Modified graphene reinforced aluminum alloy composite material and preparation method thereof

Abstract

The invention relates to the technical field of metal composite materials, and discloses a modified graphene reinforced aluminum alloy composite material and a preparation method thereof.The preparation method comprises the steps that zirconium hydroxide is loaded on graphene oxide through a hydrothermal reaction, then zirconium oxide modified graphene oxide is obtained through high-temperature sintering treatment, then reduction treatment is conducted in the hydrogen atmosphere, and the modified graphene reinforced aluminum alloy composite material is obtained. The preparation method comprises the following steps: preparing zirconium-modified graphene, then doping a boron element by adopting an ion implantation process to obtain composite modified graphene, doping zirconium, zirconium (Zr) and aluminum to form an Al3Zr compound, so that the recrystallization process can be hindered, recrystallized grains can be refined, and the generation of an aluminum carbide phase can be inhibited; by doping the boron element, the wettability between graphene and an aluminum alloy melt is improved, the uniform dispersity of graphene in an aluminum alloy matrix can be effectively improved, meanwhile, boron serves as a grain refiner and acts together with zirconium, the grain refinement effect can be further enhanced, and therefore the strength and plasticity of the aluminum alloy are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metal composite materials, and particularly relates to a modified graphene reinforced aluminum alloy composite material and a preparation method thereof. BACKGROUND

[0002] Aluminum is a silvery white metal, light in weight, with good ductility, electrical conductivity, thermal conductivity, heat resistance and radiation resistance. The surface of aluminum in the air will form a dense oxide film, so that aluminum has good corrosion resistance. The content of aluminum in the earth's crust is second only to oxygen and silicon, ranking third, and it is the most abundant metal element in the earth's crust. Because of its abundance and good performance, aluminum is often made into rods, sheets, foils, powders, strips and wires and widely used in aviation, machinery, construction, automobiles, ships and marine structures, power and other important industrial fields.

[0003] Aluminum has attracted much attention due to its light weight, high specific strength, good anti-corrosion performance and easy recycling. However, it also has weaknesses such as softness and poor wear resistance, which makes it unsuitable for high-performance structural materials. Through long-term production practice and scientific experiments, people gradually add alloy elements and use heat treatment to improve the performance of aluminum, which results in a series of aluminum alloys, such as silicon-doped and magnesium-doped cast aluminum alloys. The addition of certain elements to the alloy can not only maintain the lightness of pure aluminum, but also have high hardness and wear resistance. This makes its mechanical properties superior to many alloy steels, making it an ideal structural material, widely used in mechanical manufacturing, transportation machinery, power machinery, aviation industry, shipbuilding industry and marine facilities. The fuselage, skin and compressor of the aircraft, as well as the ship above the waterline, are often made of aluminum alloy to reduce weight. The use of aluminum alloy instead of steel plate material for welding can reduce the structure weight by more than 50%.

[0004] With the rapid development of industry, higher and higher requirements are put forward for the performance of aluminum alloy, and aluminum alloy with higher hardness and wear resistance has become the focus of development. Graphene has excellent electrical conductivity, thermal conductivity and super strong mechanical properties, so graphene is considered to be an excellent reinforcing body for aluminum alloy. However, the interface between graphene and many metal materials is weak, especially the interface between aluminum matrix and graphene. At the same time, when the temperature is too high, aluminum and graphene will react to form a brittle phase of aluminum carbide, which will damage the crystal structure of graphene and lead to poor strengthening effect. Therefore, it is extremely important and urgent to find a new aluminum alloy strengthening material for the large-scale application of aluminum alloy in various industries.

[0005] The Chinese patent document CN201910868238.9 discloses a method for preparing a cesium oxide modified graphene reinforced aluminum alloy composite material, comprising the following steps: first, a graphene aluminum alloy powder prefabricated block with a mass content of 210% of cesium oxide modified graphene is prepared by using a liquid dispersion technology, then the prefabricated block is added to an aluminum alloy melt, after melting, the aluminum alloy melt is stirred and dispersed at a mechanical stirring rate of 50-150 rpm for 1-3 min, and then an aluminum alloy composite material reinforced by cesium oxide modified graphene with a mass content of 0.1-1% is prepared by using a casting process under the condition of 650-700 DEG C. By using the above method, the uniform dispersibility of graphene in the aluminum matrix can be effectively improved, and the mechanical properties of the aluminum-based composite material are improved to a certain extent, but further improvement is still needed. SUMMARY

[0006] In view of the deficiencies of the prior art, the purpose of the present application is to provide a modified graphene reinforced aluminum alloy composite material and a preparation method thereof.

[0007] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions: A preparation method of a modified graphene reinforced aluminum alloy composite material, comprising the following steps: S1, preparing zirconium oxide modified graphene oxide The graphene oxide is dispersed in deionized water, then zirconium oxychloride and urea are added thereto, and after uniform stirring, a hydrothermal reaction is carried out. After the reaction is completed, dialysis, freeze-drying and high-temperature sintering treatment are carried out to obtain zirconium oxide modified graphene oxide.

[0008] In this step, the mass ratio of graphene oxide, zirconium oxychloride and urea is 4-8:1-2:5-10. In some embodiments of the present application, for example, 4:1:5, 4:1:8, 4:1:10, 4:2:8, 4:2:10, 6:1:5, 6:2:10, 8:1:5, 8:2:10 can be selected, but the values listed are not limited, and other values not listed within the value range are also applicable.

[0009] In this step, the temperature of the hydrothermal reaction is 90-120 DEG C, for example, 90 DEG C, 95 DEG C, 100 DEG C, 105 DEG C, 110 DEG C, 115 DEG C, 120 DEG C can be selected; the time of the hydrothermal reaction is 2-5 h, for example, 2 h, 2.5 h, 3 h, 3.5 h, 4 h, 4.5 h, 5 h can be selected; but the values listed are not limited, and other values not listed within the value range are also applicable.

[0010] In this step, dialysis is carried out in deionized water, and the dialysis time is 12-24 h.

[0011] In this step, the temperature of the high-temperature sintering treatment is 500-600°C, for example, 500°C, 520°C, 540°C, 550°C, 560°C, 570°C, 580°C, 590°C, 600°C can be selected; the time of the high-temperature sintering treatment is 2-3h, for example, 2h, 2.5h, 3h can be selected, but not limited to the listed values, other values not listed in the value range are also applicable.

[0012] S2, preparation of zirconium modified graphene The zirconium oxide modified graphene oxide is subjected to reduction treatment in a hydrogen atmosphere to obtain zirconium modified graphene.

[0013] In this step, the temperature of the reduction treatment is 650-750°C, for example, 650°C, 660°C, 680°C, 700°C, 720°C, 750°C can be selected; the time of the reduction treatment is 2-4h, for example, 2h, 3h, 4h can be selected; the hydrogen flow rate is 15-20L / min, for example, 15L / min, 16L / min, 17L / min, 18L / min, 19L / min, 20L / min can be selected, but not limited to the listed values, other values not listed in the value range are also applicable.

[0014] S3, preparation of composite modified graphene The boron element is injected into the surface of the zirconium modified graphene by ion implantation process to obtain composite modified graphene.

[0015] In this step, the parameters of the ion implantation process are: vacuum degree 2x10 -3 ~2.5x10 -3 Pa, voltage 43-45keV, current 1.8-2mA, boron element dose 4x10 18 ~6x10 18 cm 2 .

[0016] S4, preparation of mixed powder The composite modified graphene and aluminum alloy powder are subjected to ball milling treatment, and a surfactant stearic acid is added during the ball milling process to obtain a mixed powder.

[0017] In this step, the mass ratio of the composite modified graphene, aluminum alloy powder and stearic acid is 2-5:100:0.05-0.1, for example, 2:100:0.05, 2:100:0.1, 2:100:0.05, 4:100:0.08, 5:100:0.1 can be selected, but not limited to the listed values, other values not listed in the value range are also applicable.

[0018] In the step, the ball milling rotation speed is 400-800 r / min, for example, 400 r / min, 500 r / min, 600 r / min, 700 r / min, 800 r / min can be selected; the ball milling time is 12-18 h, for example, 12 h, 13 h, 14 h, 15 h, 16 h, 17 h, 18 h can be selected, but not limited to the listed values, other values not listed in the value range are also applicable.

[0019] S5, preparing modified graphene reinforced aluminum alloy composite material The mixed powder is added into the aluminum alloy melt, after melting, stirring and dispersing uniformly, and after cooling and solidification, the modified graphene reinforced aluminum alloy composite material is obtained.

[0020] In the step, the temperature of the aluminum alloy melt is 650-680℃.

[0021] In the step, the mass ratio of the mixed powder and the aluminum alloy melt is 1-5:100, for example, 1:100, 2:100, 3:100, 4:100, 5:100 can be selected, but not limited to the listed values, other values not listed in the value range are also applicable.

[0022] In the step, the stirring rate is 200-400 r / min, for example, 200 r / min, 250 r / min, 300 r / min, 350 r / min, 400 r / min can be selected; the stirring time is 5-10 min, for example, 5 min, 6 min, 7 min, 8 min, 9 min, 10 min can be selected, but not limited to the listed values, other values not listed in the value range are also applicable.

[0023] The application also provides a modified graphene reinforced aluminum alloy composite material prepared by the above preparation method.

[0024] Compared with the prior art, the application has the following beneficial effects: If graphene is directly added into the aluminum alloy, the dispersibility of graphene is poor, and the aggregation phenomenon is easy to occur, which reduces the performance of the alloy material; meanwhile, when the temperature is too high, aluminum and graphene will react to generate aluminum carbide brittle phase, which destroys the performance of the alloy material. The zirconium modified graphene is obtained by the hydrothermal reaction of loading zirconium hydroxide on graphene oxide and then high-temperature sintering treatment, and then reduction treatment in a hydrogen atmosphere is performed to obtain the zirconium modified graphene, and then boron elements are doped into the zirconium modified graphene by ion implantation process to obtain the composite modified graphene. By doping zirconium, the zirconium (Zr) and aluminum form Al3Zr compound, which can hinder the recrystallization process and refine the recrystallized grains, and can inhibit the generation of aluminum carbide phase; by doping boron elements, the wettability between graphene and aluminum alloy melt is improved, which can effectively improve the uniform dispersibility of graphene in the aluminum alloy matrix, and boron as a grain refiner, together with zirconium, can further enhance the grain refinement effect, thereby improving the strength and plasticity of the aluminum alloy. DETAILED DESCRIPTION

[0025] The application will be further described in detail through specific preferred embodiments, but the application is not limited to the following embodiments.

[0026] It should be noted that, unless otherwise specified, the chemical reagents involved in the application are purchased through commercial channels.

[0027] The graphene oxide used in the application has a CAS number of 7782-42-5, a thickness of 0.55-1.2 nm, and a diameter of 0.5-2 μm; the aluminum alloy powder is 6061 aluminum alloy powder with a mesh number of 500, which is purchased from Changsha Tianjiu Metal Material Co., Ltd.

[0028] Example 1 A preparation method of a modified graphene reinforced aluminum alloy composite material, comprising the following steps: S1, 4g of graphene oxide is dispersed in 200mL of deionized water, then 1g of zirconium oxychloride and 5g of urea are added thereto, and after stirring uniformly, hydrothermal reaction is performed, the temperature of the hydrothermal reaction is 90℃, and the time of the hydrothermal reaction is 5h, after the reaction is completed, dialysis in deionized water is performed for 12h, then freeze-drying is performed, and then high-temperature sintering at 500℃ for 3h is performed to obtain zirconium oxide modified graphene oxide; S2, the zirconium oxide modified graphene oxide is subjected to reduction treatment in a hydrogen atmosphere, the temperature of the reduction treatment is 650℃, the time of the reduction treatment is 4h, and the hydrogen flow rate is 15L / min to obtain zirconium modified graphene; S3, boron elements are implanted into the surface of the zirconium modified graphene by ion implantation process, and the parameters of the ion implantation process are as follows: vacuum degree is 2×10 -3Pa, voltage is 45keV, current is 2mA, the dose of boron element is 5*10 18 Pa, voltage is 45keV, current is 2mA, the dose of boron element is 5*10 2 Pa, voltage is 45keV, current is 2mA, the dose of boron element is 5*10 S4, 2g of the composite modified graphene and 100g of aluminum alloy powder are ball milled at a rotation speed of 400r / min for 18h, and 0.05g of a surfactant stearic acid is added during the ball milling to obtain a mixed powder; S5, the aluminum alloy powder is added into a graphite crucible and heated to 750℃, and after the aluminum alloy powder is completely melted, the surface slag of the melt is removed after 5min, to obtain an aluminum alloy melt, and then the temperature of the aluminum alloy melt is increased to 680℃, the mixed powder is added into the aluminum alloy melt, and the mass ratio of the mixed powder and the aluminum alloy melt is 1:100, after melting, the mixed powder is uniformly dispersed by stirring at a stirring rate of 400r / min for 5min, and the modified graphene reinforced aluminum alloy composite material is obtained after cooling and solidification.

[0029] Example 2 A preparation method of a modified graphene reinforced aluminum alloy composite material, comprising the following steps: S1, 6g of graphene oxide is dispersed in 200mL of deionized water, then 2g of zirconium oxychloride and 8g of urea are added, and after stirring uniformly, a hydrothermal reaction is carried out at a temperature of 120℃ for 2h, after the reaction is completed, dialysis is carried out in deionized water for 24h, and then freeze-drying is carried out, and then high-temperature sintering is carried out at 500℃ for 3h to obtain zirconium oxide modified graphene oxide; S2, the zirconium oxide modified graphene oxide is reduced in a hydrogen atmosphere at a temperature of 750℃ for 2h, and the hydrogen flow rate is 20L / min to obtain zirconium modified graphene; S3, boron element is implanted into the surface of the zirconium modified graphene by ion implantation process, and the parameters of the ion implantation process are as follows: vacuum degree is 2*10 -3 Pa, voltage is 45keV, current is 2mA, the dose of boron element is 5*10 18 Pa, voltage is 45keV, current is 2mA, the dose of boron element is 5*10 2 Pa, voltage is 45keV, current is 2mA, the dose of boron element is 5*10 S4, 2g of the composite modified graphene and 100g of aluminum alloy powder are ball milled at a rotation speed of 400r / min for 18h, and 0.05g of a surfactant stearic acid is added during the ball milling to obtain a mixed powder; S5, the aluminum alloy powder is added into the graphite crucible, heated to 750 DEG C, after it is completely melted, stand for 5 min, remove the surface dross of the melt, get the aluminum alloy melt, then the temperature of the aluminum alloy melt is raised to 680 DEG C, the mixed powder is added into the aluminum alloy melt, the mass ratio of the mixed powder and the aluminum alloy melt is 2:100, after melting, stir and disperse uniformly, the stirring rate is 400 r / min, the stirring time is 5 min, after cooling and solidification, the modified graphene reinforced aluminum alloy composite material is obtained.

[0030] Example 3 A preparation method of a modified graphene reinforced aluminum alloy composite material, comprising the following steps: S1, 8g of graphene oxide is dispersed in 200mL of deionized water, then 2g of zirconium oxychloride and 10g of urea are added, after stirring uniformly, hydrothermal reaction is carried out, the temperature of the hydrothermal reaction is 100 DEG C, the time of the hydrothermal reaction is 3h, after the reaction is completed, dialysis in deionized water is carried out for 24h, then freeze-drying is carried out, then high-temperature sintering at 500 DEG C for 3h is carried out, zirconium oxide modified graphene oxide is obtained; S2, the zirconium oxide modified graphene oxide is reduced in a hydrogen atmosphere, the temperature of the reduction treatment is 700 DEG C, the time of the reduction treatment is 3h, the hydrogen flow rate is 20L / min, zirconium modified graphene is obtained; S3, boron elements are implanted into the surface of the zirconium modified graphene by ion implantation process, the parameters of the ion implantation process are: vacuum degree is 2x10 -3 Pa, voltage is 45keV, current is 2mA, the dose of boron elements is 5x10 18 cm 2 , the composite modified graphene is obtained; S4, 3g of the composite modified graphene and 100g of aluminum alloy powder are ball milled, the ball milling speed is 400r / min, the ball milling time is 18h, at the same time, 0.1g of surfactant stearic acid is added during the ball milling process, the mixed powder is obtained; S5, the aluminum alloy powder is added into the graphite crucible, heated to 750 DEG C, after it is completely melted, stand for 5 min, remove the surface dross of the melt, get the aluminum alloy melt, then the temperature of the aluminum alloy melt is raised to 680 DEG C, the mixed powder is added into the aluminum alloy melt, the mass ratio of the mixed powder and the aluminum alloy melt is 2:100, after melting, stir and disperse uniformly, the stirring rate is 400 r / min, the stirring time is 5 min, after cooling and solidification, the modified graphene reinforced aluminum alloy composite material is obtained.

[0031] Example 4 A preparation method of a modified graphene reinforced aluminum alloy composite material, comprising the following steps: S1, disperse 5 g of graphene oxide in 200 mL of deionized water, then add 1.5 g of zirconium oxychloride and 6 g of urea to it, stir uniformly and then perform hydrothermal reaction, the temperature of the hydrothermal reaction is 100℃, the time of the hydrothermal reaction is 3h, after the reaction is completed, dialysis in deionized water for 24h, then freeze-drying, followed by high-temperature sintering at 500℃ for 3h, to obtain zirconium oxide modified graphene oxide; S2, reduce the zirconium oxide modified graphene oxide in a hydrogen atmosphere, the reduction treatment temperature is 700℃, the reduction treatment time is 3h, the hydrogen flow rate is 20L / min, to obtain zirconium modified graphene; S3, use ion implantation process to implant boron element into the surface of zirconium modified graphene, the parameters of ion implantation process: vacuum degree is 2×10 -3 Pa, voltage is 45keV, current is 2mA, the dose of boron element is 5×10 18 cm 2 , to obtain composite modified graphene; S4, ball mill 4g of composite modified graphene and 100g of aluminum alloy powder, the ball milling speed is 400r / min, the ball milling time is 18h, and 0.1g of surfactant stearic acid is added during the ball milling process, to obtain a mixed powder; S5, add the aluminum alloy powder to a graphite crucible, heat to 750℃, after it is completely melted, stand for 5min, remove the surface dross of the melt, to obtain an aluminum alloy melt, then raise the temperature of the aluminum alloy melt to 680℃, add the mixed powder to the aluminum alloy melt, the mass ratio of the mixed powder to the aluminum alloy melt is 5:100, after melting, stir and disperse uniformly, the stirring rate is 400r / min, the stirring time is 5min, after cooling and solidification, the modified graphene reinforced aluminum alloy composite material is obtained.

[0032] Comparative Example 1 A preparation method of an aluminum alloy composite material, comprising the following steps: add the aluminum alloy powder to a graphite crucible, heat to 750℃, after it is completely melted, stand for 5min, remove the surface dross of the melt, to obtain an aluminum alloy melt, then raise the temperature of the aluminum alloy melt to 680℃, add graphene powder (single-layer graphene, the longest width in x-y plane is 10μm, carbon content is greater than 98.0%), boron powder (800 mesh, purity is 99.9%) and zirconium particles (particle size is 1mm, purity is 99.99%) to the aluminum alloy melt, the addition amount of graphene powder is 0.06wt% based on the mass of aluminum alloy melt, the addition amount of boron powder is 0.03wt%, the addition amount of zirconium particles is 0.03wt%, stir and disperse uniformly, the stirring rate is 400r / min, the stirring time is 5min, after cooling and solidification, the aluminum alloy composite material is obtained.

[0033] In comparison with Example 3, graphene powder, boron powder and zirconium particles are directly added into the aluminum alloy melt.

[0034] Comparative Example 2 A preparation method of a modified graphene reinforced aluminum alloy composite material, comprising the following steps: S1, graphene oxide is reduced in a hydrogen atmosphere, the reduction temperature is 700℃, the reduction time is 3h, the hydrogen flow rate is 20L / min, and reduced graphene oxide is obtained; S2, boron elements are implanted into the surface of the reduced graphene oxide by ion implantation process, the parameters of the ion implantation process are: vacuum degree is 2x10 -3 Pa, voltage is 45keV, current is 2mA, and the dose of boron elements is 5x10 18 2 , and boron modified graphene is obtained; S3, 3g of boron modified graphene and 100g of aluminum alloy powder are subjected to ball milling treatment, the ball milling speed is 400r / min, the ball milling time is 18h, and 0.1g of a surfactant stearic acid is added during the ball milling process, and a mixed powder is obtained; S4, the aluminum alloy powder is added into a graphite crucible, and heated to 750℃, after the aluminum alloy powder is completely melted, it is statically placed for 5min, the surface slag of the melt is removed, and an aluminum alloy melt is obtained, then the temperature of the aluminum alloy melt is increased to 680℃, the mixed powder is added into the aluminum alloy melt, the mass ratio of the mixed powder and the aluminum alloy melt is 4:100, after melting, the mixed powder is uniformly dispersed by stirring at a stirring rate of 400r / min for 5min, and after cooling and solidification, a modified graphene reinforced aluminum alloy composite material is obtained.

[0035] In comparison with Example 3, no zirconium doping modification treatment is performed.

[0036] Comparative Example 3 A preparation method of a modified graphene reinforced aluminum alloy composite material, comprising the following steps: S1, 8g of graphene oxide is dispersed in 200mL of deionized water, then 2g of zirconium oxychloride and 10g of urea are added thereto, after uniform stirring, hydrothermal reaction is performed, the hydrothermal reaction temperature is 100℃, the hydrothermal reaction time is 3h, after the reaction is completed, dialysis is performed in deionized water for 24h, then freeze-drying is performed, and subsequently high-temperature sintering is performed at 500℃ for 3h, and zirconium oxide modified graphene oxide is obtained; S2, the zirconium oxide modified graphene oxide is reduced in a hydrogen atmosphere, the reduction temperature is 700℃, the reduction time is 3h, and the hydrogen flow rate is 20L / min, and zirconium modified graphene is obtained; ​S3, 3 g of zirconium modified graphene and 100 g of aluminum alloy powder were ball milled at a rotation speed of 400 r / min for 18 h, and 0.1 g of a surfactant stearic acid was added during the ball milling process to obtain a mixed powder; S4, the aluminum alloy powder was added to a graphite crucible and heated to 750℃, and after it was completely melted, it was allowed to stand for 5 min, and the surface slag of the melt was removed to obtain an aluminum alloy melt. Then the temperature of the aluminum alloy melt was raised to 680℃, and the mixed powder was added to the aluminum alloy melt, and the mass ratio of the mixed powder to the aluminum alloy melt was 4:100. After melting, the mixture was uniformly dispersed by stirring at a stirring rate of 400 r / min for 5 min. After cooling and solidification, a modified graphene reinforced aluminum alloy composite material was obtained.

[0037] Comparative Example 3 and Example 3 were compared, and no boron doping modification treatment was performed.

[0038] Comparative Example 4 A preparation method of a graphene reinforced aluminum alloy composite material, comprising the following steps: S1, graphene oxide was reduced in a hydrogen atmosphere at a temperature of 700℃ for 3 h with a hydrogen flow rate of 20 L / min to obtain reduced graphene oxide; S2, 3 g of reduced graphene oxide and 100 g of aluminum alloy powder were ball milled at a rotation speed of 400 r / min for 18 h, and 0.1 g of a surfactant stearic acid was added during the ball milling process to obtain a mixed powder; S3, the aluminum alloy powder was added to a graphite crucible and heated to 750℃, and after it was completely melted, it was allowed to stand for 5 min, and the surface slag of the melt was removed to obtain an aluminum alloy melt. Then the temperature of the aluminum alloy melt was raised to 680℃, and the mixed powder was added to the aluminum alloy melt, and the mass ratio of the mixed powder to the aluminum alloy melt was 4:100. After melting, the mixture was uniformly dispersed by stirring at a stirring rate of 400 r / min for 5 min. After cooling and solidification, a modified graphene reinforced aluminum alloy composite material was obtained.

[0039] Comparative Example 4 and Example 4 were compared, and no doping modification treatment was performed on the graphene oxide.

[0040] The composite materials prepared in Examples 1-4 and Comparative Examples 1-4 were tested for performance, and the specific steps were as follows: Tensile strength and yield strength test: tested according to GB / T 228.1-2021 standard; Impact test test: the composite material is processed into a sample with a size of 55mmx25mmx5mm, the test equipment is JK KC type impact testing machine, the test temperature is room temperature, the impact absorption work of the sample is recorded, the test is carried out three times, and the average value is taken as the result; Wear test test: the composite material is processed into a sample with a size of 20mmx20mmx20mm, which is carried out on a TRM500 type friction testing machine, the working load is 90N, the grinding wheel rotating speed is 320r / min, the test temperature is room temperature, the relative sliding speed is 100mm / min, the wear time is 15min, the average value is taken as the result, and the test result is shown in table 1.

[0041] Table 1 test results of mechanical properties of different groups Finally, it needs to be pointed out that: the above examples do not limit the present application in any form. For those skilled in the art, some modifications and improvements can be made on the basis of the present application. Therefore, any modification or improvement made without departing from the spirit of the present application shall fall within the scope of the present application.

Claims

1. A method for preparing a modified graphene reinforced aluminum alloy composite material, characterized in that: The steps include: S1, dispersing graphene oxide in deionized water, then adding zirconium oxychloride and urea thereto, stirring evenly and then conducting a hydrothermal reaction. After the reaction is completed, dialyzing, freeze-drying, and high-temperature sintering are performed to obtain zirconium oxide-modified graphene oxide; S2, reducing the zirconium oxide-modified graphene oxide in a hydrogen atmosphere to obtain zirconium-modified graphene; S3, using an ion implantation process to implant boron into the surface of the zirconium-modified graphene to obtain composite modified graphene; S4, ball-milling the composite modified graphene and aluminum alloy powder, and adding a surfactant, stearic acid, during the ball-milling process to obtain a mixed powder; S5. Add the mixed powder into the aluminum alloy melt, stir and disperse it evenly after melting, and obtain the modified graphene reinforced aluminum alloy composite material after cooling and solidification.

2. The preparation method according to claim 1, characterized in that In step S1, the mass ratio of graphene oxide, zirconium oxychloride and urea is 4-8:1-2:5-10.

3. The preparation method according to claim 1, characterized in that In step S1, the temperature of the hydrothermal reaction is 90-120° C., and the time of the hydrothermal reaction is 2-5 hours.

4. The preparation method according to claim 1, characterized in that In step S2, the temperature of the reduction treatment is 650-750°C, the time of the reduction treatment is 2-4 hours, and the hydrogen flow rate is 15-20 L / min.

5. The preparation method according to claim 1, characterized in that In step S3, the parameters of the ion implantation process are: vacuum degree is 2×10 -3 ~2.5×10 -3 Pa, the voltage is 43~45keV, the current is 1.8~2mA, and the dose of boron is 4×10 18 ~6×10 18 pieces / cm 2 .

6. The preparation method according to claim 1, characterized in that In step S4, the mass ratio of the composite modified graphene, the aluminum alloy powder and the stearic acid is 2-5:100:0.05-0.

1.

7. The preparation method according to claim 1, characterized in that In step S4, the ball milling speed is 400-800 r / min, and the ball milling time is 12-18 h.

8. The preparation method according to claim 1, characterized in that In step S5, the mass ratio of the mixed powder to the aluminum alloy melt is 1-5:

100.

9. The modified graphene reinforced aluminum alloy composite material prepared by the preparation method according to any one of claims 1 to 8.

Images