Recycled aluminum dross hollow sphere / aluminum matrix composite foam and method of making same

Abstract

The application provides a recycled aluminum ash hollow sphere / aluminum matrix composite foam material and a preparation method thereof, and belongs to the technical field of aluminum industrial solid waste resource recycling and metal material processing. The aluminum matrix is used instead of the resin matrix to prepare the composite foam material, and the aluminum ash is used as the hollow sphere raw material, so that the strength and specific energy absorption of the composite foam material can be significantly improved; after the metal aluminum is extracted, the hollow aluminum oxide particle content in the aluminum ash is relatively high, compared with the aluminum matrix, the hollow particle has a relatively low density, and after the aluminum ash hollow sphere is combined with the aluminum matrix, a light product can be manufactured; the obtained recycled aluminum ash hollow sphere / aluminum matrix composite foam material has the performance advantages of low density, high specific stiffness, high energy absorption capacity, excellent mechanical and acoustic damping performance and the like, and has a wide application prospect in the fields of aerospace, transportation, national defense and building.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of recycling of aluminum industry solid waste resources and metal material processing technology, and particularly relates to a recycled aluminum dross hollow sphere / aluminum-based composite foam material and a preparation method thereof. BACKGROUND

[0002] As a main by-product of aluminum industry, aluminum dross is produced in all processes of aluminum melting, and the aluminum content accounts for 1-12% of the total loss in the process of aluminum production. In the past, people discarded aluminum dross as waste slag, which not only caused waste of aluminum resources but also brought environmental problems. Therefore, seeking an economic and effective method to utilize and treat aluminum dross will not only improve the economic benefits of the aluminum industry, but also will have an important impact on the realization of economic and social sustainable development while realizing the effective recycling of resources.

[0003] Composite foam is a kind of material composed of hollow spheres filled in a resin matrix, and the ASTM standard limits composite foam to a polymer matrix. However, the composite foam with a polymer matrix has defects of low strength and low energy absorption capacity, which limits its application in the fields of aerospace, transportation, national defense and building, etc. SUMMARY

[0004] Therefore, the present application aims to provide a recycled aluminum dross hollow sphere / aluminum-based composite foam material and a preparation method thereof. The recycled aluminum dross hollow sphere / aluminum-based composite foam material prepared by the present application has good mechanical strength and high specific energy absorption.

[0005] In order to achieve the above-mentioned application purposes, the present application provides the following technical solutions:

[0006] The present application provides a preparation method of a recycled aluminum dross hollow sphere / aluminum-based composite foam material, which comprises the following steps:

[0007] The recycled aluminum dross particles, the high-temperature-resistant filter cotton and the aluminum alloy solid are sequentially placed in the mold from bottom to top, and the high-temperature-resistant filter cotton covers the aluminum dross particles;

[0008] The mold containing the aluminum dross particles, the high-temperature-resistant filter cotton and the aluminum alloy solid is heated to melt the aluminum alloy solid and obtain aluminum liquid on the surface of the high-temperature-resistant filter cotton;

[0009] Pressure is applied to the surface of the aluminum liquid to make the aluminum liquid penetrate through the high-temperature-resistant filter cotton and mix with the aluminum dross particles, and the recycled aluminum dross hollow sphere / aluminum-based composite foam material is obtained after cooling.

[0010] Preferably, the aluminum dross particles are small particles, medium particles or large particles.

[0011] The small particle has a particle size of 125-250 microns, the medium particle has a particle size of 250-425 microns, and the large particle has a particle size of 425-1000 microns.

[0012] Preferably, the aluminum ash particles are aluminum ash particles after heat hardening, and the heat hardening temperature is 400-450 DEG C.

[0013] Preferably, the aluminum ash particles comprise Al2O3, MgO, Fe2O3, SiO2, Al and impurities.

[0014] The total content of Al2O3, MgO, Fe2O3 and SiO2 is greater than or equal to 85% by mass content; the content of Al is less than or equal to 7%, and the content of impurities is less than or equal to 9%.

[0015] Preferably, the aluminum ash particles have a density of 1-1.5 g / cm3, a porosity of 15-40%, a Young's modulus of 45-115 GPa, and a hardness of 1.5-5 GPa. 2

[0016] Preferably, the volume ratio of the aluminum alloy solid to the aluminum ash particles is 0.5-1:1.

[0017] Preferably, the high-temperature-resistant filter cotton is kaolin cotton fiber.

[0018] Preferably, the temperature of the molten aluminum alloy solid is 700-715 DEG C; and the molten aluminum block is allowed to stand for 30-40 minutes.

[0019] The pressure applied has a magnitude of 6-12 MPa and a time of less than or equal to 30 seconds.

[0020] Preferably, the aluminum liquid permeates the mixture of high-temperature-resistant filter cotton and aluminum ash particles, and the obtained mixture is further subjected to T6 heat treatment.

[0021] The present application provides a recycled aluminum ash hollow sphere / aluminum-based composite foam material prepared by the above preparation method, comprising aluminum ash particles and aluminum alloy filled in the gaps of the aluminum ash particles.

[0022] ​The application provides a preparation method of recycled aluminum ash hollow sphere / aluminum matrix composite foam material, and comprises the following steps: placing recycled aluminum ash particles, high-temperature-resistant filter cotton and aluminum alloy solids in a mold from bottom to top in sequence, wherein the high-temperature-resistant filter cotton covers the aluminum ash particles; heating the mold containing the aluminum ash particles, the high-temperature-resistant filter cotton and the aluminum alloy solids, melting the aluminum alloy solids, and obtaining aluminum liquid on the surface of the high-temperature-resistant filter cotton; and applying pressure on the surface of the aluminum liquid, so that the aluminum liquid penetrates through the high-temperature-resistant filter cotton and mixes with the aluminum ash particles, and the recycled aluminum ash hollow sphere / aluminum matrix composite foam material is obtained after cooling.

[0023] Meanwhile, the application uses the aluminum ash hollow sphere obtained by recycling and treating the solid waste of the aluminum industry as the reinforcing body to replace the hollow sphere in the conventional metal matrix composite foam material, thereby reducing the processing cost of the metal matrix composite foam material, realizing high-value utilization of the solid waste of the aluminum industry, and reducing the adverse effects of the solid waste of the aluminum industry on the ecological environment while realizing effective recycling of resources.

[0024] The application uses the melt infiltration technology to prepare the recycled aluminum ash hollow sphere / aluminum matrix composite foam material, which can avoid the phenomenon that the low-density particles float to the top of the melt in the traditional stirring and casting process, and the external pressure applied in the infiltration process can increase the wettability of the melt and the aluminum ash particles, promote uniform mixing of the aluminum melt and the aluminum ash particles, and further ensure uniform deformation of the material.

[0025] Further, the aluminum ash particles used in the application are small particles (125-250 mu m), medium particles (250-425 mu m) or large particles (425-1000 mu m), the same specification of the aluminum ash hollow sphere makes the pore distribution in the composite foam material uniform, which is beneficial to overcome the problem of non-uniform deformation of the material, the adjustability of the size and quantity of the aluminum ash particles ensures the controllability of the structure and performance of the composite foam, and by designing the corresponding pore size, porosity and different pore structures, the recycled aluminum ash hollow sphere / aluminum matrix composite foam material can be applied in different fields. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 A preparation flow chart of recycled aluminum ash hollow sphere / aluminum matrix composite foam material. DETAILED DESCRIPTION

[0027] The application provides a preparation method of recycled aluminum ash hollow sphere / aluminum matrix composite foam material, which comprises the following steps:

[0028] The recycled aluminum ash particles, the high-temperature-resistant filter cotton and the aluminum alloy solid are sequentially placed in the mold from bottom to top, and the high-temperature-resistant filter cotton covers the aluminum ash particles.

[0029] The mold containing the aluminum ash particles, the high-temperature-resistant filter cotton and the aluminum alloy solid is heated to melt the aluminum alloy solid, and the aluminum liquid is obtained on the surface of the high-temperature-resistant filter cotton.

[0030] Pressure is applied to the surface of the aluminum liquid to make the aluminum liquid penetrate through the high-temperature-resistant filter cotton and mix with the aluminum ash particles, and the recycled aluminum ash hollow sphere / aluminum matrix composite foam material is obtained after cooling.

[0031] In the application, the recycled aluminum ash particles, the high-temperature-resistant filter cotton and the aluminum alloy solid are sequentially placed in the mold from bottom to top, and the high-temperature-resistant filter cotton covers the aluminum ash particles.

[0032] In the application, the aluminum ash particles are preferably small particles, medium particles or large particles; in the application, the particle size of the small particles is preferably 125-250 μm, and more preferably 150-200 μm; the particle size of the medium particles is preferably 250-425 μm, and more preferably 300-400 μm; the particle size of the large particles is preferably 425-1000 μm, and more preferably 600-800 μm. The aluminum ash particles used in the application are small particles (125-250 μm), medium particles (250-425 μm) or large particles (425-1000 μm), the same specification of aluminum ash hollow sphere makes the pore distribution in the composite foam material uniform, which is beneficial to overcome the problem of non-uniform deformation of the material; the adjustability of the specification size and quantity of the aluminum ash particles ensures the controllability of the composite foam structure and performance, and through the design of the corresponding pore size, porosity and different pore structures, the recycled aluminum ash hollow sphere / aluminum matrix composite foam material can be applied in different fields.

[0033] In the application, the aluminum ash particles are preferably heated and hardened aluminum ash particles, the heating and hardening temperature is preferably 400-450 ℃, and more preferably 420-440 ℃, and the heating and hardening is preferably carried out in an air atmosphere. In the application, the aluminum ash particles are cooled immediately after being heated to the heating and hardening temperature; the cooling mode is preferably natural cooling in air. In the application, the purpose of the heating and hardening is to improve the hardness of the aluminum ash particles.

[0034] In the present application, the components of the aluminum dross particles preferably include Al2O3, MgO, Fe2O3, SiO2, Al and impurities, the impurities are preferably one or more of CaO, CaF2 and Na3AlF6; the total content of Al2O3, MgO, Fe2O3 and SiO2 is preferably ≥ 85%, more preferably 85-90% by mass percentage; the content of Al is preferably ≤ 7%, more preferably 4-6%; the content of the impurities is preferably ≤ 9%, more preferably 6-8%.

[0035] In the present application, the density of the aluminum dross particles is preferably 1-1.5 g / cm 2 , more preferably 1.2-1.4 g / cm 2 ; the porosity is preferably 15-40%, more preferably 25-30%; the Young's modulus is preferably 45-115 GPa, more preferably 60-100 GPa; the hardness is preferably 1.5-5 GPa, more preferably 2-4 GPa.

[0036] In the present application, the volume ratio of the aluminum alloy solid to the aluminum dross particles is preferably ≥ 0.5. In the present application, the aluminum alloy is preferably a 6xxx series aluminum alloy, particularly preferably 6082, 6061 or 6063 aluminum alloy; the chemical composition of the 6082 aluminum alloy is preferably Al-(0.7-1.3)Si-(0.6-1.2)Mg-(0.4-1.0)Mn-(<0.5)Fe-(<0.25)Cr-(<0.2)Zn-(<0.1)Cu-(<0.1)Ti (wt.%). In the present application, the 6082 aluminum alloy has a high Si content, good fluidity and a relatively high Mg content, which increases the strength of the alloy.

[0037] As a specific embodiment of the present application, the shape of the aluminum alloy solid is preferably cylindrical, and the diameter of the cylindrical aluminum alloy solid is preferably 50-70 mm, more preferably 55-65 mm.

[0038] In the present application, the high-temperature-resistant filter cotton is preferably kaolin cotton fiber. In the present application, the thickness of the high-temperature-resistant filter cotton is preferably 0.5-1 mm. In the present application, the high-temperature-resistant filter cotton can prevent the aluminum dross particles from directly contacting the aluminum melt before infiltration and filter part of the aluminum oxide layer during infiltration.

[0039] In the present application, the mold is preferably a steel mold; in the present application, the height of the mold is preferably 55-75 mm, more preferably 60-70 mm; the diameter is preferably 50-70 mm, more preferably 55-65 mm. In the present application, the bottom of the mold is preferably closed with a steel disc, and there are fine notches on the edge to allow air to escape during the infiltration process.

[0040] In the present application, a steel disc is preferably placed on the top of the aluminum alloy solid, which functions to facilitate the application of pressure on the surface of the aluminum liquid.

[0041] In the present application, the mold containing the aluminum dross particles, the high-temperature-resistant filter cotton and the aluminum alloy solid is heated to melt the aluminum alloy solid and obtain the aluminum liquid on the surface of the high-temperature-resistant filter cotton. In the present application, the heating temperature is preferably 700-715℃, more preferably 705-710℃, and the holding time is preferably 30 min. In the present application, the heating rate to the heating temperature is preferably 5℃ / min. In the present application, the heating is preferably performed in an air atmosphere. The entire mold is preferably heated in a resistance furnace to ensure complete melting of the aluminum alloy solid.

[0042] In the present application, after the aluminum block is melted, the present application preferably stands for 30-40 min to ensure uniformity of the aluminum melt composition.

[0043] In the present application, pressure is applied on the surface of the aluminum liquid to make the aluminum liquid infiltrate the high-temperature-resistant filter cotton and mix with the aluminum dross particles, and the recycled aluminum dross hollow sphere / aluminum matrix composite foam material is obtained after cooling. The present application preferably uses a hydraulic machine to apply pressure. In the present application, the applied pressure is preferably 6-12 MPa, more preferably 8-10 MPa. In the present application, the mold is transferred to the hydraulic machine quickly and is ensured not to be tilted. By applying a downward pressure of 6-12 MPa, the present application can avoid crushing of the aluminum dross particles during the infiltration process.

[0044] In the present application, after the aluminum liquid infiltrates the high-temperature-resistant filter cotton and mixes with the aluminum dross particles, the obtained recycled aluminum dross hollow sphere / aluminum matrix composite foam material is further subjected to T6 heat treatment. In the present application, the T6 heat treatment preferably comprises heating the obtained recycled aluminum dross hollow sphere / aluminum matrix composite foam material to 540℃, holding for 100 min, then quenching in water, and finally aging at 180℃ for 10 h. Through the T6 heat treatment, the present application can improve the mechanical properties of the composite foam material.

[0045] In the present application, the flow chart of the preparation of the recycled aluminum dross hollow sphere / aluminum matrix composite foam material is shown in Figure 1 .

[0046] The present application provides the recycled aluminum dross hollow sphere / aluminum matrix composite foam material prepared by the above preparation method, which comprises aluminum dross particles and aluminum alloy filled in the gaps between the aluminum dross particles. In the present application, the density of the recycled aluminum dross hollow sphere / aluminum matrix composite foam material is preferably 1-1.5 g / cm 3 , and the porosity is preferably 10-80%, more preferably 20-60%.

[0047] The following detailed description, in conjunction with embodiments, illustrates the recycled aluminum ash hollow sphere / aluminum-based composite foam material and its preparation method provided by the present invention. However, these descriptions should not be construed as limiting the scope of protection of the present invention.

[0048] Example 1

[0049] The preparation method of recycled aluminum ash hollow spheres / aluminum-based composite foam material includes the following steps:

[0050] The raw material is aluminum ash from an electrolytic aluminum plant in Henan Province, my country. It contains 85.8% alumina, 6.2% metallic aluminum, and 8.0% impurities (including CaO, CaF2, and Na3AlF6). The average particle size is 207 μm, and the density is 1.4 g / cm³. 3 The material has a porosity of 15%, an elastic modulus of 48.1 GPa, and a hardness of 1.9 GPa. Weighed aluminum ash granules are loaded into a steel mold with an inner diameter of 50 mm and a height of 55 mm. The mold is vibrated appropriately to disperse the granules evenly. A 1 mm thick layer of kaolin fiber filter cotton is placed on top of the aluminum ash to prevent direct contact between the aluminum ash powder and the molten aluminum before infiltration, and to filter out some of the alumina layer during infiltration. A pre-weighed 6082 aluminum alloy cylindrical block is placed on the kaolin fiber filter cotton, and a 49 mm diameter steel disc is placed on top of the aluminum block. The volume ratio of the solid aluminum alloy to the aluminum ash granules is 1:1. The mold containing the raw materials is then placed in an electric resistance furnace and heated until the aluminum block melts. The mold is maintained at 710°C for 30 minutes. Finally, the mold is carefully moved onto the hydraulic press and pressure of 8MPa is applied to quickly press the molten aluminum alloy into the aluminum ash powder and fill the gaps between the aluminum ash particles. Then the entire mold is placed in the air to cool until it is completely solidified, resulting in recycled aluminum ash hollow spheres / aluminum-based composite foam material.

[0051] The density of the recycled aluminum ash hollow spheres / aluminum-based composite foam material was tested to be 1.9 g / cm³. 3 The percentage of cavitation defects in all tested samples was less than 1%; under quasi-static loading, the yield strength was 388.5 MPa, and the specific energy absorption was 44.3 MJ / m. 3 The compressive modulus is 6.9 GPa. The above performance testing standards refer to ISO 13314.

[0052] Example 2

[0053] The preparation method of recycled aluminum ash hollow spheres / aluminum-based composite foam material includes the following steps:

[0054] The raw material is aluminum ash from an aluminum processing plant in Henan Province, my country. It contains 88.6% alumina, 5.1% metallic aluminum, and 6.3% impurities (including CaO, CaF2, and Na3AlF6). The average particle size is 358 μm, and the density is 1.2 g / cm³.3 , porosity 21%, elastic modulus 60.5 GPa, hardness 2.6 GPa. The weighed aluminum dross particles were loaded into a steel mold with an inner diameter of 50 mm and a height of 55 mm, and the mold was appropriately vibrated to uniformly disperse the aluminum dross particles. A 1 mm thick kaolin fiber filter cotton was placed on the top layer of the aluminum dross to prevent the aluminum dross powder from directly contacting the aluminum melt before infiltration and to be able to filter part of the aluminum oxide layer during infiltration. A 6082 aluminum alloy cylindrical block that had been weighed in advance was placed on the kaolin fiber filter cotton, and a steel disc with a diameter of 49 mm was placed on top of the aluminum block. The volume ratio of the aluminum alloy solid to the aluminum dross particles was 1:1. The mold loaded with raw materials was placed in a resistance furnace for heating until the aluminum block melted, and the mold was kept at 710°C for 30 minutes. Finally, the mold was carefully moved to a hydraulic press, and a pressure of 8 MPa was applied to rapidly press the molten Al liquid into the aluminum dross powder and fill the gaps between the aluminum dross particles. Subsequently, the entire mold was placed in air to cool until complete solidification, obtaining a recycled aluminum dross hollow sphere / aluminum matrix composite foam material.

[0055] The density of the obtained recycled aluminum dross hollow sphere / aluminum matrix composite foam material was 1.8 g / cm 3 , and the number of air pocket defects in all tested samples was less than 1%. Under quasi-static loading, the yield strength was 259.3 MPa, the specific energy absorption was 34.3 MJ / m 3 , and the compressive modulus was 5.6 GPa.

[0056] Example 3

[0057] The preparation method of the recycled aluminum dross hollow sphere / aluminum matrix composite foam material is as follows:

[0058] The raw material was aluminum dross from a certain aluminum processing plant in Guangdong, China, with an alumina content of 90.2%, a metallic aluminum content of 7.5%, an impurity (including CaO, CaF2, and Na3AlF6) content of 2.3%, an average particle size of 805 μm, and a density of 1.1 g / cm 3, porosity 30%, elastic modulus 114.0 GPa, hardness 9.3 GPa. The weighed aluminum ash particles were loaded into a steel mold with an inner diameter of 70 mm and a height of 65 mm, and the mold was appropriately vibrated to uniformly disperse the aluminum ash particles. A kaolin fiber filter cotton with a thickness of 0.5-1 mm was placed on the top layer of the aluminum ash to prevent the aluminum ash powder from directly contacting the aluminum melt before infiltration and to filter part of the aluminum oxide layer during infiltration. A previously weighed 6082 aluminum alloy cylindrical block was placed on the kaolin fiber filter cotton, and a steel disc with a diameter of 69 mm was placed on the top of the aluminum block. The volume ratio of the aluminum alloy solid to the aluminum ash particles was 1:1. The mold loaded with raw materials was placed in a resistance furnace for heating until the aluminum block was melted, and the mold was kept at 715°C for 30 minutes. Finally, the mold was carefully moved to a hydraulic press, and a pressure of 8 MPa was applied to rapidly press the molten Al liquid into the aluminum ash powder and fill the gaps between the aluminum ash particles. Subsequently, the entire mold was placed in air to cool until complete solidification, obtaining a recycled aluminum ash hollow sphere / aluminum matrix composite foam material.

[0059] The density of the obtained recycled aluminum ash hollow sphere / aluminum matrix composite foam material was 1.6 g / cm 3 , the percentage of air pocket defects in all tested samples was less than 1%, the yield strength under quasi-static loading was 111.1 MPa, the specific energy absorption was 53.5 MJ / m 3 , and the compression modulus was 4.7 GPa.

[0060] Comparative Example 1

[0061] The other conditions were the same as in Example 1, except that the aluminum ash raw material was preheated to 430°C and cooled in air. The density of the aluminum ash was 1.4 g / cm 3 , the porosity was 16%, the elastic modulus was 77.0 GPa, and the hardness was 4.7 GPa.

[0062] The density of the obtained recycled aluminum ash hollow sphere / aluminum matrix composite foam material was 1.9 g / cm 3 , the percentage of air pocket defects in all tested samples was less than 1%, the yield strength under quasi-static loading was 395.5 MPa, the specific energy absorption was 45.7 MJ / m 3 , and the compression modulus was 6.9 GPa.

[0063] Comparative Example 2

[0064] The other conditions were the same as in Example 2, except that the aluminum ash raw material was preheated to 430°C and cooled in air. The density of the aluminum ash was 1.2 g / cm 3 , the porosity was 20%, the elastic modulus was 61.6 GPa, and the hardness was 4.9 GPa.

[0065] The density of the obtained recycled aluminum ash hollow sphere / aluminum-based composite foam material is 1.7 g / cm 3 The percentage of air pocket defects in all tested samples is less than 1%, the yield strength under quasi-static loading is 275.8 MPa, and the specific energy absorption is 33.8 MJ / m 3 The compressive modulus is 5.7 GPa.

[0066] Comparative Example 3

[0067] The other conditions are the same as in Example 3, except that the aluminum ash raw material is preheated to 430°C and cooled in air, and the aluminum ash has a density of 1.2 g / cm 3 , a porosity of 20%, an elastic modulus of 61.6 GPa, and a hardness of 4.9 GPa.

[0068] The density of the obtained recycled aluminum ash hollow sphere / aluminum-based composite foam material is 1.7 g / cm 3 The percentage of air pocket defects in all tested samples is less than 1%, the yield strength under quasi-static loading is 275.8 MPa, and the specific energy absorption is 33.8 MJ / m 3 The compressive modulus is 5.7 GPa.

[0069] Comparative Example 4

[0070] The other conditions are the same as in Example 3, except that the obtained aluminum-based composite foam material is subjected to T6 heat treatment, and the yield strength of the composite foam material under quasi-static loading is 171.98 MPa, the specific energy absorption is 70.9 MJ / m 3 The compressive modulus is 5.9 GPa.

[0071] Comparative Example 5

[0072] The other conditions are the same as in Example 2, except that the raw material is a commercially available ceramic powder, which contains 36% of alumina, 62% of silica, 1% of iron oxide, and 1% of TiO2, has an average particle size of 326 μm, and a density of 0.7 g / cm 3 , a porosity of 78%, an elastic modulus of 37.2 GPa, and a hardness of 7.0 GPa.

[0073] The density of the obtained recycled aluminum ash hollow sphere / aluminum-based composite foam material is 1.7 g / cm 3 The percentage of air pocket defects in all tested samples is less than 1%, the yield strength under quasi-static loading is 275.8 MPa, and the specific energy absorption is 33.8 MJ / m 3 The compressive modulus is 5.7 GPa.

[0074] The above merely describes the preferred embodiments of the present application, and it should be pointed out that, for those skilled in the art, several improvements and refinements can be made without departing from the principles of the present application, and these improvements and refinements should also be considered as falling within the protection scope of the present application.

Claims

1. A method for preparing recycled aluminum ash hollow spheres / aluminum-based composite foam material, comprising the following steps: The raw aluminum ash has an alumina content of 85.8%, a metallic aluminum content of 6.2%, and impurities including CaO, CaF2, and Na3AlF6, with an impurity content of 8.0%. The average particle size is 207 μm, and the density is 1.4 g / cm³. 3 It has a porosity of 15%, an elastic modulus of 48.1 GPa, and a hardness of 1.9 GPa. The weighed aluminum ash particles are loaded into a steel mold with an inner diameter of 50 mm and a height of 55 mm. The mold is vibrated appropriately to disperse the aluminum ash particles evenly. A 1 mm thick kaolin fiber filter cotton is placed on top of the aluminum ash to prevent the aluminum ash powder from directly contacting the aluminum melt before penetration and to filter out part of the alumina layer during penetration. Place the pre-weighed 6082 aluminum alloy cylindrical block on the kaolin fiber filter cotton, and place a steel plate with a diameter of 49mm on top of the aluminum block. The volume ratio of the aluminum alloy solid to the aluminum ash particles is 1:

1. The mold containing the raw materials is placed in an electric resistance furnace and heated until the aluminum block melts. The mold is then kept at 710°C for 30 minutes. Finally, the mold is carefully moved to a hydraulic press and a pressure of 8MPa is applied to quickly press the molten aluminum alloy into the aluminum ash powder and fill the gaps between the aluminum ash particles. The entire mold is then placed in the air to cool until it is completely solidified, resulting in recycled aluminum ash hollow spheres / aluminum-based composite foam material.

2. The recycled aluminum ash hollow sphere / aluminum-based composite foam material prepared by the preparation method of claim 1 comprises aluminum ash particles and aluminum alloy filling the gaps between the aluminum ash particles.

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