step (4), coating brazing filler metal 7 on one surface without the aluminum plate by adopting the method in the step (3), then performing the step (4), covering the other surface of the foamed aluminum in the foamed aluminum plate composite structure with an aluminum plate 6, and finally completing welding to obtain the foamed aluminum sandwich plate.
The invention relates to a non-contact ultrasonic method which can be applied to the field of high temperature. Electromagnetic ultrasound is a method of directly generating sound waves in molten metal by using high-intensity electromagnetic force, and the sound waves not only have all effects of the traditional sound waves, but also can be used in the high-temperature field in a non-contact manner.
Claims (3)
1. A method for preparing a foamed aluminum sandwich plate by electromagnetic ultrasonic brazing is characterized in that the method for preparing the foamed aluminum sandwich plate by electromagnetic ultrasonic brazing adopts a non-contact ultrasonic method, and specifically comprises the following steps:
firstly, machining the foamed aluminum (2) and the aluminum plate (6) to be completely consistent in size by utilizing linear cutting, and polishing, cleaning and drying the surfaces;
step two, preparing brazing filler metal, wherein the brazing filler metal comprises the following components in percentage by weight: 0.01% -20% of Al, 0.1% -15% of Zn, 20% -70% of Sn, 1% -50% of Ag, 1% -30% of Cu, 0.1% -10% of B and 0.1% -10% of Si;
thirdly, respectively placing the brazing filler metal (7) on one surface of each aluminum plate (6) and one surface of the foamed aluminum (2) obtained in the first step, placing the brazing filler metal in a muffle furnace, heating to melt the brazing filler metal (7), then respectively uniformly coating, cooling to room temperature along with the furnace, opening the furnace and taking out to finish brazing filler metal coating;
step four, compounding one surface of one aluminum plate coated with the brazing filler metal (7) with one surface of the foamed aluminum coated with the brazing filler metal (7), clamping the aluminum plate by using a graphite clamp, placing the aluminum plate in a muffle furnace, raising the temperature to 200-600 ℃ at a heating rate of 5-10 ℃/min, then preserving the heat for 1-10 min, adding a static magnetic field in the vertical direction, wherein the static magnetic field is generated by a superconducting magnet, a permanent magnet (3) is positioned above a coil (4), the coil (4) is positioned above a foamed aluminum composite structure formed by two aluminum plates, the magnetic induction intensity of the coil is 1-12T, alternating current with the frequency of 2-4 kHz is introduced into two ends of the aluminum plate (6), meanwhile, a certain pressure of 0.1-1 MPa is applied to the foamed aluminum plate composite structure, and the brazing filler metal (7) is fully wetted on the surfaces of the aluminum plate (6) and the foamed aluminum (2) under the combined action of the pressure, the;
and step five, overturning the welded foamed aluminum plate composite structure in the step four, then coating brazing filler metal (7) on the other surface of the foamed aluminum (2) by adopting the method in the step three, then performing the step four, compounding another aluminum plate (6) coated with the brazing filler metal on the other surface of the foamed aluminum (2), and finally completing welding to obtain the foamed aluminum sandwich plate.
2. The method for preparing the foamed aluminum sandwich plate by electromagnetic ultrasonic brazing as claimed in claim 1, wherein: in the first step, the surface is polished, cleaned and dried; firstly, polishing the surfaces of the foamed aluminum (2) and each aluminum plate (6) step by using water sand paper and metallographic sand paper in a sequence from coarse to fine to remove an oxidation film, cleaning for 10-30 min by using acetone, then putting the foamed aluminum (2) and each aluminum plate (6) into a sodium hydroxide aqueous solution, placing the sodium hydroxide aqueous solution into an ultrasonic cleaning machine, cleaning for 1-5 min, and then cleaning for 1-2 min by using a 30% nitric acid aqueous solution, wherein the mass-to-volume ratio of the sodium hydroxide aqueous solution is 30-50 g/L.
3. The method for preparing the foamed aluminum sandwich plate by electromagnetic ultrasonic brazing as claimed in claim 2, wherein: in the first step, the length of the foamed aluminum (2) and the length of the aluminum plate (6) are both 60-100 mm, and the width of the foamed aluminum is both 10-50 mm.
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