High-thermal-conductivity and high-strength aluminum alloy material and preparation method thereof

Abstract

The invention relates to the technical field of preparation of high-thermal-conductivity and high-strength aluminum alloy materials, in particular to a high-thermal-conductivity and high-strength aluminum alloy material and a preparation method thereof. The invention discloses a high-thermal-conductivity and high-strength aluminum alloy material which is composed of the following elements in percentage: 6%-15% of Si, 0.5%-1.0% of Fe, 0.3%-0.5% of Mg, 0.2%-0.5% of Mn and 0.2%-1.8% of Ni. And the balance of Al. The composition proportion of the high-heat-conductivity and high-strength aluminum alloy material is optimized, the hardness and strength of the alloy are remarkably improved by adjusting the adding proportion of Si, and on the basis, the Ni element is further selected to inhibit formation of a needle phase in the aluminum-silicon alloy, so that the strength of the aluminum alloy material is improved, meanwhile, the defect that the heat-conducting property of the aluminum alloy material is degraded is overcome, and the service life of the aluminum alloy material is prolonged. Therefore, the aluminum alloy material meets the requirements of good heat-conducting property and strength property.

Description

Technical Field

[0001] The present invention relates to the technical field of preparation of high thermal conductivity and high strength aluminum alloy materials, and in particular to a high thermal conductivity and high strength aluminum alloy material and a preparation method thereof. Background Art

[0002] Aluminum alloys are widely used in mechanical equipment, electronic appliances, transportation and other fields due to their abundant resources, light weight and easy recycling. In the field of electronic communications, various electronic components are highly integrated. As the operating frequency increases and the power is greatly increased, the heat generated also increases significantly, thus affecting the stability of electronic equipment.

[0003] The thermal conductivity of common cast aluminum alloys is generally lower than 150W / (m·k), such as ADC12, A356, A380, etc., which is difficult to meet the requirements of heat dissipation capacity of components. With the advent of the 5G communication era, the miniaturization, lightweight and integration of electronic products and communication equipment have increased, and the phenomenon that the heat dissipation of equipment exceeds the natural cooling and heat dissipation capacity of current aluminum alloy materials has become more and more obvious, which has limited the further development and application of aluminum alloy materials.

[0004] In view of the above-mentioned related technologies, the inventors found that aluminum alloys are generally strengthened by introducing solid solution atoms, precipitating strengthening phases or generating intermediate phases in the Al matrix. According to the microscopic mechanism analysis of metal thermal conductivity, defects in the crystal lattice, solid solution atoms or precipitated phases in aluminum alloys will cause changes in the electric field period, thereby increasing the probability of free electrons participating in heat transfer being scattered, reducing the mean free path of electrons, and causing the alloy's thermal conductivity to decrease. Therefore, it is generally believed that the strengthening of aluminum alloys is in conflict with the improvement of the thermal conductivity of the material, so it is necessary to further optimize its mechanical properties while effectively improving the thermal conductivity of aluminum alloy materials, so that it has excellent strength and good thermal conductivity. Summary of the invention

[0005] In order to improve the defect that the existing aluminum alloy materials cannot have both high thermal conductivity and high strength, the present application provides a high thermal conductivity and high strength aluminum alloy material and a preparation method thereof.

[0006] In a first aspect, the present application provides a high thermal conductivity and high strength aluminum alloy material, which adopts the following technical solution:

[0007] A high thermal conductivity and high strength aluminum alloy material is composed of the following percentage elements: 6%-15% Si, 0.5%-1.0% Fe, 0.3%-0.5% Mg, 0.2%-0.5% Mn and 0.2%-1.8% Ni; the balance is Al.

[0008] Through the above technical scheme, the present application optimizes the composition ratio of high thermal conductivity and high strength aluminum alloy materials, and adjusts the addition ratio of Si by optimizing the content of each element. The increase in Si content can improve the fluidity of the aluminum alloy, fill the shrinkage seams of the casting during casting, and can significantly improve the hardness and strength of the alloy. On this basis, the present application further selects the Ni element to transform the brittle flaky β-Al5FeSi intermetallic compound into an elongated Al9FeNi phase through a peritectic reaction, thereby inhibiting the formation of needle-like phases in the aluminum-silicon alloy, thereby improving the strength of the aluminum alloy material while improving the defect of its degraded thermal conductivity, thereby achieving the requirements of the aluminum alloy material for both good thermal conductivity and strength performance.

[0009] Furthermore, the high thermal conductivity and high strength aluminum alloy material is further added with a high thermal conductivity modifier, and the high thermal conductivity modifier includes at least one of graphene, carbon nanotubes or graphite particles.

[0010] Through the above technical scheme, the present application adds carbon material as a high thermal conductivity modifier to the high thermal conductivity and high strength aluminum alloy material. Since the carbon material has good thermal conductivity, it is filled into the interior of the aluminum alloy material to form a good thermal conduction path, which significantly reduces thermal resistance, improves thermal conductivity, and greatly improves heat dissipation performance. At the same time, the addition of high thermal conductivity modifiers mainly composed of carbon materials can also effectively refine the alloy grains, thereby effectively enhancing the strength and rigidity of the material, so that the alloy can still maintain excellent mechanical properties under high temperature environment.

[0011] Furthermore, the surface of the high thermal conductivity modifier is coated with an interface modification layer, and the interface modification layer includes a metal deposition layer.

[0012] Furthermore, the metal element in the metal deposition layer includes at least one of La, Sr, Ce or Er.

[0013] Through the above technical solution, the present application optimizes the structure of the high thermal conductivity modifier. By setting a metal deposition layer on the surface of the high thermal conductivity modifier, the interfacial bonding force between the modifier and the aluminum matrix can be improved, and the overall performance of the material can be enhanced. This interface modification can not only improve thermal conductivity, but also improve wear resistance and corrosion resistance, and extend the service life of the alloy material. At the same time, the presence of the metal deposition layer can effectively suppress the interfacial thermal resistance during heat conduction and improve thermal conductivity.

[0014] On this basis, the present application further optimizes the types of elements in the metal deposition layer, and significantly improves the strength, corrosion resistance and high-temperature stability of the alloy material through elements such as La, Sr, Ce or Er. At the same time, the above-mentioned rare earth elements have excellent alloying effects. They can improve the microstructure of the material, improve grain refinement and uniformity of phase distribution, and thus enhance the mechanical properties and thermal stability of the alloy.

[0015] Furthermore, the surface of the high thermal conductivity modifier is coated with a lanthanum-cerium coating layer, and the high thermal conductivity modifier is made by the following technical solution:

[0016] Place lanthanum cerium carbonate in deionized water, add nitric acid to adjust the pH, stir and mix, add urea and hexadecyltrimethylammonium bromide, collect the mixed solution, place the graphene solution in the mixed solution, ultrasonically disperse and collect the dispersed slurry, filter and collect the filter cake;

[0017] The filter cake is placed in a vacuum furnace, and after passing protective gas, heat-treated in a high temperature environment for 1-2 hours, and then allowed to stand and cool to room temperature, so as to prepare the high thermal conductivity modifier.

[0018] Through the above technical solution, the present application optimizes the technical solution of coating the surface of the high thermal conductivity modifier with a lanthanum-cerium coating layer. Since lanthanum-cerium carbonate decomposes to form oxides under high temperature environment, and then is reduced under carbon material and high temperature environment and effectively deposited on the surface of the high thermal conductivity modifier, a high thermal conductivity modifier material with a lanthanum-cerium coating layer on the surface is prepared simply and quickly.

[0019] Furthermore, the heat treatment temperature is 1000-1100°C.

[0020] In a second aspect, the present application provides a method for preparing a high thermal conductivity and high strength aluminum alloy material, using the following technical solution:

[0021] A method for preparing a high thermal conductivity and high strength aluminum alloy material, comprising the following preparation steps:

[0022] The raw materials of aluminum, iron and nickel alloy are placed in a heating furnace according to the formula, and heated and melted;

[0023] After heating and melting, the single crystal silicon is added to the heating furnace, kept warm and cooled;

[0024] Pure magnesium is added to the heating furnace after the temperature is reduced, and the mixture is stirred and mixed, and a refining agent and a high thermal conductivity modifier are added. The mixture is refined and slag is removed, and the molten liquid is collected and poured into a mold, and the high thermal conductivity and high strength aluminum alloy material is prepared by standing and cooling.

[0025] Through the above technical scheme, the present application optimizes the preparation method of high thermal conductivity and high strength aluminum alloy materials. According to the properties of different raw materials, the order of adding raw materials is adjusted to improve the mixing uniformity of the raw material components, thereby further improving the mechanical properties and thermal conductivity of the aluminum alloy materials. At the same time, the introduction of the present application in the refining stage ensures the removal of impurities in the aluminum alloy, further improving the purity and performance of the material.

[0026] Furthermore, the refining process also includes an ultrasonic-assisted modification process, wherein the power of the ultrasonic-assisted modification process is 900-1200 W and the processing time is 80-100 S.

[0027] Through the above technical scheme, the present application applies the scheme of ultrasonic assisted modification technology in the refining process. Firstly, since the melt formed by the melting of raw materials always contains impurity particles such as oxides, carbides, nitrides and borides, their surfaces often have micron-level cracks and fissures. Due to the presence of gas phase on their surface, they cannot be wetted by the melt. Ultrasonic assisted treatment can effectively improve the wetting of the melt to the impurity particles, thereby activating them to become effective nucleation sites.

[0028] Secondly, the present application uses an ultrasonic-assisted technical solution to significantly improve the fluidity and uniformity of the alloy melt, promote the uniform distribution of alloy elements, and enhance the rate of physical and chemical reactions. This treatment method can effectively reduce the number of bubbles in the melt and increase the density of the aluminum alloy, thereby improving its mechanical properties and thermal conductivity.

[0029] Finally, this application optimizes the ultrasonic power and processing time, which can achieve fine control of the properties of the alloy material, ensuring that the final product has excellent thermal conductivity and strength, making it more suitable for high-end manufacturing and application fields.

[0030] Furthermore, a method for preparing a high thermal conductivity and high strength aluminum alloy material further includes solid solution and aging treatment, wherein the solid solution and aging treatment comprises the following steps:

[0031] Solution treatment is carried out at 500-550℃ for 5-7h, water quenching is carried out at room temperature, and then aging treatment is carried out at 160-180℃ for 10-18h.

[0032] In summary, this application has the following beneficial effects:

[0033] First, the present application optimizes the composition ratio of high thermal conductivity and high strength aluminum alloy materials. By optimizing the content of each element, the addition ratio of Si is adjusted. The increase in Si content can improve the fluidity of the aluminum alloy, fill the shrinkage seams of the casting during casting, and significantly improve the hardness and strength of the alloy. On this basis, the present application further selects the Ni element to transform the brittle flaky β-Al5FeSi intermetallic compound into an elongated Al9FeNi phase through a peritectic reaction, thereby inhibiting the formation of needle-like phases in the aluminum-silicon alloy, thereby improving the strength of the aluminum alloy material while improving its defect of degraded thermal conductivity, thereby achieving the requirements of the aluminum alloy material for both good thermal conductivity and strength performance.

[0034] Second, the present application adds carbon material as a high thermal conductivity modifier to the high thermal conductivity and high strength aluminum alloy material. Since the carbon material has good thermal conductivity, it is filled into the interior of the aluminum alloy material to form a good thermal conduction path, which significantly reduces thermal resistance, improves thermal conductivity, and greatly improves heat dissipation performance. At the same time, the addition of a high thermal conductivity modifier mainly composed of carbon material can also effectively refine the alloy grains, thereby effectively enhancing the strength and rigidity of the material, so that the alloy can still maintain excellent mechanical properties under high temperature environment.

[0035] Third, the present application optimizes the structure of the high thermal conductivity modifier. By setting a metal deposition layer on the surface of the high thermal conductivity modifier, the interfacial bonding force between the modifier and the aluminum matrix can be improved, and the overall performance of the material can be enhanced. This interface modification can not only improve thermal conductivity, but also improve wear resistance and corrosion resistance, and extend the service life of the alloy material. At the same time, the presence of the metal deposition layer can effectively suppress the interfacial thermal resistance during heat conduction and improve thermal conductivity.

[0036] On this basis, the present application further optimizes the types of elements in the metal deposition layer, and significantly improves the strength, corrosion resistance and high-temperature stability of the alloy material through elements such as La, Sr, Ce or Er. At the same time, the above-mentioned rare earth elements have excellent alloying effects. They can improve the microstructure of the material, improve grain refinement and uniformity of phase distribution, and thus enhance the mechanical properties and thermal stability of the alloy.

[0037] Fourth, the present application applies the solution of ultrasonic-assisted modification technology in the refining process. First, since the melt formed by the melting of raw materials always contains impurity particles such as oxides, carbides, nitrides and borides, their surfaces often have micron-level cracks and fissures. Due to the presence of gas phase on their surface, they cannot be wetted by the melt. Ultrasonic-assisted treatment can effectively improve the wetting of the melt to the impurity particles, thereby activating them to become effective nucleation sites.

[0038] Secondly, the present application uses an ultrasonic-assisted technical solution to significantly improve the fluidity and uniformity of the alloy melt, promote the uniform distribution of alloy elements, and enhance the rate of physical and chemical reactions. This treatment method can effectively reduce the number of bubbles in the melt and increase the density of the aluminum alloy, thereby improving its mechanical properties and thermal conductivity. DETAILED DESCRIPTION

[0039] The present application is further described in detail below with reference to the embodiments.

[0040] In the examples of the present application, the raw materials and instruments used are as follows, but not limited thereto. Raw materials not otherwise described are of analytical grade:

[0041] Preparation Example 1

[0042] Graphene particles coated with lanthanum-cerium coating

[0043] 89 g of lanthanum cerium carbonate was placed in 500 mL of deionized water, 5% nitric acid was added to a pH of 6.5, 120 g of urea and 8 g of hexadecyltrimethylammonium bromide were added after stirring, and a mixed solution was collected. 500 g of a 50 mg / mL graphene solution was placed in the mixed solution, and the dispersed slurry was collected by ultrasonic dispersion, and the filter cake was collected after filtering;

[0044] The filter cake is placed in a vacuum furnace, and after passing protective gas, heat-treated in a high temperature environment for 1 hour, and then allowed to stand and cool to room temperature, thereby preparing the high thermal conductivity modifier 1.

[0045] Preparation Example 2

[0046] Graphene particles coated with lanthanum-cerium coating

[0047] 90 g of lanthanum cerium carbonate was placed in 550 mL of deionized water, 5% nitric acid was added to a pH of 6.8, 135 g of urea and 1 g of hexadecyltrimethylammonium bromide were added after stirring, and a mixed solution was collected. 650 g of a 50 mg / mL graphene solution was placed in the mixed solution, and the dispersed slurry was collected by ultrasonic dispersion, and the filter cake was filtered and collected.

[0048] The filter cake is placed in a vacuum furnace, and after passing protective gas, heat-treated in a high temperature environment for 1-2 hours, and then allowed to stand and cool to room temperature, the high thermal conductivity modifier 2 can be prepared.

[0049] Preparation Example 3

[0050] Graphene particles coated with lanthanum-cerium coating

[0051] 95 g of lanthanum cerium carbonate was placed in 600 mL of deionized water, 5% nitric acid was added to pH 7.0, 150 g of urea and 12 g of hexadecyltrimethylammonium bromide were added after stirring, and a mixed solution was collected. 800 g of a 50 mg / mL graphene solution was placed in the mixed solution, and the dispersed slurry was collected by ultrasonic dispersion, and the filter cake was collected after filtering;

[0052] The filter cake is placed in a vacuum furnace, and after passing protective gas, heat-treated in a high temperature environment for 1-2 hours, and then allowed to stand and cool to room temperature, the high thermal conductivity modifier 3 can be prepared.

[0053] Embodiment 1-6 The following is described by taking Embodiment 1-3 as an example:

[0054] Example 1

[0055] A high thermal conductivity and high strength aluminum alloy material, comprising the following preparation steps:

[0056] According to the formula in Table 1, the raw materials of aluminum, iron and nickel alloy are placed in a heating furnace and heated to melt;

[0057] After heating and melting, the temperature is raised to 800°C and the single crystal silicon is added to the heating furnace. After the temperature is kept at this temperature for 30 minutes, the temperature is lowered to 750°C.

[0058] Pure magnesium is added to the heating furnace after the temperature is lowered, the mixture is stirred and a refining agent is added, and the refining treatment and slag removal are carried out under ultrasonic-assisted modification treatment. The ultrasonic-assisted modification treatment power is controlled to be 900 W, and the treatment time is 80 s. After the slag removal is completed, the molten liquid is collected and poured into a mold, and solid solution is carried out at 500°C for 5 hours. After water quenching at room temperature, aging treatment is carried out at 160°C for 10 hours, and the high thermal conductivity and high strength aluminum alloy material can be prepared by standing and cooling.

[0059] Example 2

[0060] A high thermal conductivity and high strength aluminum alloy material, comprising the following preparation steps:

[0061] According to the formula in Table 1, the raw materials of aluminum, iron and nickel alloy are placed in a heating furnace and heated to melt;

[0062] After heating and melting, the temperature is raised to 800°C and the single crystal silicon is added to the heating furnace. After the temperature is kept at this temperature for 30 minutes, the temperature is lowered to 750°C.

[0063] Pure magnesium is added to the heating furnace after the temperature is lowered, the mixture is stirred and mixed, and a refining agent is added. Under ultrasonic-assisted modification, refining treatment and slag removal are carried out. The ultrasonic-assisted modification power is controlled to be 1150 W, and the treatment time is 90 s. After the slag removal is completed, the molten liquid is collected and poured into a mold, and solid solution is carried out at 525°C for 6 hours. After water quenching at room temperature, aging treatment is carried out at 170°C for 14 hours, and the high thermal conductivity and high strength aluminum alloy material can be prepared by standing and cooling.

[0064] Example 3

[0065] A high thermal conductivity and high strength aluminum alloy material, comprising the following preparation steps:

[0066] According to the formula in Table 1, the raw materials of aluminum, iron and nickel alloy are placed in a heating furnace and heated to melt;

[0067] After heating and melting, the temperature is raised to 800°C and the single crystal silicon is added to the heating furnace. After the temperature is kept at this temperature for 30 minutes, the temperature is lowered to 750°C.

[0068] Pure magnesium is added to the heating furnace after the temperature is lowered, the mixture is stirred and mixed, and a refining agent is added. Under ultrasonic-assisted modification, refining treatment and slag removal are carried out, the ultrasonic-assisted modification treatment power is controlled to be 900-1200W, and the treatment time is 80-100S. After the slag removal is completed, the molten liquid is collected and poured into a mold, and solid solution is carried out at 500-550°C for 5-7h. After water quenching at room temperature, aging treatment is carried out at 160-180°C for 10-18h, and the high thermal conductivity and high strength aluminum alloy material is prepared by standing and cooling.

[0069] Example 4

[0070] A high thermal conductivity and high strength aluminum alloy material, comprising the following preparation steps:

[0071] According to the formula in Table 1, the raw materials of aluminum, iron and nickel alloy are placed in a heating furnace and heated to melt;

[0072] After heating and melting, the temperature is raised to 800°C and the single crystal silicon is added to the heating furnace. After the temperature is kept at this temperature for 30 minutes, the temperature is lowered to 750°C.

[0073] Pure magnesium is added to the heating furnace after the temperature is lowered, the mixture is stirred and mixed, and a refining agent is added. Under ultrasonic-assisted modification, refining treatment and slag removal are carried out. The ultrasonic-assisted modification power is controlled to be 1150 W, and the treatment time is 90 s. After the slag removal is completed, the molten liquid is collected and poured into a mold, and solid solution is carried out at 525°C for 6 hours. After water quenching at room temperature, aging treatment is carried out at 170°C for 14 hours, and the high thermal conductivity and high strength aluminum alloy material can be prepared by standing and cooling.

[0074] Example 5

[0075] A high thermal conductivity and high strength aluminum alloy material, comprising the following preparation steps:

[0076] According to the formula in Table 1, the raw materials of aluminum, iron and nickel alloy are placed in a heating furnace and heated to melt;

[0077] After heating and melting, the temperature is raised to 800°C and the single crystal silicon is added to the heating furnace. After the temperature is kept at this temperature for 30 minutes, the temperature is lowered to 750°C.

[0078] Pure magnesium is added to the heating furnace after the temperature is lowered, the mixture is stirred and mixed, and a refining agent is added. Under ultrasonic-assisted modification, refining treatment and slag removal are carried out. The ultrasonic-assisted modification power is controlled to be 1150 W, and the treatment time is 90 s. After the slag removal is completed, the molten liquid is collected and poured into a mold, and solid solution is carried out at 525°C for 6 hours. After water quenching at room temperature, aging treatment is carried out at 170°C for 14 hours, and the high thermal conductivity and high strength aluminum alloy material can be prepared by standing and cooling.

[0079] Example 6

[0080] A high thermal conductivity and high strength aluminum alloy material, comprising the following preparation steps:

[0081] According to the formula in Table 1, the raw materials of aluminum, iron and nickel alloy are placed in a heating furnace and heated to melt;

[0082] After heating and melting, the temperature is raised to 800°C and the single crystal silicon is added to the heating furnace. After the temperature is kept at this temperature for 30 minutes, the temperature is lowered to 750°C.

[0083] Pure magnesium is added to the heating furnace after the temperature is lowered, the mixture is stirred and mixed, and a refining agent is added. Under ultrasonic-assisted modification, refining treatment and slag removal are carried out. The ultrasonic-assisted modification power is controlled to be 1150 W, and the treatment time is 90 s. After the slag removal is completed, the molten liquid is collected and poured into a mold, and solid solution is carried out at 525°C for 6 hours. After water quenching at room temperature, aging treatment is carried out at 170°C for 14 hours, and the high thermal conductivity and high strength aluminum alloy material can be prepared by standing and cooling.

[0084] Table 1 Group distribution ratio table

[0085]

[0086] Example 7

[0087] The difference from Example 4 is that in Example 7, 500 g of graphene is further added as a high thermal conductivity modifier.

[0088] Example 8

[0089] The difference from Example 4 is that in Example 8, 500 g of carbon nanotubes are further added as a high thermal conductivity modifier.

[0090] Example 9

[0091] The difference from Example 4 is that in Example 9, 500 g of 1000 mesh graphite particles are further added as a high thermal conductivity modifier.

[0092] Example 10

[0093] The difference from Example 4 is that in Example 7, 500 g of high thermal conductivity modifier 1 is further added.

[0094] Embodiment 11

[0095] The difference from Example 4 is that in Example 7, 500 g of high thermal conductivity modifier 2 is further added.

[0096] Example 12

[0097] The difference from Example 4 is that in Example 7, 500 g of high thermal conductivity modifier 3 is further added.

[0098] It should be noted that the metal elements in the metal deposition layer used in the present application include but are not limited to one of La, Sr, Ce or Er.

[0099] Performance Testing

[0100] The high thermal conductivity and high strength aluminum alloy materials prepared in Examples 1-12 were subjected to performance tests, specifically testing their thermal conductivity and tensile strength:

[0101] (1) Thermal conductivity: The thermal conductivity was tested using a HyperFlash LFA457 laser thermal conductivity meter.

[0102] (2) Tensile properties: The test method and sample size are in accordance with GB / T 228.1. The results are shown in Table 2 below:

[0103] Table 2 Performance test table

[0104]

[0105]

[0106] From the above examples 1-6, 7-9, 10-12, combined with the test results in Table 2, it can be found that:

[0107] The technical solutions of Examples 1-6 further illustrate that the technical solution of the present application optimizes the composition ratio of high thermal conductivity and high strength aluminum alloy materials, optimizes the content of each element, and adjusts the addition ratio of Si. The increase in Si content can improve the fluidity of the aluminum alloy, fill the shrinkage seams of the casting during casting, and can significantly improve the hardness and strength of the alloy. On this basis, the present application further selects the Ni element to transform the brittle flaky β-Al5FeSi intermetallic compound into an elongated Al9FeNi phase through a peritectic reaction, thereby inhibiting the formation of needle-like phases in the aluminum-silicon alloy, thereby improving the strength of the aluminum alloy material while improving the defect of its degraded thermal conductivity, thereby achieving the requirements of the aluminum alloy material for both good thermal conductivity and strength performance.

[0108] Comparing Examples 1-6 and Examples 7-9, it is illustrated that the technical solution of the present application adds carbon material as a high thermal conductivity modifier. Since carbon material has good thermal conductivity, it is filled into the interior of the aluminum alloy material to form a good thermal conduction path, which significantly reduces thermal resistance, increases thermal conductivity, and greatly improves heat dissipation performance. At the same time, the addition of a high thermal conductivity modifier mainly composed of carbon material can also effectively refine the alloy grains, thereby effectively enhancing the strength and rigidity of the material, so that the alloy can still maintain excellent mechanical properties in a high temperature environment.

[0109] Finally, by comparing Examples 10-12 with Examples 7-9, it is shown that the scheme of the present application technology optimizes the structure of the high thermal conductivity modifier. By setting a metal deposition layer on the surface of the high thermal conductivity modifier, the interface bonding force between the modifier and the aluminum matrix can be improved, and the overall performance of the material can be enhanced. This interface modification can not only improve thermal conductivity, but also significantly improve the strength, corrosion resistance and high temperature stability of the alloy material through La and Sr elements. At the same time, the above rare earth elements have excellent alloying effects. They can improve the microstructure of the material, improve grain refinement and uniformity of phase distribution, and thus enhance the mechanical properties and thermal stability of the alloy.

[0110] The present invention has been described in detail above in conjunction with specific implementations and exemplary examples, but these descriptions cannot be understood as limiting the present invention. Those skilled in the art understand that, without departing from the spirit and scope of the present invention, a variety of equivalent substitutions, modifications or improvements may be made to the technical solution of the present invention and its implementation methods, all of which fall within the scope of the present invention. The scope of protection of the present invention shall be subject to the attached claims.

[0111] All publications, patent applications, patents and other references mentioned in this specification are incorporated herein by reference. Unless otherwise defined, all technical and scientific terms used in this specification have the meanings conventionally understood by those skilled in the art. In the event of a conflict, the definition in this specification shall prevail.

[0112] When this specification uses the prefix "well-known to those skilled in the art", "prior art" or similar terms to introduce materials, substances, methods, steps, devices or components, etc., the objects introduced by the prefix cover those commonly used in the art when this application is filed, but also include those that are not commonly used at present but will become recognized in the art as being suitable for similar purposes.

[0113] In the context of the present specification, any matters or items not mentioned are directly applicable to those known in the art without any changes except those explicitly stated.

Claims

1. A high thermal conductivity and high strength aluminum alloy material, characterized in that: It is composed of the following percentage elements: The balance is Al.

2. The high thermal conductivity and high strength aluminum alloy material according to claim 1, characterized in that: The high thermal conductivity and high strength aluminum alloy material is further added with a high thermal conductivity modifier, and the high thermal conductivity modifier includes at least one of graphene, carbon nanotubes or graphite particles.

3. The high thermal conductivity and high strength aluminum alloy material according to claim 2, characterized in that: The surface of the high thermal conductivity modifier is coated with an interface modification layer, and the interface modification layer includes a metal deposition layer.

4. The high thermal conductivity and high strength aluminum alloy material according to claim 3, characterized in that: The metal element in the metal deposition layer includes at least one of La, Sr, Ce or Er.

5. The high thermal conductivity and high strength aluminum alloy material according to claim 3, characterized in that: The surface of the high thermal conductivity modifier is coated with a lanthanum-cerium coating layer, and the high thermal conductivity modifier is made by the following technical solution: Place lanthanum cerium carbonate in deionized water, add nitric acid to adjust the pH, stir and mix, add urea and hexadecyltrimethylammonium bromide, collect the mixed solution, place the graphene solution in the mixed solution, ultrasonically disperse and collect the dispersed slurry, filter and collect the filter cake; The filter cake is placed in a vacuum furnace, and after passing protective gas, heat-treated in a high temperature environment for 1-2 hours, and then allowed to stand and cool to room temperature, so as to prepare the high thermal conductivity modifier.

6. The high thermal conductivity and high strength aluminum alloy material according to claim 5, characterized in that: The heat treatment temperature is 1000-1100°C.

7. A method for preparing a high thermal conductivity and high strength aluminum alloy material according to any one of claims 1 to 6, characterized in that: The method comprises the following preparation steps: The raw materials of aluminum, iron and nickel alloy are placed in a heating furnace according to the formula, and heated and melted; After heating and melting, the single crystal silicon is added to the heating furnace, and then the temperature is kept and cooled; Pure magnesium is added to the heating furnace after the temperature is reduced, and the mixture is stirred and mixed, and a refining agent and a high thermal conductivity modifier are added. The mixture is refined and slag is removed, and the molten liquid is collected and poured into a mold, and the high thermal conductivity and high strength aluminum alloy material is prepared by standing and cooling.

8. The method for preparing a high thermal conductivity and high strength aluminum alloy material according to claim 7, characterized in that: The refining process also includes an ultrasonic-assisted modification process, wherein the power of the ultrasonic-assisted modification process is 900-1200 W and the processing time is 80-100 S.

9. The method for preparing a high thermal conductivity and high strength aluminum alloy material according to claim 7, characterized in that: It also includes a solution treatment and an aging treatment, wherein the solution treatment and the aging treatment include the following steps: Solution treatment is carried out at 500-550℃ for 5-7h, water quenching is carried out at room temperature, and then aging treatment is carried out at 160-180℃ for 10-18h.

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