AU2021105915A4 - Graphene reinforced aluminum matrix composite material with high conductivity and preparation method thereof - Google Patents
Graphene reinforced aluminum matrix composite material with high conductivity and preparation method thereof Download PDFInfo
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 112
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 107
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 79
- 229910021389 graphene Inorganic materials 0.000 title claims abstract description 76
- 239000011159 matrix material Substances 0.000 title claims abstract description 33
- 239000002131 composite material Substances 0.000 title claims abstract description 31
- 238000002360 preparation method Methods 0.000 title claims abstract description 21
- 239000007788 liquid Substances 0.000 claims abstract description 24
- 239000000843 powder Substances 0.000 claims abstract description 19
- 238000010438 heat treatment Methods 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 15
- 238000012360 testing method Methods 0.000 claims abstract description 13
- 238000005242 forging Methods 0.000 claims abstract description 11
- 238000000137 annealing Methods 0.000 claims abstract description 10
- 238000007711 solidification Methods 0.000 claims abstract description 10
- 230000008023 solidification Effects 0.000 claims abstract description 10
- 239000011261 inert gas Substances 0.000 claims abstract description 7
- 238000007772 electroless plating Methods 0.000 claims abstract description 6
- 230000008018 melting Effects 0.000 claims abstract description 6
- 238000002844 melting Methods 0.000 claims abstract description 6
- 238000001816 cooling Methods 0.000 claims abstract description 5
- 238000007747 plating Methods 0.000 claims abstract description 5
- 238000005266 casting Methods 0.000 claims abstract description 4
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 4
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 239000001307 helium Substances 0.000 claims description 2
- 229910052734 helium Inorganic materials 0.000 claims description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 16
- 230000000052 comparative effect Effects 0.000 description 6
- 229910000838 Al alloy Inorganic materials 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000003575 carbonaceous material Substances 0.000 description 3
- 238000004512 die casting Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- -1 aluminum ions Chemical class 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 238000001755 magnetron sputter deposition Methods 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- RQMIWLMVTCKXAQ-UHFFFAOYSA-N [AlH3].[C] Chemical compound [AlH3].[C] RQMIWLMVTCKXAQ-UHFFFAOYSA-N 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000005269 aluminizing Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000005685 electric field effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000001235 sensitizing effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/007—Semi-solid pressure die casting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
- B22D17/2015—Means for forcing the molten metal into the die
- B22D17/2069—Exerting after-pressure on the moulding material
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/10—Alloys containing non-metals
- C22C1/1036—Alloys containing non-metals starting from a melt
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/10—Alloys containing non-metals
- C22C1/1036—Alloys containing non-metals starting from a melt
- C22C1/1073—Infiltration or casting under mechanical pressure, e.g. squeeze casting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/12—Making non-ferrous alloys by processing in a semi-solid state, e.g. holding the alloy in the solid-liquid phase
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/02—Alloys based on aluminium with silicon as the next major constituent
- C22C21/04—Modified aluminium-silicon alloys
Abstract
The invention discloses graphene reinforced aluminum-based composite material
with high conductivity and a preparation method thereof, which comprises the following
steps: Firstly, chemically plating aluminum on the surface of graphene by using an
electroless plating method to obtain aluminized graphene powder. Then that aluminum
block are melted into aluminum liquid in a crucible furnace, and then the mold is heat
to a temperature lower than the melting point of aluminum. Alternately pouring
aluminum liquid and aluminized graphene powder into a mold for layered casting to
obtain a sandwich structure consisting of an aluminum liquid solidification layer and
an aluminized graphene powder layer. Extruding the sandwich structure into a cuboid
test block, heating to 500-600 0C, keeping the temperature for a certain time, and
forging. After cooling to room temperature, carry out longitudinal cold deformation.
Finally, annealing treatment is carried out under the protection of inert gas to obtain
the graphene reinforced aluminum matrix composite material with high conductivity.
According to the invention, the problem of poor wettability between graphene and
aluminum-based materials is effectively solved, graphene is uniformly dispersed in the
aluminum-based materials, and the strength of the aluminum-based materials is
effectively improved on the premise of keeping high conductivity of the aluminum
matrix.
Description
Graphene reinforced aluminum matrix composite material with high conductivity and preparation method thereof
TECHNICAL FIELD The invention belongs to the technical field of aluminum alloy smelting and rolling in metallurgical industry, and relates to preparation method for improving the conductivity and strength of aluminum materials, particularly relates to a graphene reinforced aluminum matrix composite material and a preparation method thereof, which mainly solve the problem that the electrical conductivity of aluminum gradually decreases with the increase of strength.
BACKGROUND Pure aluminum has been paid attention to because of its low density, low melting point, strong anti-corrosion ability, good thermal conductivity and electrical conductivity, etc. The aluminum alloy derived from it has good plasticity and can be processed into various profiles, which is widely used in industry and is second only to steel, and has become an indispensable alloy system in the material field. With the development of economy and the progress of society, the technical expectation of aluminum-based materials is getting higher and higher. For embodiment, in the fast-developing electric power and aerospace fields, aluminum-based materials, as light conductor materials, hope to improve the strength of aluminum-based materials while ensuring that their conductivity is maintained at a high level. Alloy elements have a significant effect on improving the mechanical properties of aluminum matrix, but at the same time, they will lead to a sharp decline in conductivity. Since the successful preparation of carbon materials, basic research and engineering application research related to carbon materials have also become research hotspots in recent years. Carbon materials with different morphologies and structures have their unique mechanical, electrical, chemical and optical properties, which are highly valued by the material field. The electron mobility of graphene exceeds 1.5m2 N.s, which is much higher than that of copper (0.0032m2 N.s) and aluminum (0.0015m N.s). 2
However, graphene and aluminum-based materials have poor wettability and weak binding force, so it is difficult to uniformly disperse. How to uniformly disperse graphene into aluminum matrix and effectively improve the strength of aluminum-based materials while maintaining high conductivity of aluminum matrix is an urgent technical problem. After retrieval, Chinese Patent PublicationNo. CN11101013a discloses a new preparation method of graphene aluminum composite material and graphene aluminum composite material. The realization method is to form an aluminum film on graphene powder by magnetron sputtering to obtain modified graphene powder; Adding the modified graphene powder into molten aluminum liquid and stirring to uniformly disperse the modified graphene powder in the aluminum liquid to obtain a mixed system; And curing and molding the mixed system. In this method, magnetron sputtering is used to coat the powder, which has complicated process, difficult operation and high cost. Patent document with publication number CN109402442A provides a die-casting preparation method of graphene reinforced aluminum matrix composite material, which is realized by adopting a semi-solid die-casting method, and smelting, heat preservation, electromagnetic stirring, compaction and die-casting to prepare graphene reinforced aluminum matrix composite material. The hardness, tensile strength and elongation of the composite material are 85HB, 245MPa and 8%, respectively. The semi-solid aluminum alloy ingot prepared in the process of realizing the invention contains Si element, which can cause the electrical conductivity of the aluminum matrix to drop seriously, so the electrical conductivity of the material is not mentioned in the invention. At the same time, the size of cut aluminum particles less than or equal to 1mm in the invention is larger, and the mixture with graphene has little effect on improving wettability.
SUMMARY The purpose of the invention is to provide a graphene reinforced aluminum-based composite material with high conductivity and a preparation method thereof, which mainly solves the problem that the conductivity of aluminum alloy gradually decreases with the increase of strength. In order to solve the above technical problems, the invention adopts the following technical means: A preparation method of graphene reinforced aluminum matrix composite material with high conductivity is characterized by comprising the following steps: Step 1, preparing raw materials, namely drying graphene, aluminum powder and aluminum blocks in a drying box to remove moisture. Step 2, chemically plating aluminum on the surface of graphene by using an electroless plating method to obtain aluminized graphene powder. Step 3, melting the aluminum block into aluminum liquid in a crucible furnace, and introducing inert gas for protection. Step 4, heat that forming device to a temperature low than the melting point of aluminum Step 5, pouring the aluminum liquid obtained in step 3 into a mold of a forming device to form an aluminum liquid solidification layer, laying a layer of aluminized graphene powder obtained in step 2, pouring the aluminum liquid to form an aluminum liquid solidification layer, laying a layer of aluminized graphene powder obtained in step 2, and repeating the operation for many times until the forming mold is filled, wherein the last layer is an aluminum liquid solidification layer to form a sandwich sandwich structure consisting of the aluminum liquid solidification layer and the aluminized graphene powder layer. Step 6, extruding the sandwich structure obtained in step 5 into a cuboid test block by using a press. Step 7, heating the obtained cuboid test block to 500-6000 C in a heating furnace, keeping the temperature for a certain time, and carrying out forging treatment Step 8, after cooling to room temperature, longitudinally cold deform the forged cuboid test block. Step 9, annealing the deformed cuboid test block under the protection of inert gas to obtain the graphene reinforced aluminum matrix composite material with high conductivity. Preferably, in step 1, the AI% of the aluminum block and the aluminum powder is 2 99.6% (mass fraction). Preferably, in the step 2, the graphene is coarsened, sensitized and activated, and then electroless aluminized in an aluminum solution at room temperature.
Preferably, in step 3, the heating temperature of crucible furnace is 700-8000 C. Preferably, in step 3 and step 9, the inert gas is argon or helium. Preferably, in step 4, the heating temperature of the molding device is 250-3500 C. Preferably, in step 5, there should be more than or equal to 2 graphene layers in the sandwich structure, and the content of each layer should be evenly distributed according to the designed total content, but the thickness of each graphene layer should be less than 10pm and the thickness of the aluminum liquid layer should be less than 3mm during casting. Preferably, in step 7, the holding time is 25-35min, and the forging direction of forging treatment is criss-crossed. Preferably, in step 8, the deformation amount of longitudinal cold deformation of the cuboid test block is 40-60%. Preferably, in the step 9, the annealing temperature is 200-3000 C, and the furnace time is 30-60min. The invention also provides a graphene reinforced aluminum-based composite material with high conductivity, which is prepared by any one of the preparation methods mentioned above. C%(wt%) in the prepared graphene reinforced aluminum matrix composite is 1.5-2.5%, and the rest is aluminum and inevitable impurities. The tensile strength of the composite material prepared by the above process reaches 130MPa, and the electrical conductivity reaches 60%IACS. The function and control principle of each component and main process in the invention: Graphene is uniformly dispersed in the aluminum matrix to play a role of dispersion strengthening, and the dispersed particles can be used as nucleation particles to play a role of grain refinement, which can strengthen the tensile strength of the aluminum matrix without reducing its conductivity. In the present invention, the following processes are controlled: Graphene is added because it has excellent mechanical properties (Young's modulus up to 1TPa, breaking strength about 130GPa,), thermal properties (thermal conductivity about 5000W/m . K) and electrical properties (electron mobility up to 15000cm 2N . S, electrical conductivity about 108S/m).
The reason for plating aluminum powder on graphene surface by electroless plating is that, according to the principle of redox reaction, in the solution containing aluminum ions, aluminum ions can be reduced to aluminum metal by electroless plating and deposited on graphene surface to form a compact coating, which has the advantages of uniform coating, small pinhole and no need of DC power supply equipment. In addition, the chemical plating waste liquid has less discharge, less environmental pollution and lower cost. The reason why the heating temperature of the molding equipment is controlled to be 250-350 0C is to slow down the solidification and temperature drop after pouring the liquid into the mold, prevent the grain growth and provide guarantee for the subsequent extrusion molding. The reason why sandwich sandwich structure is made is to solve the problem of poor wettability between graphene and aluminum. The reason why graphene layers are controlled to be greater than or equal to 2 layers, and the thickness of each graphene layer is controlled to be less than 10pm and the thickness of aluminum liquid layer is less than 3mm during casting is to ensure full contact between graphene and aluminum matrix and provide conditions for subsequent processing. The reason why the molded sample is heated again but not melted is to fully diffuse graphene and aluminum matrix and not escape; The purpose of forging is to fully mix graphene and aluminum and refine grains. The reason why the deformation amount of rectangular block is controlled to be 40 % is that the longitudinal cold deformation can make the grain elongate longitudinally and increase dislocation defects. In the subsequent annealing process, these defects can be used as the "fast channel" of atomic diffusion to improve the conductivity and strength of the material. However, the deformation amount is too large, the dislocation density increases, the aging is unstable, and recovery and recrystallization are easy to occur, so the deformation amount is controlled to be 40-60%. The reason why the annealing temperature is controlled to be 200-3000 C is that the precipitation power is low when the temperature is less than 2000 C, and the strengthening effect is weakened when the temperature is higher than 3000 C, and the grain is easy to grow and the strength decreases.
Compare with that prior art, the invention has the following beneficial effect: According to the invention, aluminum powder is coated on the surface of graphene in an electroless plating mode, and then the problem of poor wettability of graphene and aluminum liquid is effectively improved by the combined action of subsequent heating and forging and the like, so that the graphene is uniformly added, and the graphene has high carrier mobility and bipolar electric field effect, thereby reducing the effect of insulating channels and improving the conductivity; At the same time, combined with dislocation strengthening of longitudinal cold deformation, precipitation and purification of matrix, and subsequent annealing treatment process, the performance characteristics of high conductivity of pure aluminum are maintained, and the tensile strength of aluminum matrix is effectively improved. The tensile strength of the composite material obtained by the invention reaches 130MPa, the conductivity reaches 60%IACS, and the product with conductivity close to that of pure aluminum, strength higher than that of pure aluminum and better performance is obtained.
DESCRIPTION OF THE INVENTION The invention will be described in detail below. Table 1 is a list of values of each embodiment 1-5 and comparative embodiments 1 and 2 of the present invention. Table 2 is a list of performance tests of each embodiment 1-5 of the present invention and comparative embodiments 1 and 2. The embodiments of the invention are prepared according to the following steps: 1) Drying all raw materials in a drying box for 2 hours to remove moisture, wherein the raw materials include graphene, aluminum powder and aluminum blocks. 2) After coarsening, sensitizing and activating graphene, chemical aluminizing is carried out in aluminum solution at room temperature. 3) Heating the aluminum block to melt at 750-8000 C, and introducing argon for protection. 4) Heating the forming grinding tool to 3000 C 5) Pouring a spoonful of molten aluminum into the mold to form a solidified layer of molten aluminum, then lay a layer of prepared aluminized graphene powder, pour another spoonful of molten aluminum to form a solidified layer of molten aluminum, then lay a layer of aluminized graphene powder, repeat for many times until the molding mold is filled, and the last layer is a solidified layer of molten aluminum to form a sandwich structure consisting of five solidified layers of molten aluminum and four layers of aluminized graphene powder. 6) Extruding in a cuboid grinding tool by a press to obtain a cuboid test block, and air cooling to room temperature. 7) Heating the obtained cuboid test block to 5500 C in a heating furnace, keeping the temperature for 30min, and forging for 10min. 8) Carrying out 50% longitudinal cold rolling treatment on the cuboid test block; 9) Cutting the treated sample into the required size. 10) Annealing the cut samples at 240 0C for 40min, and air cooling to room temperature to obtain the high strength, high conductivity and wear resistance aluminum matrix composite. 11) Five embodiments and one comparative embodiment of graphene reinforced aluminum matrix composites with high conductivity were prepared by selecting different material components and processes, and the proportions of each component are shown in Table 1. Table 1 Chemical composition and process of each example and comparative example of the present invention
Embodiment C/Wt% AI/wt% Graphene Forging Longitudinal layers/layer time/m formation rate/% annealing temperature/°C
1 1.50 Balance 3 15 60 200 2 1.70 Balance 4 12 56 220 3 1.90 Balance 5 9 50 250 4 2.00 Balance 3 10 45 280 5 2.50 Balance 6 8 42 300 Comparative1 0.03 Balance 0 0 60 300 Comparative2 2.00 Balance 3 0 -
Table 2 List of performance results of each example and comparative example of the present invention Embodiment strength of extension/MPa Electrical conductivity/%IACS
1 130 61 2 132 61 3 140 60 4 137 60 5 132 61 Comparative 72 62 Comparative2 89 60
It can be seen from Table 2 that the electrical conductivity of the aluminum-carbon composite materials of the five embodiments prepared by the present invention is equivalent to that of pure aluminum materials on the premise that the strength reply is improved. The above embodiments are only used to illustrate the present invention, but not to limit the present invention. Although the present invention has been described in detail with reference to examples, those of ordinary skill in the art should understand that various combinations, modifications or equivalent substitutions of the technical scheme of the present invention do not depart from the spirit and scope of the technical scheme of the present invention, and should be covered by the claims of the present invention.
Claims (10)
- THE CLAIMS DEFINING THE INVENTION ARE AS FOLLOWS: 1. Graphene reinforced aluminum matrix composite material with high conductivity and preparation method thereof is characterized in comprising the following steps: Step 1, preparing raw materials, namely drying graphene, aluminum powder and aluminum blocks in a drying box to remove moisture. Step 2, chemically plating aluminum on the surface of graphene by using an electroless plating method to obtain aluminized graphene powder. Step 3, melting the aluminum block into aluminum liquid in a crucible furnace, and introducing inert gas for protection. Step 4, heat that forming device to a temperature low than the melting point of aluminum Step 5, pouring the aluminum liquid obtained in step 3 into a mold of a forming device to form an aluminum liquid solidification layer, laying a layer of aluminized graphene powder obtained in step 2, pouring the aluminum liquid to form an aluminum liquid solidification layer, laying a layer of aluminized graphene powder obtained in step 2, and repeating the operation for many times until the forming mold is filled, wherein the last layer is an aluminum liquid solidification layer to form a sandwich sandwich structure consisting of the aluminum liquid solidification layer and the aluminized graphene powder layer. Step 6, extruding the sandwich structure obtained in step 5 into a cuboid test block by using a press. Step 7, heating the obtained cuboid test block to 500-6000 C in a heating furnace, keeping the temperature for a certain time, and carrying out forging treatment Step 8, after cooling to room temperature, longitudinally cold deform the forged cuboid test block. Step 9, annealing the deformed cuboid test block under the protection of inert gas to obtain the graphene reinforced aluminum matrix composite material with high conductivity.
- 2. The preparation method of graphene reinforced aluminum matrix composite material, according to claim 1, is characterized in that, in step 2, after the graphene is coarsened, sensitized and activated, the graphene is chemically plated with aluminum in an aluminum solution at room temperature.
- 3. The preparation method of graphene reinforced aluminum matrix composite, according to claim 1, is characterized in that in step 3, the heating temperature of crucible furnace is 700-800°C.
- 4. The preparation method of graphene reinforced aluminum matrix composite, according to claim 1, is characterzied in wherein the inert gas in step 3 and step 9 is argon or helium.
- 5. The preparation method of graphene reinforced aluminum matrix composite according to claim 1, characterized in that in step 4, the heating temperature of the forming device is 250-350°C.
- 6. The preparation method of graphene reinforced aluminum matrix composite, according to claim 1, is characterized in that in step 5, there should be more than or equal to two graphene layers in the sandwich structure, and the content of each layer should be evenly distributed according to the designed total content, but the thickness of each graphene layer should be less than 10. m u.m and the thickness of the solidified layer of molten aluminum should be less than 3mm during casting.
- 7. The preparation method of graphene reinforced aluminum matrix composite according to claim 1, is characterized in that in step 7, the holding time is 25-35min, and the forging directions of forging treatment are criss-crossed.
- 8. The preparation method of graphene reinforced aluminum matrix composite according to claim 1, is characterized in that, in step 8, the deformation amount of longitudinal cold deformation of the rectangular block is 40-60%.
- 9. The preparation method of graphene reinforced aluminum matrix composite according to claim 1, characterized in that in step 8, in step 9, the annealing temperature is 200-300°C and the furnace time is 30-60min.
- 10. Graphene reinforced aluminum matrix composite material with high conductivity, which is characterized by being prepared by the preparation method according to any one of claims 1-9.
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| CN115216663A (en) * | 2022-07-20 | 2022-10-21 | 山东省科学院新材料研究所 | Heterogeneous high-toughness graphene reinforced aluminum-based composite material and preparation method thereof |
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| CN115216663A (en) * | 2022-07-20 | 2022-10-21 | 山东省科学院新材料研究所 | Heterogeneous high-toughness graphene reinforced aluminum-based composite material and preparation method thereof |
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