CN113584352A - Preparation method of aluminum-based composite material - Google Patents
Preparation method of aluminum-based composite material Download PDFInfo
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- CN113584352A CN113584352A CN202110743880.1A CN202110743880A CN113584352A CN 113584352 A CN113584352 A CN 113584352A CN 202110743880 A CN202110743880 A CN 202110743880A CN 113584352 A CN113584352 A CN 113584352A
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/12—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/24—Preliminary treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/26—Auxiliary equipment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/0012—Mechanical treatment, e.g. roughening, deforming, stretching
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/0036—Heat treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/16—Drying; Softening; Cleaning
- B32B38/162—Cleaning
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B2038/0052—Other operations not otherwise provided for
- B32B2038/0064—Smoothing, polishing, making a glossy surface
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Abstract
The invention discloses a preparation method of an aluminum matrix composite, which comprises the following steps: (1) laying carbon nano tubes and nano silicon carbide powder between aluminum plates; (2) and welding the aluminum plate by friction stir welding to obtain the carbon nano tube and nano silicon carbide reinforced aluminum matrix composite. The carbon nano tube and the nano silicon carbide in the binary hybrid reinforced aluminum matrix composite material prepared by the invention has good structural integrity, the carbon nano tube and the nano silicon carbide are fully and uniformly dispersed in an aluminum matrix, and the whole process has the advantages of short process flow, low cost, high efficiency and high strength, and is suitable for preparing larger plates and large-scale production.
Description
Technical Field
The invention relates to a preparation method of an aluminum-based composite material, belonging to the field of preparation of composite materials.
Background
Since twenty-first century, with the rapid development of the navigation industry in China, the lightweight of a delivery vehicle has become a research hotspot at present. The aluminum alloy has high specific strength, good toughness and fatigue performance, and is widely applied to the fields of aerospace, aviation, automobiles, mechanical manufacturing, ships, chemical industry and the like. The particle reinforced aluminum-based composite material prepared by adding the reinforcing phase particles into the aluminum matrix has the characteristics of good strength, toughness, easy formability and the like of aluminum alloy, has the advantages of high strength, high modulus and the like of the particles, and is a metal-based composite material which is most widely applied in recent years.
The carbon nano tube has extremely high strength, the average Young modulus is 1-1.8 TPa, the average Young modulus is about 100 times that of steel, the interlaminar shear strength can reach 500MPa, and the density of the carbon nano tube is only 1/6 of steel. The carbon nano tube is ideal reinforced aluminum matrix composite material reinforced particles due to extremely high specific strength and specific stiffness, extremely low density and special electric and thermal conductivity. However, the carbon nanotubes have a very large specific surface area, which is very likely to cause an agglomeration phenomenon.
The nano silicon carbide has the excellent performances of high surface activity, light weight, good toughness, high strength, high hardness, high temperature resistance and the like, is widely applied to the fields of aerospace, national defense equipment and the like, and is also widely applied to the fields of machinery, chemical industry, electronic industry and the like. However, the bonding with the metal substrate has a large interfacial stress and cannot be performed well.
The unique multidimensional nano structure of the carbon nano tube can be matched with the silicon carbide structure on the aluminum matrix to form good interface combination, and the high-performance fiber-reinforced and particle-reinforced carbon nano tube and nano silicon carbide binary hybrid reinforced aluminum matrix composite material with high strength, impact resistance and high temperature resistance is expected to be obtained.
According to the current research, the methods for preparing the aluminum matrix composite material mainly comprise a casting method, a spray deposition method and a powder metallurgy method. However, interfacial reaction occurs between the matrix material and the reinforcing particles prepared by the casting method; the equipment and the process of the jet deposition method are complex, the difficulty in preparing the composite material is high, and the porosity is high; powder metallurgy manufacturing is limited in size and shape and expensive to produce. Friction stir welding is a novel solid phase connection means, and is widely accepted because it is green and environment-friendly and can simultaneously realize the refinement, densification and homogenization of the microstructure of the material.
In the invention patent with the publication number of CN 101864547A, carbon nano tube and aluminum composite powder are prepared by an impregnation method; then the evenly dispersed carbon nano tube reinforced aluminum matrix composite block is prepared by cold pressing, sintering and hot extrusion. However, the surface structure of the carbon nanotube is seriously damaged due to the long acidification time in the impregnation process, which is not favorable for the performance of the carbon nanotube.
The invention patent with publication number CN 105734459A adopts powder hot extrusion molding process: ball-milling the carbon nano tube and the aluminum powder to prepare composite powder, packaging the composite powder in a sheathing material, sintering and extruding the composite powder, and stripping the sheathing material to obtain a target product. However, this process causes the carbon nanotubes to agglomerate and not be uniformly dispersed in the composite material, which also reduces the performance of the composite material.
The invention patent with publication number CN 103343265A prepares a graphite/silicon hybrid reinforced high-heat-conductivity low-expansion aluminum-based composite material, which is prepared by a pressure infiltration method and consists of matrix aluminum, graphite and silicon, and a harmful interface reactant A1 for inhibiting graphite aluminum is added4C3The resulting interface modifying additive. The preparation method has the advantages of low efficiency, long production period, high manufacturing cost and high requirement on equipment, so that the industrial large-scale production is difficult to carry out.
In the invention patent with publication number CN 103586654a, an organic solvent slurry in which silicon carbide particles and boron carbide particles are dispersed is uniformly coated on the surface of a clean aluminum plate by friction stir welding to prepare a surface aluminum-based composite material. The process can cause the agglomeration of silicon carbide particles and boron carbide particles, and the silicon carbide particles and the boron carbide particles cannot be uniformly distributed in an aluminum base, and the loss of the silicon carbide particles and the boron carbide particles is serious, so that the addition amounts of the silicon carbide particles and the boron carbide particles cannot be effectively calculated, and the performance of the composite material is correspondingly influenced.
Disclosure of Invention
The invention aims to solve the technical problems that in the prior art, the preparation of the aluminum matrix composite material has the technical problems of high cost, poor reinforcing effect, weak interface bonding and the like.
In order to solve the technical problem, the invention provides a preparation method of an aluminum matrix composite, which comprises the following steps:
(1) laying carbon nano tubes and nano silicon carbide powder between aluminum plates;
(2) and welding the aluminum plate by friction stir welding to obtain the carbon nano tube and nano silicon carbide reinforced aluminum matrix composite.
Preferably, in the step (1), three aluminum plates, namely, a first aluminum plate, a second aluminum plate and a third aluminum plate, are prepared, the three aluminum plates are sequentially stacked, and the carbon nanotubes and the nano silicon carbide powder are laid between the first aluminum plate and the second aluminum plate and between the second aluminum plate and the third aluminum plate. It should be noted that the carbon nanotubes and the nano silicon carbide powder can be mixed and then laid between the first aluminum plate and the second aluminum plate, and between the second aluminum plate and the third aluminum plate; meanwhile, the carbon nano tubes and the nano silicon carbide powder can be respectively paved between the first aluminum plate and the second aluminum plate and between the second aluminum plate and the third aluminum plate, namely the carbon nano tubes are paved on one side of the second aluminum plate, and the nano silicon carbide powder is paved on the other side of the second aluminum plate.
Preferably, the thickness of the first aluminum plate is 2.5-3.5 mm; the thickness of the second aluminum plate is 1.0-2.0 mm; the thickness of the third aluminum plate is 2.5-3.5 mm.
Preferably, the carbon nanotube powder has an outer diameter of 3 to 15nm and a length of 3 to 12 μm, and the nano silicon carbide powder has a diameter of 20 to 100 nm.
Preferably, the mass ratio of the carbon nanotubes to the nano silicon carbide is 1: 20 to 80 parts.
Preferably, the carbon nanotubes: nano silicon carbide: the mass ratio of the aluminum plate is 1: 20-80: 1000 to 2000.
Preferably, the aluminum plate is provided with grooves for laying the carbon nanotubes and the nano silicon carbide powder.
Preferably, the parameters of the friction stir welding are: the rotating speed of the stirring head is 10-2000 r/min, the welding speed is 10-200 mm/min, the axial pressing amount is 0-0.5 mm, and the inclination angle of the stirring head is 1-5 degrees.
Preferably, the carbon nanotubes and the nano silicon carbide powder are mixed, ball-milled, sieved and laid between aluminum plates.
Preferably, the friction stir welded material is subjected to solution treatment and artificial aging treatment.
Preferably, the conditions of the solution treatment are: the temperature is 460-499 ℃, and the heat preservation time is 20-50 min; the treatment conditions of artificial aging are as follows: the temperature is 116-127 ℃, and the heat preservation time is 20-25 h.
Preferably, the solution treatment is followed by water quenching and then artificial aging.
The aluminum plate of the invention is a pure aluminum plate or an aluminum alloy plate.
Taking three layers of aluminum plates as an example, the specific technical scheme of the invention is implemented according to the following steps:
s1, putting the carbon nano tube and the nano silicon carbide into a ball milling tank, and putting the ball milling tank and the nano silicon carbide into a ball mill for uniform ball milling;
s2, preparing three aluminum plates, namely a first aluminum plate, a second aluminum plate and a third aluminum plate, and performing pretreatment (grooving);
s3, sieving the powder ball-milled in the step S1 by a 200-mesh sieve, flatly paving the ball-milled powder between a second aluminum plate and a third aluminum plate, and stacking the second aluminum plate on the third aluminum plate after the powder is paved; the ball-milled powder is spread between the first aluminum plate and the second aluminum plate, and the first aluminum plate is stacked on the second aluminum plate after the powder is spread;
s4, performing friction stir welding treatment on the first aluminum plate in the step S3 for multiple times by using friction stir welding to obtain a preliminary aluminum-based composite material with compact crystal grains and mixed with the carbon nano tube and the nano silicon carbide binary mixed phase;
s5, carrying out solid solution treatment and artificial aging on the aluminum matrix composite obtained in the step S4 to obtain a carbon nano tube and nano silicon carbide binary hybrid reinforced aluminum matrix composite finished product.
The aluminum plate disclosed by the invention can be suitable for aluminum plates with different sizes, wherein the aluminum plate is preferably square, for example, the length is 2000-3000 mm, and the width is 1100-1800 mm. Typically three aluminum panels stacked together are the same size.
In order to mix the carbon nanotubes and the nano silicon carbide powder more uniformly, the ball milling time can be adjusted according to the initial sizes of the carbon nanotubes and the nano silicon carbide powder, for example, the ball milling time can be prolonged to 6 hours.
Similarly, the welding parameters can be properly adjusted, and when the welding rotating speed is 2000r/min, the obtained aluminum matrix composite material still has good performance.
The invention has the following beneficial effects: according to the invention, the carbon nano tube and the nano silicon carbide are fully dispersed in the aluminum matrix through friction stir welding, and the enhanced phase particles are uniformly distributed in the matrix through the stirring action of the stirring needle, so that the high-density composite material is prepared. The carbon nano tube in the prepared binary hybrid reinforced aluminum matrix composite material of the carbon nano tube and the nano silicon carbide has good structural integrity, the carbon nano tube and the nano silicon carbide are fully and uniformly dispersed in an aluminum matrix, the whole process has short process flow, lower cost and higher efficiency, and larger plates and gradient materials can be prepared, so that the binary hybrid reinforced aluminum matrix composite material is suitable for large-scale production.
Drawings
FIG. 1 is a flow chart of an embodiment of the present invention;
FIG. 2 is a non-uniform distribution pattern of four types of reinforcement members.
Detailed Description
Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in order to provide a more clear illustration and understanding of the technology.
Example one
The embodiment provides a preparation method of a carbon nanotube and nano silicon carbide binary hybrid reinforced aluminum matrix composite, the process flow of which is shown in fig. 1, and the preparation method specifically comprises the following steps:
1. ball-milled carbon nanotube and nano silicon carbide powder
Uniformly mixing carbon nanotubes and nano silicon carbide powder, wherein the ball milling time is 2 hours, the reinforcing phase comprises the carbon nanotubes and the nano silicon carbide, the outer diameter of each carbon nanotube is 8-10 nm, the length of each carbon nanotube is 6-10 mu m, and the carbon nanotubes: nano silicon carbide: the mass ratio of the three aluminum plates is 1: 40: 2500;
2. preparation before welding
Preparing three aluminum plates, polishing a surface oxidation layer near a welding seam of the aluminum plate to be welded by using abrasive paper, wherein the polishing aims at removing a compact oxidation film which is easily formed on the aluminum plate in the air, cleaning the surface by using absolute ethyl alcohol after polishing, cleaning the surface by using acetone and removing surface grease, and grooving a second aluminum plate, wherein the groove is in a pattern shown in (a) in figure 2 (in figure 2, a space enclosed by dotted lines is a groove, a carbon nano tube and nano silicon carbide powder are filled in the groove), the second aluminum plate is stacked on a third aluminum plate, the first aluminum plate is stacked on the second aluminum plate, the three aluminum plates are made of 7075 high-strength aluminum alloy, the thickness of each of the first aluminum plate and the third aluminum plate is 3mm, and the thickness of the second aluminum plate is 1.5 mm; the length of each of the three aluminum plates is 2800mm, and the width of each of the three aluminum plates is 1200mm, so that the three aluminum plates can be placed on a friction stir welding working platform conveniently;
3. performing friction stir welding
Placing the two 7075 high-strength aluminum alloys on a workbench for friction stir welding, and then performing 3 times of friction stir welding on the middle position of the front surface of the first aluminum plate, wherein the rotating speed of a stirring head is respectively selected as technological parameters to be 1500r/min, the welding speed is 50mm/min, the axial pressing amount is 0.1mm, and the inclination angle of the stirring head is 3 degrees;
4. carrying out solid solution treatment and artificial aging
Putting the preliminary aluminum matrix composite material obtained in the step S3 into a resistance furnace for the last step of solution treatment and artificial aging, wherein the heating temperature is 475 ℃, and the heat preservation time is 30 min; and then taking out the aluminum-based composite material for water cooling, and then putting the aluminum-based composite material into an aging furnace, wherein the artificial aging temperature is 120 ℃, and the heat preservation time is 24 hours, so that a carbon nano tube and nano silicon carbide binary hybrid reinforced aluminum-based composite material finished product can be obtained, and the tensile strength of the aluminum-based composite material is shown in table 1.
Example two
The specific method is the same as the first embodiment, and the only different process conditions are that the carbon nano tube: nano silicon carbide: the mass ratio of the three aluminum plates is 1: 40: 1250, the tensile strength of the binary hybrid reinforced aluminum matrix composite material of carbon nanotube and nano silicon carbide finally obtained in this example is shown in table 1.
EXAMPLE III
The specific method is the same as the first embodiment, and the only different process conditions are as follows: this example has only upper and lower two aluminum plates (first aluminum plate + third aluminum plate), carbon nanotubes: nano silicon carbide: the mass ratio of the two aluminum plates is 1: 40: 4000, the tensile strength of the carbon nanotube and nano silicon carbide binary hybrid reinforced aluminum matrix composite finally obtained in the embodiment is shown in table 1.
Example four
The specific method is the same as the first embodiment, and the only different process conditions are as follows: the powder is distributed on the plate, the carbon nanotube powder after ball milling is tiled between the second aluminum plate and the third aluminum plate, and the nano silicon carbide powder after ball milling is tiled between the first aluminum plate and the second aluminum plate; the carbon nanotube and nano silicon carbide binary hybrid reinforced aluminum matrix composite finally obtained in the embodiment has large improvement amplitude of yield strength and tensile strength, small reduction amplitude of plasticity and excellent comprehensive mechanical property, and the tensile strength of the carbon nanotube and nano silicon carbide binary hybrid reinforced aluminum matrix composite finally obtained in the embodiment is shown in table 1.
EXAMPLE five
The specific method is the same as the third embodiment, and the only different process conditions are as follows: carbon nanotube: nano silicon carbide: the mass ratio of the two aluminum plates is 0.5: 40: 4000, the tensile strength of the carbon nanotube and nano silicon carbide binary hybrid reinforced aluminum matrix composite finally obtained in the embodiment is shown in table 1.
EXAMPLE six
The specific method is the same as the third embodiment, and the only different process conditions are as follows: carbon nanotube: nano silicon carbide: the mass ratio of the two aluminum plates is 2: 40: 4000, the tensile strength of the carbon nanotube and nano silicon carbide binary hybrid reinforced aluminum matrix composite finally obtained in the embodiment is shown in table 1.
EXAMPLE seven
The specific method is the same as the third embodiment, and the only different process conditions are as follows: carbon nanotube: nano silicon carbide: the mass ratio of the two aluminum plates is 3: 40: 4000, the tensile strength of the carbon nanotube and nano silicon carbide binary hybrid reinforced aluminum matrix composite finally obtained in the embodiment is shown in table 1.
Example eight
The specific method is the same as the first embodiment, and the only different process conditions are as follows: the powder is non-uniformly distributed and locally enriched on the plate, and the distribution mode is shown as b), c) and d) in figure 2; the embodiment can also obtain the finally obtained carbon nano tube and nano silicon carbide binary hybrid reinforced aluminum matrix composite material, and can obtain a gradient material with uniform particles and excellent comprehensive mechanical properties.
Comparative example 1
The specific method is the same as the third embodiment, and the only different process conditions are as follows: the carbon nanotubes and the nano silicon carbide are replaced by the same weight of carbon nanotubes. The tensile strength of the carbon nanotube-reinforced aluminum matrix composite finally obtained in this example is shown in table 1.
Comparative example No. two
The specific method is the same as the third embodiment, and the only different process conditions are as follows: the carbon nano tube and the nano silicon carbide are replaced by nano silicon carbide with the same weight. The tensile strength of the nano silicon carbide reinforced aluminum matrix composite finally obtained in the example is shown in table 1.
Table 1: conditions and Properties of examples
The carbon nano tube and the nano silicon carbide in the binary hybrid reinforced aluminum matrix composite material prepared by the invention has good structural integrity, the carbon nano tube and the nano silicon carbide are fully and uniformly dispersed in an aluminum matrix, and the whole process has the advantages of short process flow, low cost, high efficiency and high strength, and is suitable for preparing larger plates and large-scale production.
The foregoing is illustrative of the preferred embodiments of the present invention and is not exhaustive or limited to the embodiments shown. All equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the protection scope of the present invention.
Claims (10)
1. The preparation method of the aluminum matrix composite is characterized by comprising the following steps:
(1) laying carbon nano tubes and nano silicon carbide powder between aluminum plates;
(2) and welding the aluminum plate by friction stir welding to obtain the carbon nano tube and nano silicon carbide reinforced aluminum matrix composite.
2. The manufacturing method according to claim 1, wherein in the step (1), three aluminum plates, which are a first aluminum plate, a second aluminum plate, and a third aluminum plate, are prepared, the three aluminum plates are sequentially stacked, and the carbon nanotubes and the nano silicon carbide powder are laid between the first aluminum plate and the second aluminum plate, and between the second aluminum plate and the third aluminum plate.
3. The method according to claim 2, wherein the first aluminum plate has a thickness of 2.5 to 3.5 mm; the thickness of the second aluminum plate is 1.0-2.0 mm; the thickness of the third aluminum plate is 2.5-3.5 mm.
4. The method according to claim 1, wherein the carbon nanotube powder has an outer diameter of 3 to 15nm and a length of 3 to 12 μm, and the nano silicon carbide powder has a diameter of 20 to 100 nm.
5. The preparation method according to claim 1, wherein the mass ratio of the carbon nanotubes to the nano silicon carbide is 1: 20 to 80 parts.
6. The method of claim 1, wherein the aluminum plate is provided with grooves for laying the carbon nanotubes and the nano silicon carbide powder.
7. The method of manufacturing according to claim 1, wherein the parameters of the friction stir welding are: the rotating speed of the stirring head is 10-2000 r/min, the welding speed is 10-200 mm/min, the axial pressing amount is 0-0.5 mm, and the inclination angle of the stirring head is 1-5 degrees.
8. The method according to claim 1, wherein the carbon nanotubes and the nano silicon carbide powder are mixed, ball-milled, sieved, and then laid between aluminum plates.
9. The method according to claim 1, wherein the friction stir welded material is subjected to solution treatment and artificial aging treatment.
10. The production method according to claim 9, characterized in that the conditions of the solution treatment are: the temperature is 460-499 ℃, and the heat preservation time is 20-50 min; the treatment conditions of artificial aging are as follows: the temperature is 116-127 ℃, and the heat preservation time is 20-25 h.
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Application publication date: 20211102 |